{
  "spore": "profile",
  "id": "epo-tek-301-2",
  "spore_version": "0.2",
  "family": "optical-epoxy",
  "name": "EPO-TEK 301-2 optically transparent epoxy",
  "abbreviation": "301-2",
  "role": "Two-part optically transparent epoxy for bonding, sealing and encapsulating optics, fibres and chips",
  "category": "seals-adhesives",
  "type": "adhesives",
  "summary": "EPO-TEK 301-2 is a two-part, optically transparent epoxy made by Epoxy Technology. Its current datasheet (Rev. XVIII) gives a viscosity of 225 - 425 cPs at 23 °C and a refractive index of 1.5318 at 589 nm. NASA RP-1124 lists it with a total mass loss of 2.62 % and a collected volatile condensable material value of 1.03 %.",
  "best_for": "Bonding, sealing and encapsulating optics and chips where light must pass through the joint: at least 99 % transmission from 400 to 1,200 nm per the current datasheet.",
  "weakest_at": "Outgassing and heat: NASA RP-1124 records a CVCM of 1.03 %, and the datasheet shows 2.19 % weight loss at 300 °C.",
  "identity": {
    "formula": "Two-part epoxy. Part A is bisphenol A diglycidyl ether resin (CAS 1675-54-3), at least 60 % of Part A by weight. Part B is polyoxypropylenediamine (CAS 9046-10-0), at least 60 % of Part B by weight. Mixed 100 : 35 by weight (Part A : Part B), per the Part A and Part B SDS and the datasheet header.",
    "designations": [
      {
        "system": "Trade name",
        "code": "EPO-TEK® 301-2",
        "source": "tds-2021",
        "where": "Title block"
      }
    ],
    "source": "epotek-sds-partA",
    "where": "Section 3.2 (Part A composition); Part B SDS Section 3.2; mix ratio in the datasheet header table"
  },
  "tags": {
    "environments": [],
    "stresses": [
      "uv",
      "vacuum-and-outgassing"
    ],
    "applications": [
      "electronics-and-chips",
      "optics-and-cameras"
    ]
  },
  "properties": [
    {
      "benchmark": "viscosity",
      "label": "Viscosity at 23 °C, 100 rpm, before cure",
      "value": 225,
      "value_high": 425,
      "bound": "range",
      "unit": "cPs",
      "scope": "material",
      "conditions": {
        "speed": "100 rpm",
        "temperature": "23 °C",
        "state": "before cure"
      },
      "method": "Printed as 225 - 425 cPs; the datasheet marks the test with an asterisk as a lot acceptance test",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Viscosity (23°C) @ 100 rpm row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "glass_transition_temperature",
      "label": "Glass transition temperature, dynamic test",
      "value": 80,
      "bound": "lower",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "method_as_printed": "Dynamic cure 20 to 200 °C, ISO 25 min; ramp -10 to 200 °C at 20 °C/min",
        "cure": "80 °C / 3 Hours"
      },
      "method": "Printed as ≥ 80 °C; the datasheet marks the test as a lot acceptance test",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Glass Transition Temp. row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "shore_d_hardness",
      "label": "Shore D hardness",
      "value": 80,
      "bound": "exact",
      "unit": "Shore D",
      "scope": "material",
      "conditions": {
        "cure": "80 °C / 3 Hours"
      },
      "method": "Printed as 80 in the Shore D Hardness row; test standard not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Shore D Hardness row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "lap_shear_strength",
      "label": "Lap shear strength at 23 °C",
      "value": 2000,
      "bound": "lower",
      "unit": "psi",
      "scope": "material",
      "conditions": {
        "temperature": "23 °C",
        "cure": "80 °C / 3 Hours"
      },
      "method": "Printed as > 2,000 psi; test standard not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Lap Shear @ 23°C row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "die_shear_strength",
      "label": "Die shear strength at 23 °C, current datasheet (psi)",
      "value": 5334,
      "bound": "lower",
      "unit": "psi",
      "scope": "material",
      "conditions": {
        "temperature": "23 °C",
        "revision": "Rev. XVIII, February 2021"
      },
      "method": "Printed as ≥ 15 Kg 5,334 psi in the current datasheet",
      "status": "ground",
      "note": "The older Rev. X copy prints 5,100 psi for the same test. The two revisions disagree and the datasheets give no reason.",
      "source": "tds-2021",
      "where": "Physical Properties, Die Shear @ 23°C row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "die_shear_strength",
      "label": "Die shear strength at 23 °C, current datasheet (kg)",
      "value": 15,
      "bound": "lower",
      "unit": "kg",
      "scope": "material",
      "conditions": {
        "temperature": "23 °C",
        "revision": "Rev. XVIII, February 2021"
      },
      "method": "Printed as ≥ 15 Kg in the same row as the psi figure",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Die Shear @ 23°C row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "degradation_temperature",
      "label": "Degradation temperature",
      "value": 360,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "method_as_printed": "not printed in the current datasheet"
      },
      "method": "Printed as Degradation Temp 360 °C; the current datasheet does not name the test method",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Degradation Temp row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "weight_loss",
      "label": "Weight loss at 200 °C",
      "value": 0.01,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "temperature": "200 °C",
        "hold_time": "not printed"
      },
      "method": "Printed as 0.01 % weight loss at 200 °C; hold time and atmosphere not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Weight Loss, @ 200°C row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "weight_loss",
      "label": "Weight loss at 250 °C",
      "value": 0.46,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "temperature": "250 °C",
        "hold_time": "not printed"
      },
      "method": "Printed as 0.46 % weight loss at 250 °C; hold time and atmosphere not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Weight Loss, @ 250°C row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "weight_loss",
      "label": "Weight loss at 300 °C",
      "value": 2.19,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "temperature": "300 °C",
        "hold_time": "not printed"
      },
      "method": "Printed as 2.19 % weight loss at 300 °C; hold time and atmosphere not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Weight Loss, @ 300°C row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "max_service_temp",
