{
  "spore": "profile",
  "id": "pom-delrin",
  "spore_version": "0.2",
  "family": "engineering-polymers",
  "name": "Polyoxymethylene (acetal), POM",
  "abbreviation": "POM",
  "role": "engineering thermoplastic for precision moulded parts; Delrin is a DuPont trade name for POM",
  "category": "polymers",
  "type": "acetals",
  "summary": "Polyoxymethylene (POM), also called acetal and sold as Delrin, is a semicrystalline engineering thermoplastic sold as a homopolymer or a copolymer. Two Celanese Hostaform copolymer grades read for this profile have a density of 1410 kg/m3 (ISO 1183), a melting temperature of 165 °C (C 2521) and 166 °C (C 13021 FC) at 10 °C/min, and a tensile modulus of 2600 MPa (C 2521) and 2700 MPa (C 13021 FC). As a sample on the MISSE 2 experiment in low Earth orbit it had an atomic oxygen erosion yield of 9.14e-24 cm3/atom (NASA TM-2008-215490, Table I). No homopolymer Delrin datasheet was read in this run.\n",
  "best_for": "Stiff, dimensionally stable moulded parts: a 2700 MPa tensile modulus and 64 MPa yield stress in the C 13021 FC copolymer grade",
  "weakest_at": "Atomic oxygen in low Earth orbit: an erosion yield of 9.14e-24 cm3/atom on MISSE 2",
  "identity": {
    "formula": "CH2O (smallest repeat unit as listed by NASA)",
    "designations": [],
    "source": "nasa-tm-2008-215490",
    "where": "Table IV, column Formula"
  },
  "tags": {
    "environments": [
      "low-earth-orbit"
    ],
    "stresses": [
      "atomic-oxygen",
      "vacuum-and-outgassing"
    ],
    "applications": []
  },
  "properties": [
    {
      "benchmark": "density",
      "label": "Density, Hostaform C 2521 (copolymer)",
      "value": 1410,
      "bound": "exact",
      "unit": "kg/m3",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 2521, POM copolymer",
        "temperature": "not printed on the page"
      },
      "method": "ISO 1183, as printed on the Material Data Center datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c2521",
      "where": "Datasheet table, row Density (Other properties)",
      "source_detail": {
        "title": "Hostaform C 2521, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
        "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "melting_point",
      "label": "Melting temperature, Hostaform C 2521 (copolymer)",
      "value": 165,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 2521, POM copolymer",
        "rate": "10 °C/min"
      },
      "method": "ISO 11357-1/-3 (DSC), as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c2521",
      "where": "Datasheet table, row Melting temperature, 10°C/min",
      "source_detail": {
        "title": "Hostaform C 2521, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
        "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "tensile_modulus",
      "label": "Tensile modulus, Hostaform C 2521 (copolymer)",
      "value": 2600,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 2521, POM copolymer",
        "test": "ISO 527 as printed"
      },
      "method": "ISO 527, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c2521",
      "where": "Datasheet table, row Tensile Modulus",
      "source_detail": {
        "title": "Hostaform C 2521, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
        "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "tensile_yield_strength",
      "label": "Yield stress, Hostaform C 2521 (copolymer)",
      "value": 62,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 2521, POM copolymer",
        "test": "ISO 527 as printed"
      },
      "method": "ISO 527, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c2521",
      "where": "Datasheet table, row Yield stress",
      "source_detail": {
        "title": "Hostaform C 2521, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
        "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "nominal_strain_at_break",
      "label": "Nominal strain at break, Hostaform C 2521 (copolymer)",
      "value": 32,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 2521, POM copolymer",
        "test": "ISO 527 as printed"
      },
      "method": "ISO 527, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c2521",
      "where": "Datasheet table, row Nominal strain at break",
      "source_detail": {
        "title": "Hostaform C 2521, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
        "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "charpy_notched_impact",
      "label": "Charpy notched impact strength at +23 °C, Hostaform C 2521",
      "value": 8.5,
      "bound": "exact",
      "unit": "kJ/m2",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 2521, POM copolymer",
        "temperature": "+23 °C",
        "notch": "type A, as printed"
      },
      "method": "ISO 179/1eA, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c2521",
      "where": "Datasheet table, row Charpy notched impact strength, +23°C",
      "source_detail": {
        "title": "Hostaform C 2521, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
        "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "heat_deflection_temperature",
      "label": "Temperature of deflection under load (HDT), Hostaform C 2521",