      "label": "Suggested operating temperature, intermittent",
      "value": 300,
      "bound": "upper",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "use": "intermittent"
      },
      "method": "Printed as < 300 °C (Intermittent); the datasheet says the data are a guide and not a specification",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Suggested Operating Temperature row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "storage_modulus",
      "label": "Storage modulus, current datasheet",
      "value": 432279,
      "bound": "exact",
      "unit": "psi",
      "scope": "material",
      "conditions": {
        "temperature": "not printed"
      },
      "method": "Printed as 432,279 psi; a dynamic storage modulus, not the elastic modulus; test temperature not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Storage Modulus row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "chloride_ion_content",
      "label": "Chloride ion content",
      "value": 61,
      "bound": "exact",
      "unit": "ppm",
      "scope": "material",
      "conditions": {
        "basis": "as printed; test method and cure state not stated"
      },
      "method": "Printed in the Ion Content row as Cl- 61 ppm; test method not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Ion Content, Cl- row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "sodium_ion_content",
      "label": "Sodium ion content",
      "value": 104,
      "bound": "exact",
      "unit": "ppm",
      "scope": "material",
      "conditions": {
        "basis": "as printed; test method and cure state not stated"
      },
      "method": "Printed in the Ion Content row as Na+ 104 ppm; test method not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Physical Properties, Ion Content, Na+ row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "dielectric_constant",
      "label": "Dielectric constant",
      "value": 3.8,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "frequency": "1 kHz"
      },
      "method": "Printed as 3.80 at 1KHz",
      "status": "ground",
      "source": "tds-2021",
      "where": "Electrical and Thermal Properties, Dielectric Constant row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "dissipation_factor",
      "label": "Dissipation factor",
      "value": 0.012,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "frequency": "1 kHz"
      },
      "method": "Printed as 0.012 at 1KHz",
      "status": "ground",
      "source": "tds-2021",
      "where": "Electrical and Thermal Properties, Dissipation Factor row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "refractive_index",
      "label": "Refractive index at 589 nm",
      "value": 1.5318,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "wavelength": "589 nm",
        "temperature": "23 °C"
      },
      "method": "Printed as 1.5318 @ 589 nm under Optical Properties @ 23°C",
      "status": "ground",
      "source": "tds-2021",
      "where": "Optical Properties @ 23°C, Refractive Index row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "spectral_transmission",
      "label": "Spectral transmission at 320 nm",
      "value": 94,
      "bound": "lower",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "wavelength": "320 nm",
        "temperature": "23 °C"
      },
      "method": "Printed as ≥ 94% @ 320 nm",
      "status": "ground",
      "source": "tds-2021",
      "where": "Optical Properties @ 23°C, Spectral Transmission row, first line",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "spectral_transmission",
      "label": "Spectral transmission, 400 to 1,200 nm",
      "value": 99,
      "bound": "lower",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "wavelength": "400 to 1,200 nm",
        "temperature": "23 °C"
      },
      "method": "Printed as ≥ 99% @ 400-1,200 nm",
      "status": "ground",
      "source": "tds-2021",
      "where": "Optical Properties @ 23°C, Spectral Transmission row, second line",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "spectral_transmission",
      "label": "Spectral transmission, 1,200 to 1,600 nm",
      "value": 98,
      "bound": "lower",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "wavelength": "1,200 to 1,600 nm",
        "temperature": "23 °C"
      },
      "method": "Printed as ≥ 98% @ 1,200-1,600 nm",
      "status": "ground",
      "source": "tds-2021",
      "where": "Optical Properties @ 23°C, Spectral Transmission row, third line",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "pot_life",
      "label": "Pot life after mixing",
      "value": 8,
      "bound": "exact",
      "unit": "hours",
      "scope": "material",
      "conditions": {
        "mix": "100 : 35 by weight",
        "temperature": "not printed"
      },
      "method": "Printed as 8 Hours in the header table",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Pot Life row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "specific_gravity",
      "label": "Specific gravity, Part A",
      "value": 1.15,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "part": "Part A",
        "temperature": "not printed"
      },
      "method": "Printed in the header table; temperature not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Specific Gravity, Part A row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "specific_gravity",
      "label": "Specific gravity, Part B",
      "value": 0.95,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "part": "Part B",
        "temperature": "not printed"
      },
      "method": "Printed in the header table; temperature not printed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Specific Gravity, Part B row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "mix_ratio",
      "label": "Mix ratio, Part B parts per 100 parts Part A, by weight",
      "value": 35,
      "bound": "exact",
      "unit": "parts Part B per 100 parts Part A by weight",
      "scope": "material",
      "conditions": {
        "basis": "printed as 100 : 35 by weight"
      },
      "method": "Printed in the header table as Mix Ratio by Weight 100 : 35; the value recorded is the Part B figure",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Mix Ratio by Weight row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "shelf_life",
      "label": "Shelf life, bulk product",
      "value": 1,
      "bound": "exact",
      "unit": "year",
      "scope": "material",
      "conditions": {
        "product": "bulk",
        "storage": "room temperature"
      },
      "method": "Printed in words as One year at room temperature",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Shelf Life Bulk row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "shelf_life",
      "label": "Shelf life, syringe",
      "value": 6,
      "bound": "exact",
      "unit": "months",
      "scope": "material",
      "conditions": {
        "product": "single-component syringe",
        "storage": "-40 °C"
      },
      "method": "Printed in words as Six months at -40°C",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Shelf Life Syringe row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "cure_temperature",
      "label": "Recommended cure temperature",
      "value": 80,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "time": "3 hours"
      },
      "method": "Printed as Recommended Cure 80°C / 3 Hours",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Recommended Cure row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "cure_time",
      "label": "Recommended cure time",
      "value": 3,
      "bound": "exact",
      "unit": "hours",
      "scope": "material",
      "conditions": {
        "temperature": "80 °C"
      },
      "method": "Printed as Recommended Cure 80°C / 3 Hours",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Recommended Cure row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "minimum_alternative_cure_time",
      "label": "Minimum alternative cure time",
      "value": 48,
      "bound": "exact",
      "unit": "hours",
      "scope": "material",
      "conditions": {
        "temperature": "23 °C"
      },
      "method": "Printed as 23°C / 48 Hours; the datasheet says this minimum alternative cure may not achieve the performance properties listed",
      "status": "ground",
      "source": "tds-2021",
      "where": "Header table, Minimum Alternative Cure(s) row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
        "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
        "year": 2021,
        "kind": "datasheet",
        "license": "manufacturer datasheet, cited not reproduced"
      }
    },
    {
      "benchmark": "storage_modulus",
      "label": "Storage modulus, older copy (Rev. X)",
      "value": 298719,
      "bound": "exact",
      "unit": "psi",
      "scope": "material",
      "conditions": {
        "temperature": "not printed",
        "revision": "Rev. X, April 2010"
      },
      "method": "Printed as 298,719 psi in the older copy; a dynamic storage modulus; test temperature not printed",
      "status": "ground",
      "note": "The current datasheet prints 432,279 psi. The two revisions disagree and the datasheets give no reason.",
      "source": "tds-2010",
      "where": "Typical Properties, Storage Modulus row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. X, April 2010 (copy)",
        "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
        "year": 2010,
        "kind": "datasheet",
        "license": "manufacturer datasheet copy, cited not reproduced"
      }
    },
    {
      "benchmark": "die_shear_strength",
      "label": "Die shear strength at 23 °C, older copy (Rev. X)",
      "value": 5100,
      "bound": "lower",
      "unit": "psi",
      "scope": "material",
      "conditions": {
        "temperature": "23 °C",
        "revision": "Rev. X, April 2010"
      },
      "method": "Printed as ≥ 15 Kg / 5,100 psi in the older copy",
      "status": "ground",
      "note": "The current datasheet prints 5,334 psi. The two revisions disagree and the datasheets give no reason.",
      "source": "tds-2010",
      "where": "Typical Properties, Die Shear Strength @ 23°C row",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. X, April 2010 (copy)",
        "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
        "year": 2010,
        "kind": "datasheet",
        "license": "manufacturer datasheet copy, cited not reproduced"
      }
    },
    {
      "benchmark": "specific_gravity",
      "label": "Specific gravity, Part A, older copy (Rev. X)",
      "value": 1.02,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "part": "Part A",
        "revision": "Rev. X, April 2010"
      },
      "method": "Printed as Part A 1.02 in the older copy; temperature not printed",
      "status": "ground",
      "note": "The current datasheet prints 1.15 for Part A.",
      "source": "tds-2010",
      "where": "Specific Gravity row, Part A",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. X, April 2010 (copy)",
        "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
        "year": 2010,
        "kind": "datasheet",
        "license": "manufacturer datasheet copy, cited not reproduced"
      }
    },
    {
      "benchmark": "specific_gravity",
      "label": "Specific gravity, Part B, older copy (Rev. X)",
      "value": 0.89,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "part": "Part B",
        "revision": "Rev. X, April 2010"
      },
      "method": "Printed as Part B 0.89 in the older copy; temperature not printed",
      "status": "ground",
      "note": "The current datasheet prints 0.95 for Part B.",
      "source": "tds-2010",
      "where": "Specific Gravity row, Part B",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. X, April 2010 (copy)",
        "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
        "year": 2010,
        "kind": "datasheet",
        "license": "manufacturer datasheet copy, cited not reproduced"
      }
    },
    {
      "benchmark": "max_service_temp",
      "label": "Operating temperature, continuous, older copy (Rev. X)",
      "value": 200,
      "bound": "upper",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "use": "continuous",
        "revision": "Rev. X, April 2010"
      },
      "method": "Printed as Continuous - 55°C to 200°C in the older copy; the current datasheet prints no continuous limit",
      "status": "ground",
      "source": "tds-2010",
      "where": "Operating Temperature rows, Continuous line",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. X, April 2010 (copy)",
        "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
        "year": 2010,
        "kind": "datasheet",
        "license": "manufacturer datasheet copy, cited not reproduced"
      }
    },
    {
      "benchmark": "min_service_temp",
      "label": "Minimum operating temperature, older copy (Rev. X)",
      "value": -55,
      "bound": "lower",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "use": "continuous and intermittent",
        "revision": "Rev. X, April 2010"
      },
      "method": "Printed as - 55°C for continuous and intermittent operation in the older copy",