      "value": 101,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 2521, POM copolymer",
        "load": "1.80 MPa"
      },
      "method": "ISO 75-1/-2, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c2521",
      "where": "Datasheet table, row Temp. of deflection under load, 1.80 MPa (HDT)",
      "source_detail": {
        "title": "Hostaform C 2521, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
        "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "density",
      "label": "Density, Hostaform C 13021 FC (copolymer)",
      "value": 1410,
      "bound": "exact",
      "unit": "kg/m3",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 13021 FC, POM copolymer",
        "temperature": "not printed on the page"
      },
      "method": "ISO 1183, as printed on the Material Data Center datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c13021fc",
      "where": "Datasheet table, row Density (密度)",
      "source_detail": {
        "title": "Hostaform C 13021 FC, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 13021 FC",
        "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "melting_point",
      "label": "Melting temperature, Hostaform C 13021 FC (copolymer)",
      "value": 166,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 13021 FC, POM copolymer",
        "rate": "10 °C/min"
      },
      "method": "ISO 11357-1/-3 (DSC), as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c13021fc",
      "where": "Datasheet table, row Melting temperature, 10°C/min",
      "source_detail": {
        "title": "Hostaform C 13021 FC, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 13021 FC",
        "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "tensile_modulus",
      "label": "Tensile modulus, Hostaform C 13021 FC (copolymer)",
      "value": 2700,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 13021 FC, POM copolymer",
        "test": "ISO 527 as printed"
      },
      "method": "ISO 527, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c13021fc",
      "where": "Datasheet table, row Tensile modulus (拉伸模量)",
      "source_detail": {
        "title": "Hostaform C 13021 FC, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 13021 FC",
        "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "tensile_yield_strength",
      "label": "Yield stress, Hostaform C 13021 FC (copolymer)",
      "value": 64,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 13021 FC, POM copolymer",
        "test": "ISO 527 as printed"
      },
      "method": "ISO 527, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c13021fc",
      "where": "Datasheet table, row Yield stress (屈服应力)",
      "source_detail": {
        "title": "Hostaform C 13021 FC, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 13021 FC",
        "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "nominal_strain_at_break",
      "label": "Nominal strain at break, Hostaform C 13021 FC (copolymer)",
      "value": 30,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 13021 FC, POM copolymer",
        "test": "ISO 527 as printed"
      },
      "method": "ISO 527, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c13021fc",
      "where": "Datasheet table, row Nominal strain at break (名义断裂伸长率)",
      "source_detail": {
        "title": "Hostaform C 13021 FC, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 13021 FC",
        "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "charpy_notched_impact",
      "label": "Charpy notched impact strength at +23 °C, Hostaform C 13021 FC",
      "value": 6,
      "bound": "exact",
      "unit": "kJ/m2",
      "scope": "material",
      "conditions": {
        "grade": "Hostaform C 13021 FC, POM copolymer",
        "temperature": "+23 °C",
        "notch": "type A, as printed"
      },
      "method": "ISO 179/1eA, as printed on the datasheet",
      "status": "ground",
      "source": "mdc-hostaform-c13021fc",
      "where": "Datasheet table, row Charpy impact, +23°C (简支梁缺口冲击强度)",
      "source_detail": {
        "title": "Hostaform C 13021 FC, Material Data Center typical properties",
        "id": "Material Data Center trade name entry, Celanese Hostaform C 13021 FC",
        "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434",
        "kind": "database",
        "license": "third-party database page, linked not reproduced"
      }
    },
    {
      "benchmark": "atomic_oxygen_erosion_yield",
      "label": "Atomic oxygen erosion yield, POM (MISSE 2)",
      "value": 9.14e-24,
      "bound": "exact",
      "unit": "cm3/atom",
      "scope": "material",
      "conditions": {
        "platform": "ISS, MISSE 2 PEC 2 tray 1, low Earth orbit",
        "fluence": "8.43e21 atoms/cm2",
        "duration": "3.95 years"
      },
      "method": "Measured on MISSE 2 flight samples and listed in NASA TM-2008-215490",
      "status": "flight",
      "source": "nasa-tm-2008-215490",
      "where": "Table I, MISSE 2 PEACE polymers erosion yield data (passport misse2-pom-delrin)",
      "source_detail": {
        "title": "Atomic Oxygen Erosion Yield Predictive Tool for Spacecraft Polymers in Low Earth Orbit",