      "status": "ground",
      "source": "tds-2010",
      "where": "Operating Temperature rows",
      "source_detail": {
        "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
        "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. X, April 2010 (copy)",
        "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
        "year": 2010,
        "kind": "datasheet",
        "license": "manufacturer datasheet copy, cited not reproduced"
      }
    },
    {
      "benchmark": "uv_exposure_before_yellowing",
      "label": "Continuous UV light exposure before yellowing (manufacturer claim)",
      "value": 17,
      "bound": "exact",
      "unit": "days",
      "scope": "material",
      "conditions": {
        "light": "continuous UV light"
      },
      "method": "Printed on the product page as Can resist yellowing over 17 days of continuous UV light exposure; the light source and test method are not printed",
      "status": "ground",
      "source": "meridian-301-2-page",
      "where": "Features tab",
      "source_detail": {
        "title": "EPO-TEK 301-2, Optically Transparent Epoxy Resin, product page, Meridian Adhesives",
        "id": "Meridian Adhesives product page for EPO-TEK 301-2",
        "url": "https://meridianadhesives.com/products/epo-tek-301-2/",
        "kind": "web",
        "license": "distributor web page, linked not reproduced"
      }
    },
    {
      "benchmark": "total_mass_loss",
      "label": "Total mass loss (TML), NASA outgassing test",
      "value": 2.62,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "cure_time": "24 H",
        "cure_temperature": "25 °C",
        "atmosphere": "air",
        "data_reference": "GSFC9724",
        "test": "ASTM E 595 (identified in RP-1124 as E 595-77/84/90)"
      },
      "method": "Printed in the NASA table as %TML 2.62 for the EPO-TEK 301-2 row",
      "status": "ground",
      "source": "nasa-rp1124",
      "where": "Section 1 Adhesives table, EPO-TEK 301-2 row (PDF page 30)",
      "source_detail": {
        "title": "NASA Reference Publication 1124, Revision 3, Outgassing Data for Selecting Spacecraft Materials",
        "id": "NASA RP-1124 Rev 3, Campbell and Scialdone, Goddard Space Flight Center; NTRS 19940017416",
        "url": "https://ntrs.nasa.gov/api/citations/19940017416/downloads/19940017416.pdf",
        "year": 1993,
        "kind": "report",
        "license": "NASA public document"
      }
    },
    {
      "benchmark": "collected_volatile_condensable_materials",
      "label": "Collected volatile condensable materials (CVCM), NASA outgassing test",
      "value": 1.03,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "cure_time": "24 H",
        "cure_temperature": "25 °C",
        "atmosphere": "air",
        "data_reference": "GSFC9724",
        "test": "ASTM E 595 (identified in RP-1124 as E 595-77/84/90)"
      },
      "method": "Printed in the NASA table as %CVCM 1.03 for the EPO-TEK 301-2 row",
      "status": "ground",
      "source": "nasa-rp1124",
      "where": "Section 1 Adhesives table, EPO-TEK 301-2 row (PDF page 30)",
      "source_detail": {
        "title": "NASA Reference Publication 1124, Revision 3, Outgassing Data for Selecting Spacecraft Materials",
        "id": "NASA RP-1124 Rev 3, Campbell and Scialdone, Goddard Space Flight Center; NTRS 19940017416",
        "url": "https://ntrs.nasa.gov/api/citations/19940017416/downloads/19940017416.pdf",
        "year": 1993,
        "kind": "report",
        "license": "NASA public document"
      }
    },
    {
      "benchmark": "water_vapor_regained",
      "label": "Water vapour regained (WVR), NASA outgassing test",
      "value": 0.2,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "cure_time": "24 H",
        "cure_temperature": "25 °C",
        "atmosphere": "air",
        "data_reference": "GSFC9724"
      },
      "method": "Printed in the NASA table as %WVR 0.20 for the EPO-TEK 301-2 row",
      "status": "ground",
      "source": "nasa-rp1124",
      "where": "Section 1 Adhesives table, EPO-TEK 301-2 row (PDF page 30)",
      "source_detail": {
        "title": "NASA Reference Publication 1124, Revision 3, Outgassing Data for Selecting Spacecraft Materials",
        "id": "NASA RP-1124 Rev 3, Campbell and Scialdone, Goddard Space Flight Center; NTRS 19940017416",
        "url": "https://ntrs.nasa.gov/api/citations/19940017416/downloads/19940017416.pdf",
        "year": 1993,
        "kind": "report",
        "license": "NASA public document"
      }
    }
  ],
  "corrosion": [
    {
      "environment": "Heating of the cured adhesive",
      "headline": "The cured adhesive loses 0.01 % of its weight at 200 °C, 0.46 % at 250 °C and 2.19 % at 300 °C, per the current datasheet.",
      "effect": "The datasheet gives no hold time or atmosphere for these figures, so they describe heating, not service life. The older copy prints the same three figures.",
      "rating": "low",
      "conditions": {
        "basis": "weight loss figures; hold time and atmosphere not printed",
        "cure": "80 °C / 3 Hours"
      },
      "source": "tds-2021",
      "where": "Physical Properties, Weight Loss rows"
    },
    {
      "environment": "Continuous UV light",
      "headline": "The product page says it can resist yellowing over 17 days of continuous UV light exposure.",
      "effect": "This is a manufacturer statement. The light source, yellowing index and test method are not printed.",
      "rating": "unknown",
      "conditions": {
        "basis": "manufacturer statement only"
      },
      "source": "meridian-301-2-page",
      "where": "Features tab"
    },
    {
      "environment": "Ionic residue (chloride and sodium) in the cured adhesive",
      "headline": "The datasheet prints 61 ppm chloride and 104 ppm sodium in the adhesive.",
      "effect": "These are the only corrosion-related numbers printed. The datasheet gives no test method, no limit and no test against metal pads, so the corrosion effect of these ions is not quantified here.",
      "rating": "low",
      "conditions": {
        "basis": "Ion Content row only; no corrosion test printed"
      },
      "source": "tds-2021",
      "where": "Physical Properties, Ion Content row"
    }
  ],
  "risks": {
    "hazards": [
      {
        "text": "Part A (SDS revised May 2023) is classed Warning. It causes skin irritation (H315), serious eye irritation (H319) and may cause an allergic skin reaction (H317). It is toxic to aquatic life (H401) and toxic to aquatic life with long lasting effects (H411).",
        "ghs": [
          "H315",