        "id": "NASA/TM-2008-215490 (Banks, Backus and de Groh, 2008), NTRS 20090011780",
        "url": "https://ntrs.nasa.gov/citations/20090011780",
        "year": 2008,
        "kind": "report",
        "license": "NASA public document"
      }
    },
    {
      "benchmark": "density",
      "label": "Density, Delrin 500P NC010 (homopolymer)",
      "value": 1.42,
      "bound": "exact",
      "unit": "g/cm³",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "temperature": "not printed"
      },
      "method": "ISO 1183, as printed on the DuPont datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Physical table, row Density",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "melting_point",
      "label": "Melting temperature, Delrin 500P NC010 (homopolymer)",
      "value": 178,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer"
      },
      "method": "ISO 11357-3, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Thermal table, row Melting Temperature",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "tensile_modulus",
      "label": "Tensile modulus, Delrin 500P NC010 (homopolymer)",
      "value": 3100,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "test": "ISO 527-2 as printed"
      },
      "method": "ISO 527-2, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Mechanical table, row Tensile Modulus",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "tensile_yield_strength",
      "label": "Tensile stress at yield, Delrin 500P NC010 (homopolymer)",
      "value": 71,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "test": "ISO 527-2 as printed"
      },
      "method": "ISO 527-2, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Mechanical table, row Tensile Stress (Yield)",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "nominal_strain_at_break",
      "label": "Nominal tensile strain at break, Delrin 500P NC010 (homopolymer)",
      "value": 30,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "test": "ISO 527-2 as printed"
      },
      "method": "ISO 527-2, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Mechanical table, row Nominal Tensile Strain at Break",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "flexural_modulus",
      "label": "Flexural modulus, Delrin 500P NC010 (homopolymer)",
      "value": 3000,
      "bound": "exact",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer"
      },
      "method": "ISO 178, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Mechanical table, row Flexural Modulus",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "charpy_notched_impact",
      "label": "Charpy notched impact strength at 23 °C, Delrin 500P NC010 (homopolymer)",
      "value": 9,
      "bound": "exact",
      "unit": "kJ/m2",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "temperature": "23 °C (73 °F)",
        "notch": "type A, ISO 179/1eA"
      },
      "method": "ISO 179/1eA, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Impact table, Charpy Notched Impact Strength, 73°F (23°C) row",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "heat_deflection_temperature",
      "label": "Heat deflection temperature at 1.8 MPa (unannealed), Delrin 500P NC010",
      "value": 95,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "load": "264 psi (1.8 MPa), unannealed"
      },
      "method": "ISO 75-2/A, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Thermal table, Heat Deflection Temperature, 264 psi (1.8 MPa), Unannealed row",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "vicat_softening_temperature",
      "label": "Vicat softening temperature, Delrin 500P NC010",
      "value": 155,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "method_load": "ISO 306/B50"
      },
      "method": "ISO 306/B50, as printed on the datasheet",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Thermal table, row Vicat Softening Temperature",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    },
    {
      "benchmark": "cte",
      "label": "Coefficient of linear thermal expansion, flow direction, Delrin 500P NC010",
      "value": 0.0001,
      "bound": "exact",
      "unit": "cm/cm/°C",
      "scope": "material",
      "conditions": {
        "grade": "Delrin 500P NC010, POM homopolymer",
        "direction": "flow"
      },
      "method": "ISO 11359-2, as printed on the datasheet (printed as 1.0E-4 cm/cm/°C)",
      "status": "ground",
      "source": "dupont-delrin-500p",
      "where": "Thermal table, CLTE, Flow row (SI column)",
      "source_detail": {
        "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
        "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
        "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
        "kind": "datasheet",
        "license": "manufacturer datasheet, linked not reproduced"
      }
    }
  ],
  "corrosion": [
    {
      "environment": "Chlorine gas and bleaching fluid",
      "headline": "Chlorine attacks acetal at 3 to 5 ppm and higher, so long-term continuous exposure is not recommended.",
      "effect": "DuPont states that DELRIN acetal resin is attacked by chlorine at concentrations of 3 to 5 ppm and higher, and is not recommended for long term continuous exposure at these concentrations. Its rating table marks chlorine gas and 10 percent bleaching fluid as unsatisfactory.",