          "H317",
          "H319",
          "H401",
          "H411"
        ],
        "source": "epotek-sds-partA",
        "where": "Sections 2.1 and 2.2 (GHS US classification and label elements)"
      },
      {
        "text": "Part B (SDS revised May 2023) is classed Danger. It causes severe skin burns and eye damage (H314), causes serious eye damage (H318), and is harmful to aquatic life with long lasting effects (H412). Its main ingredient is polyoxypropylenediamine (CAS 9046-10-0).",
        "ghs": [
          "H314",
          "H318",
          "H412"
        ],
        "source": "epotek-sds-partB",
        "where": "Sections 2.1 and 2.2; Section 3.2 for composition"
      },
      {
        "text": "Harmful dust may be released during cutting, milling or grinding of the product. The Part A SDS lists this as a hazard that does not result in classification.",
        "ghs": [],
        "source": "epotek-sds-partA",
        "where": "Section 2.3 (other hazards)"
      },
      {
        "text": "Part A's main ingredient is bisphenol A diglycidyl ether resin (CAS 1675-54-3). The Part A SDS prints no classification for acute oral, dermal or inhalation toxicity.",
        "ghs": [],
        "source": "epotek-sds-partA",
        "where": "Section 3.2 and Section 11.1"
      }
    ],
    "failure_risks": [
      {
        "mode": "Crystallised Part A",
        "trigger": "Part A held in storage",
        "consequence": "Crystals can form in the resin. The datasheet says to warm the container in an oven until the crystals disappear, and to let it cool to room temperature before mixing.",
        "severity": "low",
        "source": "tds-2021",
        "where": "Notes at the top of the datasheet"
      },
      {
        "mode": "Mass loss when hot",
        "trigger": "Cured adhesive held at 250 °C or 300 °C",
        "consequence": "Weight loss of 0.46 % at 250 °C and 2.19 % at 300 °C, with no hold time printed. Volatile material leaves the cured joint.",
        "severity": "moderate",
        "source": "tds-2021",
        "where": "Physical Properties, Weight Loss rows"
      },
      {
        "mode": "Changed performance after repackaging",
        "trigger": "The material is moved into syringes, bi-paks, cartridges, pouches, tubes or other containers",
        "consequence": "The manufacturer says rheology and other properties may differ from the datasheet, and its warranty does not apply to repackaged product.",
        "severity": "low",
        "source": "tds-2021",
        "where": "Notes at the top of the datasheet"
      },
      {
        "mode": "Outgassing in vacuum",
        "trigger": "Cured adhesive used near optics, sensors or contacts in vacuum",
        "consequence": "In the NASA ASTM E 595 test, the collected volatile condensable material value is 1.03 %, so volatile matter can condense on nearby surfaces.",
        "severity": "moderate",
        "source": "nasa-rp1124",
        "where": "Section 1 Adhesives table, EPO-TEK 301-2 row"
      }
    ],
    "side_effects": [
      {
        "text": "The cured epoxy gives off volatile condensable material (CVCM 1.03 % in the NASA test) when tested in vacuum.",
        "affects": "Nearby optics, detectors and contacts in vacuum (not tested in the sources read)",
        "source": "nasa-rp1124",
        "where": "Section 1 Adhesives table, EPO-TEK 301-2 row"
      }
    ],
    "handling": [
      {
        "text": "Mix Part A and Part B 100 : 35 by weight and use the mix within 8 hours.",
        "source": "tds-2021",
        "where": "Header table, Mix Ratio by Weight and Pot Life rows"
      },
      {
        "text": "Cure at 80 °C for 3 hours. A cure of 23 °C for 48 hours may not reach the performance printed in the datasheet.",
        "source": "tds-2021",
        "where": "Header table, Recommended Cure and Minimum Alternative Cure rows"
      },
      {
        "text": "Store the bulk product at room temperature, where the shelf life is one year, and the syringe form at -40 °C, where the shelf life is six months.",
        "source": "tds-2021",
        "where": "Header table, Shelf Life rows"
      },
      {
        "text": "Wear neoprene, nitrile or butyl gloves and safety glasses. Ensure good ventilation and avoid breathing dust, fume or vapour.",
        "source": "epotek-sds-partA",
        "where": "Sections 7.1 and 8.2 to 8.3 of the Part A SDS"
      },
      {
        "text": "Keep containers closed when not in use.",
        "source": "tds-2021",
        "where": "Notes at the top of the datasheet"
      },
      {
        "text": "Do not repackage the product into other containers without accepting that the manufacturer's warranty does not apply.",
        "source": "tds-2021",
        "where": "Notes at the top of the datasheet"
      }
    ],
    "mitigations": [
      {
        "text": "Cure at the recommended 80 °C for 3 hours rather than the minimum alternative cure, which the datasheet says may not achieve the printed performance.",
        "source": "tds-2021",
        "where": "Header table, Recommended Cure row"
      }
    ]
  },
  "uses": [
    {
      "application": "electronics-and-chips",
      "device": "Semiconductor packaging, including flip-chip underfill, glob-top encapsulation and wafer-level coating",
      "example": "Underfill for flip chips, glob top encapsulation over wire bonds, and spin coating at wafer level including wafer level packaging, per the datasheet.",
      "source": "tds-2021",
      "where": "Advantages and Suggested Application Notes, semiconductor bullet"
    },
    {
      "application": "optics-and-cameras",
      "device": "LCD and LED optics, for lamination, sealing and encapsulation",
      "example": "Suggested for LCD optical lamination and sealing of glass plates, and for LED encapsulation. The datasheet says it can resist yellowing over 17 days of continuous UV light exposure.",
      "source": "tds-2021",
      "where": "Advantages and Suggested Application Notes, first bullets"
    },
    {
      "application": "optics-and-cameras",
      "device": "Fibre optic assemblies",
      "example": "Bundling fibres, terminating fibre into a ferrule, adhesive for mounting optics inside fibre components, and bonding a glass cover slip over a V-groove.",
      "source": "tds-2021",
      "where": "Advantages and Suggested Application Notes, fiber optic bullet"
    },
    {
      "application": "optics-and-cameras",
      "device": "Low-stress bonding of optics inside OEM and scientific instruments",
      "example": "The datasheet calls it a compliant adhesive that will be resistant to impact or vibrations, and a low stress adhesive for bonding optics inside OEM and scientific instruments.",