      "rating": "severe",
      "conditions": {
        "basis": "unstressed specimens in continuous exposure; rating table at ambient temperature"
      },
      "source": "dupont-delrin-design-guide",
      "where": "Chapter 7 (Effects), Resistance to chemicals: zinc chloride and chlorine section; rating table"
    },
    {
      "environment": "Zinc chloride, and salt water in contact with zinc-plated steel",
      "headline": "Zinc chloride depolymerises acetal; salt water alone does not affect it.",
      "effect": "DuPont says zinc chloride acts to depolymerise (corrode) DELRIN acetal resin, with attack depending on stress, temperature, concentration and time. Salt water alone does not affect it, but salt water with zinc-plated steel can give a slower effect similar to zinc chloride.",
      "rating": "moderate",
      "conditions": {
        "basis": "stress, temperature, concentration and time are not quantified in the guide"
      },
      "source": "dupont-delrin-design-guide",
      "where": "Chapter 7 (Effects), Resistance to chemicals: zinc chloride and chlorine section"
    },
    {
      "environment": "Strong acids and strong bases; steam and hot water",
      "headline": "Service life is reduced by lengthy use in steam, hot water, strong acids or strong bases.",
      "effect": "DuPont lists steam, hot water, strong acids and strong bases as reducing service life. Its rating table marks hydrochloric acid (10 percent), sulphuric acid (30 percent), nitric acid (10 percent), perchloric acid (10 percent) and phosphoric acid (30 percent) as unsatisfactory, and acetic acid (5 percent) as resistant.",
      "rating": "moderate",
      "conditions": {
        "basis": "unstressed specimens at ambient temperature; the guide says intermittent exposure and service stresses can change the result"
      },
      "source": "dupont-delrin-design-guide",
      "where": "Introduction, service life statement; Chapter 7 rating table"
    },
    {
      "environment": "Hot water and strong caustic or high pH solutions, copolymer against homopolymer",
      "headline": "Copolymer acetal resists hot water and strong caustics better than homopolymer, per Alro.",
      "effect": "Alro lists better resistance to hot water and strong caustics, or high pH solutions, as an advantage of acetal copolymer over homopolymer. No temperature, concentration or time is printed.",
      "rating": "low",
      "conditions": {
        "basis": "comparison of copolymer and homopolymer, no test figures printed"
      },
      "source": "alro-acetal-catalog",
      "where": "Acetal section, list of advantages of copolymer over homopolymer"
    },
    {
      "environment": "Sunlight UV (290 to 400 nm), outdoors and through glass",
      "headline": "Acetal is affected by sunlight; UV-stabilised grades are offered for outdoor and glass-behind use.",
      "effect": "DuPont says acetal resins, like most polymers, are affected by light, particularly sunlight with ultraviolet radiation of 290 to 400 nm. It lists UV-stabilised grades (for example DELRIN 127UV, 527UV and 927UV) with excellent UV resistance and thermal stability, and says the x27UV series suits parts exposed to sunlight through glass. No retention figure is printed.",
      "rating": "moderate",
      "conditions": {
        "wavelength": "290 to 400 nm",
        "basis": "grade dependent; no dose or retention figure printed"
      },
      "source": "dupont-delrin-design-guide",
      "where": "Chapter 7 (Effects), Weathering section; grade list"
    },
    {
      "environment": "Gamma radiation",
      "headline": "DuPont gives depolymerisation as the predominant degradation mode under gamma ray dosage.",
      "effect": "DuPont says that the predominant mode of degradation resulting from gamma ray dosage is depolymerisation. The guide prints no dose figure in the text read.",
      "rating": "moderate",
      "conditions": {
        "dose": "not printed in the text read"
      },
      "source": "dupont-delrin-design-guide",
      "where": "Chapter 7 (Effects), Exposure to high energy radiation section"
    },
    {
      "environment": "Unstressed exposure in air at 60 C, long term",
      "headline": "DELRIN 500 keeps a tensile strength above 55 MPa for about 5 years at 60 C.",
      "effect": "DuPont's long-term exposure curve for unstressed injection-moulded bars in air says DELRIN 500 would keep a tensile strength in excess of 55 MPa for approximately 5 years at 60 C.",
      "rating": "low",
      "conditions": {
        "temperature": "60 C",
        "stress": "none, unstressed",
        "grade": "DELRIN 500"
      },
      "source": "dupont-delrin-design-guide",
      "where": "Chapter 7 (Effects), Exposure in air at elevated temperature, Figure 7.02 text"
    },
    {
      "environment": "Fuels: M-15 gasoline (15 percent methanol) and diesel at 60 C",
      "headline": "Standard grades change only slightly after 1500 h in M-15 and hardly at all in diesel.",
      "effect": "DuPont aged DELRIN 500 and 500P NC010 for up to 1500 hours at 60 C in M-15, and reports only small changes from slight plastification by fuel absorption. In diesel, bio-diesel and kerosene it reports almost no change in dimensional or mechanical properties after 2000 hours at 60 C.",
      "rating": "low",
      "conditions": {
        "temperature": "60 C",
        "time": "up to 1500 h in M-15; up to 2000 h in diesel",
        "fuel": "M-15 is regular gasoline with 15 percent methanol"
      },
      "source": "dupont-delrin-design-guide",
      "where": "Chapter 7 (Effects), Resistance to chemicals: fuels section; Figure 7.01"
    }
  ],
  "risks": {
    "hazards": [
      {
        "text": "Formaldehyde (CAS 50-00-0), the monomer POM is made from. PubChem aggregated GHS: Danger, with H302 harmful if swallowed, H314 causes severe skin burns and eye damage, H317 may cause an allergic skin reaction, H330 fatal if inhaled, H341 suspected of causing genetic defects and H350 may cause cancer. The POM polymer itself has no GHS entry in PubChem.",
        "ghs": [
          "H302",
          "H314",
          "H317",
          "H330",
          "H341",
          "H350"
        ],
        "source": "pubchem-formaldehyde",
        "where": "Safety and Hazards, GHS Classification (aggregated, CID 712)"
      }
    ],
    "failure_risks": [
      {
        "mode": "Atomic oxygen erosion in low Earth orbit",
        "trigger": "Exposure of a POM part to atomic oxygen in low Earth orbit, as on the MISSE 2 flight",
        "consequence": "Surface erosion at a yield of 9.14e-24 cm3/atom as measured on MISSE 2",
        "severity": "moderate",
        "source": "nasa-tm-2008-215490",
        "where": "Table I"
      },
      {
        "mode": "Chlorine attack",
        "trigger": "Chlorine gas or bleach at 3 to 5 ppm and higher, in long-term continuous exposure",
        "consequence": "Attack on the acetal; DuPont rates chlorine gas and 10 percent bleaching fluid as unsatisfactory",
        "severity": "critical",
        "source": "dupont-delrin-design-guide",
        "where": "Chapter 7, Zinc chloride and chlorine; rating table"
      },
      {
        "mode": "Zinc chloride depolymerisation",
        "trigger": "Zinc chloride, or salt water in contact with zinc-plated steel",
        "consequence": "Depolymerisation (corrosion) of the acetal, depending on stress, temperature, concentration and time",
        "severity": "moderate",
        "source": "dupont-delrin-design-guide",
        "where": "Chapter 7, Zinc chloride and chlorine"
      },
      {
        "mode": "Strong acid or strong base attack",
        "trigger": "Lengthy use in strong acids or strong bases, or in steam and hot water",
        "consequence": "Shorter service life; DuPont rates hydrochloric, sulphuric, nitric and phosphoric acids at 10 to 30 percent as unsatisfactory",
        "severity": "moderate",
        "source": "dupont-delrin-design-guide",
        "where": "Introduction, service life statement; Chapter 7 rating table"
      },
      {
        "mode": "UV degradation in sunlight",
        "trigger": "Sunlight UV at 290 to 400 nm on standard grades, outdoors or through glass",
        "consequence": "Light-induced degradation; UV-stabilised grades are offered for this exposure",
        "severity": "moderate",
        "source": "dupont-delrin-design-guide",
        "where": "Chapter 7, Weathering section"
      },
      {
        "mode": "Gamma radiation depolymerisation",
        "trigger": "Gamma ray dosage",
        "consequence": "DuPont gives depolymerisation as the predominant degradation mode",
        "severity": "moderate",
        "source": "dupont-delrin-design-guide",
        "where": "Chapter 7, Exposure to high energy radiation"
      }
    ],
    "side_effects": [],
    "handling": [
      {
        "text": "Keep chlorine, bleach and chlorinated water away from stressed parts. DuPont does not recommend long-term continuous exposure at 3 to 5 ppm chlorine and above.",
        "source": "dupont-delrin-design-guide",
        "where": "Chapter 7, Zinc chloride and chlorine"
      },
      {
        "text": "Use local extraction where heating or processing may release formaldehyde; the formaldehyde GHS codes above are the reason. No POM-specific release figure was read.",
        "source": "pubchem-formaldehyde",
        "where": "Safety and Hazards, GHS Classification"
      }
    ],
    "mitigations": [
      {
        "text": "For sunlight exposure, choose a UV-stabilised grade such as DELRIN 127UV, 527UV or 927UV, per the DuPont grade list.",
        "source": "dupont-delrin-design-guide",
        "where": "Grade list"
      },
      {
        "text": "For hot water or strong caustic service, choose a copolymer grade, which Alro says resists these better than homopolymer.",
        "source": "alro-acetal-catalog",
        "where": "Acetal section, copolymer advantages"
      }
    ]
  },
  "uses": [
    {
      "application": "mechanisms",
      "device": "Gears and drive trains",
      "example": "DuPont lists DELRIN 100 for high performance engineering parts such as gears, and DELRIN 500CL for gears, drive trains and sliding devices. Alro lists gears and pulleys among its acetal applications.",
      "source": "dupont-delrin-design-guide",