      "source": "tds-2021",
      "where": "Advantages and Suggested Application Notes, compliant adhesive bullet"
    },
    {
      "application": "optics-and-cameras",
      "device": "Spacecraft optics and instruments where outgassing is screened",
      "example": "NASA RP-1124 lists EPO-TEK 301-2 in its outgassing table with a total mass loss of 2.62 % and a CVCM of 1.03 % after a 24 H cure at 25 °C in air.",
      "source": "nasa-rp1124",
      "where": "Section 1 Adhesives table, EPO-TEK 301-2 row"
    }
  ],
  "supply": [
    {
      "subject": "Bisphenol A diglycidyl ether (BADGE), the Part A resin",
      "abundance": "Feedstock: BADGE is prepared by O-alkylation of bisphenol A with epichlorohydrin. The Part B hardener, polyoxypropylenediamine, has no feedstock or producer data in the sources read. No producer volumes, country shares or critical-mineral status were found for either component.",
      "producers": [],
      "critical_lists": [],
      "recycling": "Not found in any source read.",
      "substitutes": [],
      "source": "wiki-badge",
      "where": "Production paragraph, first sentence"
    }
  ],
  "media": [],
  "documents": [
    {
      "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
      "type": "datasheet",
      "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
      "year": 2021
    },
    {
      "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
      "type": "datasheet",
      "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
      "year": 2010
    },
    {
      "title": "EPO-TEK 301-2 PART A Safety Data Sheet, revision 5/24/2023, version 2.0",
      "type": "sds",
      "url": "https://products.meridianadhesives.com/storage/downloads/sasu3c1vme36hgjycyb5zmy392qt8qye/301-2-sds.pdf",
      "year": 2023
    },
    {
      "title": "EPO-TEK 301-2 PART B Safety Data Sheet, revision 5/24/2023, version 2.0",
      "type": "sds",
      "url": "https://products.meridianadhesives.com/storage/downloads/sasu3c1vme36hgjycyb5zmy392qt8qye/301-2-sds.pdf",
      "year": 2023
    },
    {
      "title": "NASA Reference Publication 1124, Revision 3, Outgassing Data for Selecting Spacecraft Materials",
      "type": "report",
      "url": "https://ntrs.nasa.gov/api/citations/19940017416/downloads/19940017416.pdf",
      "year": 1993
    },
    {
      "title": "PubChem compound record, bisphenol A diglycidyl ether (CID 2286)",
      "type": "database",
      "url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/1675-54-3/property/MolecularFormula,MolecularWeight,IUPACName/JSON"
    }
  ],
  "gaps": [
    "Volume resistivity and coefficient of thermal expansion are printed with a power-of-ten multiplier, so they are not recorded in this file.",
    "Thermal conductivity, thixotropic index and particle size are printed as N/A in the datasheets, so no value is recorded.",
    "No moisture absorption, humidity ageing, dielectric strength or adhesion data were printed in the datasheets read.",
    "No space-environment data beyond the NASA outgassing row was found. No radiation, thermal cycling, flight heritage or cryogenic data was read in this run, although the Rev. X copy's supporting text mentions cryogenic cooling.",
    "No outgassing test was read beyond the NASA RP-1124 row. The product page and the datasheet state a NASA approval and an ASTM test standard as claims; no test report was read.",
    "The current datasheet (Rev. XVIII) and the older copy (Rev. X) disagree on die shear, storage modulus and Part A and Part B specific gravity. Both values are recorded side by side. The current datasheet prints no continuous service limit, while the older copy does.",
    "The older copy claims the product is biocompatible and non-toxic and complies with USP Class VI for medical devices. No test report for that claim was read, and the current datasheet does not repeat it.",
    "A different refractive index shown in a web search snippet was not fetched and is not recorded.",
    "PubChem GHS classification for bisphenol A diglycidyl ether could not be read; the page returned a browser check. Hazards for this profile come from the Part A and Part B SDS.",
    "No producer volumes, country shares, critical-mineral status, recycling or substitute data were found for either component in the sources read.",
    "The degradation temperature method is not printed in the current datasheet; the older copy names TGA, which is not recorded as a separate row.",
    "Some property names are not in the canonical file and are used as snake_case names, including mix_ratio, shelf_life, cure_temperature, cure_time, minimum_alternative_cure_time, total_mass_loss, collected_volatile_condensable_materials, water_vapor_regained, uv_exposure_before_yellowing, spectral_transmission, lap_shear_strength, die_shear_strength, shore_d_hardness, degradation_temperature, weight_loss, storage_modulus, pot_life, specific_gravity, chloride_ion_content and sodium_ion_content.",
    "Shelf life values are printed in words in the datasheet (One year, Six months) and recorded as numbers with units.",
    "No freely licensed photograph or diagram of EPO-TEK 301-2 was fetched, so the media block is omitted."
  ],
  "story": {
    "why": "EPO-TEK 301-2 is a low-viscosity, optically transparent epoxy for bonding and encapsulating optics, fibres and chips. The current datasheet gives a viscosity of 225 - 425 cPs at 23 °C, a refractive index of 1.5318 at 589 nm and a pot life of 8 hours. The datasheet calls it a 'NASA approved, low outgassing epoxy', and NASA RP-1124 lists it in its outgassing table.",
    "uses": [
      {
        "where": "Semiconductor packaging",
        "line": "The datasheet lists underfill for flip chips, glob top encapsulation over wire bonds, and spin coating at wafer level. It is described as a semiconductor grade epoxy."
      },
      {
        "where": "LCD and LED optics",
        "line": "The datasheet suggests it for LCD optical lamination and sealing of glass plates, and for LED encapsulation. It can resist yellowing over 17 days of continuous UV light exposure, as the datasheet and product page both state."
      },
      {
        "where": "Fibre optic assemblies",
        "line": "The datasheet lists bundling fibres, terminating a fibre into a ferrule, and mounting optics inside fibre components as uses."
      },
      {
        "where": "Spacecraft outgassing screening",
        "line": "NASA RP-1124 lists EPO-TEK 301-2 with a total mass loss of 2.62 % and a CVCM of 1.03 % after a 24 H cure at 25 °C."