      "where": "Grade list, DELRIN 100 and DELRIN 500CL rows"
    },
    {
      "application": "mechanisms",
      "device": "Zippers and thin-section parts",
      "example": "DuPont lists DELRIN 900P, a low-viscosity grade for thin sections, for consumer electronics parts and zippers.",
      "source": "dupont-delrin-design-guide",
      "where": "Grade list, DELRIN 900P row"
    },
    {
      "application": "structures",
      "device": "Fasteners and snap-fits",
      "example": "DuPont lists DELRIN 500 for general mechanical parts, automotive fuel systems, snap-fits, fasteners and gears, and DELRIN 100T for fasteners, seat belt restraint systems and gears.",
      "source": "dupont-delrin-design-guide",
      "where": "Grade list, DELRIN 500 and DELRIN 100T rows"
    }
  ],
  "supply": [
    {
      "subject": "Formaldehyde, the feedstock for POM",
      "producers": [],
      "critical_lists": [],
      "substitutes": [],
      "source": "pubchem-formaldehyde",
      "where": "Methods of Manufacturing"
    },
    {
      "subject": "POM resin, made by polymerisation of formaldehyde",
      "producers": [
        {
          "country": "Polyplastics (Daicel)"
        },
        {
          "country": "Celanese"
        },
        {
          "country": "DuPont"
        }
      ],
      "critical_lists": [],
      "substitutes": [],
      "source": "daicel-history",
      "where": "Corporate history, 1964 and October 2020 entries"
    }
  ],
  "media": [],
  "documents": [
    {
      "title": "Hostaform C 2521, Material Data Center datasheet",
      "type": "datasheet",
      "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434"
    },
    {
      "title": "Hostaform C 13021 FC, Material Data Center datasheet",
      "type": "datasheet",
      "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434"
    },
    {
      "title": "Polyoxymethylene, Wikipedia",
      "type": "report",
      "url": "https://en.wikipedia.org/wiki/Polyoxymethylene"
    },
    {
      "title": "Delrin 500P NC010, DuPont technical data sheet (PDF, via Protolabs)",
      "type": "datasheet",
      "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf"
    },
    {
      "title": "Banks, Backus and de Groh, Atomic Oxygen Erosion Yield Predictive Tool for Spacecraft Polymers in Low Earth Orbit, NASA/TM-2008-215490",
      "type": "report",
      "url": "https://ntrs.nasa.gov/citations/20090011780",
      "year": 2008
    },
    {
      "title": "PubChem, Formaldehyde CID 712 (GHS and manufacture)",
      "type": "database",
      "url": "https://pubchem.ncbi.nlm.nih.gov/compound/712"
    },
    {
      "title": "DELRIN acetal resin design information, DuPont",
      "type": "datasheet",
      "url": "https://www.spacematdb.com/spacemat/manudatasheets/Delrin%20design%20info.pdf"
    },
    {
      "title": "Delrin acetal homopolymer technical data sheet",
      "type": "datasheet",
      "url": "https://laminatedplastics.com/delrin.pdf"
    },
    {
      "title": "Alro Plastics acetal section",
      "type": "datasheet",
      "url": "https://www.alro.com/Resources/WebResources/AlroCom/PlasticsReferanceCatalog/PDFs/002-Acetals.pdf"
    },
    {
      "title": "DAICEL corporate history",
      "type": "report",
      "url": "https://www.daicel.com/en/corporate/history/"
    }
  ],
  "gaps": [
    "Delrin 500P NC010 values are from a DuPont datasheet PDF hosted by Protolabs (not the DuPont site); the Nordson-hosted and plasticker copies seen in search were not read, so their different figures are not used.",
    "Supply volumes: no POM or formaldehyde production volume or country share was read. Producer names come from the Daicel history page and the Material Data Center datasheets. Asahi Kasei, BASF, Mitsubishi Gas Chemical and others named in market-report snippets are not verified and are not listed.",
    "Ageing: no temperature, rate or formaldehyde figure for thermal degradation of POM was read. The DuPont guide names depolymerisation only for zinc chloride and gamma dose.",
    "Corrosion: DuPont gives qualitative ratings and some time-based data only. The Celanese Hostaform product manual and Celcon design guide returned HTML rather than readable PDF, so no Celanese chemical table is used.",
    "Hazards: PubChem has no record for polyoxymethylene. Lookups by name and by CAS 9002-81-7 returned not found, so no POM GHS entry is recorded. The hazards above are for formaldehyde.",
    "Uses: only DuPont grade-list uses and one Alro line are recorded. No sourced use for POM in space was read.",
    "No Delrin homopolymer grade other than 500P NC010 has a datasheet value in this profile. The DuPont design guide and Delrin technical data sheet give qualitative statements for other grades.",
    "Flexural modulus, HDT and Izod impact are not printed on the C 13021 FC datasheet read, and flexural modulus is not printed on C 2521.",
    "No outgassing, total mass loss, UV, radiation or thermal-cycling result for POM in space was read; the passport lists these stresses but gives no values for them.",
    "Test conditions and standards are as printed on the Material Data Center pages; the Celanese originals were not reached."