      }
    ],
    "can_do": [
      {
        "label": "Pour and bond",
        "line": "Viscosity is 225 - 425 cPs at 23 °C at 100 rpm before cure, so the resin flows into small gaps. The datasheet marks the test as a lot acceptance test.",
        "benchmark": "viscosity",
        "scope": "material",
        "value": "225 - 425 cPs"
      },
      {
        "label": "Carry light",
        "line": "Transmission is at least 99 % from 400 to 1,200 nm and at least 94 % at 320 nm, per the current datasheet.",
        "benchmark": "spectral_transmission",
        "scope": "material",
        "value": "at least 99 %"
      },
      {
        "label": "Cure in an oven",
        "line": "The recommended cure is 80 °C for 3 hours. The datasheet says a cure of 23 °C for 48 hours may not reach the printed performance.",
        "benchmark": "cure_temperature",
        "scope": "material",
        "value": "80 °C for 3 hours"
      },
      {
        "label": "Hold a bond",
        "line": "Lap shear is more than 2,000 psi at 23 °C. Die shear is 5,334 psi in the current datasheet and 5,100 psi in the older copy.",
        "benchmark": "lap_shear_strength",
        "scope": "material",
        "value": "more than 2,000 psi"
      },
      {
        "label": "Survive heat",
        "line": "The datasheet prints a degradation temperature of 360 °C. Weight loss is 0.01 % at 200 °C, 0.46 % at 250 °C and 2.19 % at 300 °C.",
        "benchmark": "degradation_temperature",
        "scope": "material",
        "value": "360 °C"
      },
      {
        "label": "Limit outgassing",
        "line": "NASA RP-1124 records a total mass loss of 2.62 % and a CVCM of 1.03 % for this grade.",
        "benchmark": "total_mass_loss",
        "scope": "material",
        "value": "2.62 %"
      }
    ],
    "compare": "Compared with the older copy (Rev. X), the current datasheet (Rev. XVIII) prints a higher storage modulus (432,279 psi against 298,719 psi), a higher die shear (5,334 psi against 5,100 psi) and higher specific gravities (1.15 and 0.95 for Parts A and B, against 1.02 and 0.89). Both revisions print the same refractive index of 1.5318 at 589 nm. In the NASA outgassing table the CVCM of 1.03 % is above the ceiling that RP-1124 sets for its Section C list, so this adhesive does not qualify for that list. The older copy gives a continuous service limit of 200 °C; the current datasheet prints no continuous limit.",
    "compare_rows": [
      {
        "label": "Viscosity",
        "benchmark": "viscosity",
        "scope": "material"
      },
      {
        "label": "Refractive index",
        "benchmark": "refractive_index",
        "scope": "material"
      },
      {
        "label": "Collected volatile condensable materials",
        "benchmark": "collected_volatile_condensable_materials",
        "scope": "material"
      }
    ],
    "handling": [
      "Mix Part A and Part B 100 : 35 by weight and use the mix within 8 hours.",
      "Cure at 80 °C for 3 hours. A cure of 23 °C for 48 hours may not reach the performance printed in the datasheet.",
      "Store the bulk product at room temperature, where the shelf life is one year, and the syringe form at -40 °C, where the shelf life is six months.",
      "If Part A crystallises, warm the container in an oven until the crystals disappear, and let it cool to room temperature before mixing.",
      "Wear neoprene, nitrile or butyl gloves and safety glasses, and avoid breathing dust, fume or vapour.",
      "Keep containers closed when not in use. Do not repackage the product without accepting that the warranty does not apply."
    ],
    "good_for": [
      "Optical bonding and sealing where light passes through the joint, with at least 99 % transmission from 400 to 1,200 nm (current datasheet).",
      "Flip-chip underfill, glob-top encapsulation over wire bonds and wafer-level coating, as the datasheet describes.",
      "Fibre and lens assembly where a low-viscosity epoxy with an 8 hour pot life is needed."
    ],
    "watch_out": [
      "The current datasheet and the older copy disagree on die shear (5,334 psi against 5,100 psi), storage modulus (432,279 psi against 298,719 psi) and Part A specific gravity (1.15 against 1.02). Both values are recorded and the datasheets give no reason.",
      "The older copy says the product is biocompatible and non-toxic and complies with USP Class VI for medical devices. The current datasheet does not repeat that claim, and no test report was read.",
      "Heat: the current datasheet prints a suggested intermittent limit of less than 300 °C and no continuous limit, while the older copy prints 200 °C as a continuous limit.",
      "Outgassing: NASA RP-1124 records a total mass loss of 2.62 % and a CVCM of 1.03 %. The NASA approval wording on the datasheet is a claim, not a test result."
    ],
    "verdict": "EPO-TEK 301-2 is an optically clear two-part epoxy, with a refractive index of 1.5318 at 589 nm and transmission of at least 99 % from 400 to 1,200 nm in the current datasheet. NASA RP-1124 records a total mass loss of 2.62 % and a CVCM of 1.03 % for it, so any vacuum use needs that test data in the design review.",
    "recipe": {
      "line": "EPO-TEK 301-2 is a two-part epoxy: a bisphenol A diglycidyl ether resin (Part A) and a polyoxypropylenediamine hardener (Part B), mixed 100 : 35 by weight. The datasheets and SDS do not give how either component is made.",
      "parts": [
        {
          "name": "Bisphenol A diglycidyl ether resin",
          "symbol": "BADGE",
          "role": "The epoxy resin that cures into a clear solid when mixed with Part B.",
          "share_note": "at least 60 % of Part A by weight, per the Part A SDS"
        },
        {
          "name": "Polyoxypropylenediamine",
          "role": "The hardener (Part B) that reacts with the epoxy resin to cure it.",
          "share_note": "at least 60 % of Part B by weight, per the Part B SDS"
        }
      ]
    },
    "risk_groups": [
      {
        "title": "For people",
        "lead": "Part B is the more hazardous of the two parts. Part A is an irritant and a sensitiser. Both SDSs call for gloves and eye protection.",
        "points": [
          {
            "label": "Part B skin and eyes",
            "line": "Part B causes severe skin burns and eye damage (H314) and serious eye damage (H318). The SDS says to call a poison centre or doctor immediately if swallowed."