  ],
  "story": {
    "why": "Polyoxymethylene is a semicrystalline engineering thermoplastic. The two Hostaform copolymer grades read here have a density of 1410 kg/m3 and melting temperatures of 165 °C (C 2521) and 166 °C (C 13021 FC) at 10 °C/min. Their tensile moduli are 2600 MPa and 2700 MPa.",
    "uses": [
      {
        "where": "Gears and drive trains",
        "line": "DuPont lists DELRIN 100 for gears and DELRIN 500CL for gears, drive trains and sliding devices."
      },
      {
        "where": "Zippers and thin-section parts",
        "line": "DuPont lists DELRIN 900P, a low-viscosity grade for thin sections, for consumer electronics parts and zippers."
      },
      {
        "where": "Fasteners and snap-fits",
        "line": "DuPont lists DELRIN 500 for snap-fits, fasteners and gears, and DELRIN 100T for fasteners and seat belt systems."
      }
    ],
    "can_do": [
      {
        "label": "Stiff moulding grade",
        "line": "Hostaform C 13021 FC has a tensile modulus of 2700 MPa and a yield stress of 64 MPa under ISO 527, as printed on its datasheet page.",
        "benchmark": "tensile_modulus",
        "scope": "material",
        "value": "2700 MPa tensile modulus"
      },
      {
        "label": "Heat under load",
        "line": "Hostaform C 2521 has a temperature of deflection under load of 101 °C at 1.80 MPa, ISO 75-1/-2, as printed on its datasheet page.",
        "benchmark": "heat_deflection_temperature",
        "scope": "material",
        "value": "101 °C HDT at 1.80 MPa"
      },
      {
        "label": "Survive in orbit",
        "line": "NASA lists a MISSE 2 erosion yield for polyoxymethylene of 9.14e-24 cm3/atom, in Table I.",
        "benchmark": "atomic_oxygen_erosion_yield",
        "scope": "material",
        "value": "9.14e-24 cm3/atom"
      }
    ],
    "compare": "The two grades are read from one database, so compare the rows as examples for these two Hostaform grades, not as a ranking of all POM.",
    "compare_rows": [
      {
        "label": "Density",
        "benchmark": "density",
        "scope": "material"
      },
      {
        "label": "Melting temperature",
        "benchmark": "melting_point",
        "scope": "material"
      },
      {
        "label": "Tensile modulus",
        "benchmark": "tensile_modulus",
        "scope": "material"
      }
    ],
    "handling": [
      "Specify the grade: the two copolymer grades read differ in modulus and melting temperature.",
      "Treat the datasheet values as typical values as printed, not as specification limits."
    ],
    "good_for": [
      "Stiff moulded parts: 2700 MPa tensile modulus and 64 MPa yield stress in Hostaform C 13021 FC, as printed.",
      "Known atomic oxygen behaviour: 9.14e-24 cm3/atom on MISSE 2 in low Earth orbit."
    ],
    "watch_out": [
      "Atomic oxygen erodes POM at 9.14e-24 cm3/atom, so exterior use needs protection or a rate allowance.",
      "No Delrin homopolymer value was read, so the numbers here are for copolymer grades only.",
      "Flexural modulus and Izod impact were not found on the datasheets read."
    ],
    "verdict": "Polyoxymethylene is a stiff engineering plastic: the two copolymer grades read have a density of 1410 kg/m3, a melting temperature of 165 to 166 °C, and a tensile modulus of 2600 to 2700 MPa. Its MISSE 2 erosion yield of 9.14e-24 cm3/atom is recorded, and no homopolymer Delrin data is in this profile yet.",
    "recipe": {
      "line": "Polyoxymethylene is a chain of repeating CH2O units, made from formaldehyde. The homopolymer is end-capped to stabilise it; the copolymer contains about 1 to 1.5 percent CH2CH2O units along the chain (Wikipedia, composition only; key wiki-pom).",
      "parts": [
        {
          "name": "Carbon",
          "symbol": "C",
          "role": "One carbon per CH2O repeat unit, part of the backbone.",
          "atoms": 1,
          "atomic_weight": 12.011
        },
        {
          "name": "Hydrogen",
          "symbol": "H",
          "role": "Two hydrogens per CH2O repeat unit.",
          "atoms": 2,
          "atomic_weight": 1.008
        },
        {
          "name": "Oxygen",
          "symbol": "O",
          "role": "One ether oxygen per CH2O repeat unit, joining the backbone.",
          "atoms": 1,
          "atomic_weight": 15.999
        }
      ]
    },
    "risk_groups": [
      {
        "title": "For people",
        "lead": "POM has no GHS entry in PubChem; the hazard here is formaldehyde, the monomer it is made from.",
        "points": [
          {
            "label": "Classification",
            "line": "Formaldehyde carries H302, H314, H317, H330, H341 and H350 (PubChem aggregated). Chlorine and strong acids are a corrosion risk for parts, not a listed hazard for people."