          },
          {
            "label": "Part A skin",
            "line": "Part A causes skin irritation (H315) and may cause an allergic skin reaction (H317). Use neoprene, nitrile or butyl gloves."
          },
          {
            "label": "Dust",
            "line": "Harmful dust may be released when the product is cut, milled or ground. Avoid breathing it."
          }
        ],
        "level": 3,
        "verdict": "Part B causes severe skin burns and eye damage"
      },
      {
        "title": "Heat and vacuum: CVCM 1.03 %",
        "lead": "The cured epoxy loses weight when heated and gives off volatile material in vacuum. This is a limit on the design rather than a hazard to people.",
        "points": [
          {
            "label": "Heating",
            "line": "Weight loss is 0.46 % at 250 °C and 2.19 % at 300 °C, with no hold time printed."
          },
          {
            "label": "Vacuum",
            "line": "NASA RP-1124 records a total mass loss of 2.62 % and a CVCM of 1.03 % for a 24 H cure at 25 °C."
          }
        ],
        "level": 2,
        "verdict": "Heat and vacuum mass loss: CVCM 1.03 %"
      },
      {
        "title": "Harmful to aquatic life with long-lasting effects",
        "lead": "Both parts carry aquatic hazard codes. Keep the product out of drains and waterways.",
        "points": [
          {
            "label": "Part A",
            "line": "Part A is toxic to aquatic life (H401) and toxic to aquatic life with long lasting effects (H411)."
          },
          {
            "label": "Part B",
            "line": "Part B is harmful to aquatic life with long lasting effects (H412)."
          }
        ],
        "level": 1,
        "verdict": "Harmful to aquatic life with long-lasting effects"
      }
    ]
  },
  "updated": "2026-11-02",
  "review": {
    "status": "draft",
    "method": "assistant",
    "checked_values": 39,
    "unreachable": 0,
    "caveats": 4,
    "note": "Read by an AI assistant on 2026-11-02 from the pages named in each entry. The current datasheet and the older copy disagree on several values; both are recorded. Shelf life is printed in words. The UV resistance is a manufacturer statement with no test method printed."
  },
  "sources": {
    "tds-2021": {
      "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. XVIII (February 2021)",
      "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. XVIII, February 2021",
      "url": "https://products.meridianadhesives.com/storage/downloads/uennuicaaxt1bodtipkbpydtg0u8qs33/301-2.pdf",
      "year": 2021,
      "kind": "datasheet",
      "license": "manufacturer datasheet, cited not reproduced"
    },
    "tds-2010": {
      "title": "EPO-TEK 301-2 Technical Data Sheet, Rev. X (April 2010), Fiber Optic Center copy",
      "id": "Epoxy Technology, Inc. EPO-TEK 301-2 TDS, Rev. X, April 2010 (copy)",
      "url": "https://focenter.com/media/wysiwyg/docs/Epoxy-Technology--Inc-Epo-Tek-301-2-General-Room-Temp-Cure-Epoxy-(25G)-Fiber-Optic-Center.pdf",
      "year": 2010,
      "kind": "datasheet",
      "license": "manufacturer datasheet copy, cited not reproduced"
    },
    "meridian-301-2-page": {
      "title": "EPO-TEK 301-2, Optically Transparent Epoxy Resin, product page, Meridian Adhesives",
      "id": "Meridian Adhesives product page for EPO-TEK 301-2",
      "url": "https://meridianadhesives.com/products/epo-tek-301-2/",
      "kind": "web",
      "license": "distributor web page, linked not reproduced"
    },
    "epotek-sds-partA": {
      "title": "EPO-TEK 301-2 PART A Safety Data Sheet, revision 5/24/2023, version 2.0",
      "id": "Revision 5/24/2023; issue 5/18/2022; version 2.0",
      "url": "https://products.meridianadhesives.com/storage/downloads/sasu3c1vme36hgjycyb5zmy392qt8qye/301-2-sds.pdf",
      "year": 2023,
      "kind": "datasheet",
      "license": "supplier SDS, linked not reproduced"
    },
    "epotek-sds-partB": {
      "title": "EPO-TEK 301-2 PART B Safety Data Sheet, revision 5/24/2023, version 2.0",
      "id": "Revision 5/24/2023; issue 5/18/2022; version 2.0 (Part B section of the same file)",
      "url": "https://products.meridianadhesives.com/storage/downloads/sasu3c1vme36hgjycyb5zmy392qt8qye/301-2-sds.pdf",
      "year": 2023,
      "kind": "datasheet",
      "license": "supplier SDS, linked not reproduced"
    },
    "nasa-rp1124": {
      "title": "NASA Reference Publication 1124, Revision 3, Outgassing Data for Selecting Spacecraft Materials",
      "id": "NASA RP-1124 Rev 3, Campbell and Scialdone, Goddard Space Flight Center; NTRS 19940017416",
      "url": "https://ntrs.nasa.gov/api/citations/19940017416/downloads/19940017416.pdf",
      "year": 1993,
      "kind": "report",
      "license": "NASA public document"
    },
    "wiki-badge": {
      "title": "Wikipedia, Bisphenol A diglycidyl ether",
      "url": "https://en.wikipedia.org/wiki/Bisphenol_A_diglycidyl_ether",
      "kind": "web",
      "license": "CC BY-SA, cited for production and composition only"
    },
    "pubchem-badge": {
      "title": "PubChem compound record, bisphenol A diglycidyl ether (CID 2286)",
      "id": "PubChem CID 2286; CAS 1675-54-3",
      "url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/1675-54-3/property/MolecularFormula,MolecularWeight,IUPACName/JSON",
      "kind": "database",
      "license": "public database record, linked not reproduced"
    }
  },
  "license": "CC-BY-4.0",
  "url": "https://spacemushroom.com/profiles/epo-tek-301-2/"
}