          }
        ],
        "level": 1,
        "verdict": "Formaldehyde hazard"
      },
      {
        "title": "If it fails",
        "lead": "The failure route in these sources is erosion in orbit, measured on one flight sample.",
        "points": [
          {
            "label": "Atomic oxygen",
            "line": "On MISSE 2 the erosion yield was 9.14e-24 cm3/atom, from the same NASA report."
          }
        ]
      }
    ]
  },
  "updated": "2026-10-18",
  "review": {
    "status": "draft",
    "method": "assistant",
    "checked_values": 24,
    "unreachable": 4,
    "caveats": 5,
    "note": "Values were read by an AI assistant on 2026-10-18. The two copolymer grades were read from Material Data Center pages (third-party, not Celanese originals). The erosion yield was copied from the passport misse2-pom-delrin, which was verified by hand. Unreachable: Delrin 500P, 500T and 500CPE pages on Material Data Center (404), Celanese datasheets (403/404), CURBELL acetal page (403). Caveats: no Delrin homopolymer value is recorded; the copolymer values are for Hostaform grades, not Delrin; the erosion yield is for one flight sample; source count is 10 (see sources)."
  },
  "sources": {
    "wiki-pom": {
      "title": "Polyoxymethylene, Wikipedia (composition and history only)",
      "id": "Wikipedia article Polyoxymethylene",
      "url": "https://en.wikipedia.org/wiki/Polyoxymethylene",
      "kind": "web",
      "license": "CC BY-SA 4.0"
    },
    "dupont-delrin-500p": {
      "title": "Delrin 500P NC010, DuPont Performance Polymers technical data sheet",
      "id": "DuPont Delrin 500P NC010 product data sheet, hosted by Protolabs",
      "url": "https://Protolabs.com/media/1022598/delrin-500p_nc010.pdf",
      "kind": "datasheet",
      "license": "manufacturer datasheet, linked not reproduced"
    },
    "mdc-hostaform-c2521": {
      "title": "Hostaform C 2521, Material Data Center typical properties",
      "id": "Material Data Center trade name entry, Celanese Hostaform C 2521",
      "url": "https://materialdatacenter.com/ms/en/Hostaform/Celanese/HOSTAFORM%C2%AE+C+2521/e3040fc5/2434",
      "kind": "database",
      "license": "third-party database page, linked not reproduced"
    },
    "mdc-hostaform-c13021fc": {
      "title": "Hostaform C 13021 FC, Material Data Center typical properties",
      "id": "Material Data Center trade name entry, Celanese Hostaform C 13021 FC",
      "url": "https://materialdatacenter.com/ms/zh/Hostaform/Celanese/HOSTAFORM%C2%AE+C+13021+FC/9f8f323b/2434",
      "kind": "database",
      "license": "third-party database page, linked not reproduced"
    },
    "nasa-tm-2008-215490": {
      "title": "Atomic Oxygen Erosion Yield Predictive Tool for Spacecraft Polymers in Low Earth Orbit",
      "id": "NASA/TM-2008-215490 (Banks, Backus and de Groh, 2008), NTRS 20090011780",
      "url": "https://ntrs.nasa.gov/citations/20090011780",
      "year": 2008,
      "kind": "report",
      "license": "NASA public document"
    },
    "pubchem-formaldehyde": {
      "title": "Formaldehyde (CID 712), PubChem compound record: GHS classification and methods of manufacture",
      "id": "PubChem CID 712, formaldehyde, CAS 50-00-0 (read via the PubChem REST pug_view API)",
      "url": "https://pubchem.ncbi.nlm.nih.gov/compound/712",
      "kind": "database",
      "license": "public database record, linked not reproduced"
    },
    "dupont-delrin-design-guide": {
      "title": "DELRIN acetal resin design information, DuPont (chemical resistance, weathering, grade list)",
      "id": "DuPont DELRIN design information PDF, hosted at spacematdb.com",
      "url": "https://www.spacematdb.com/spacemat/manudatasheets/Delrin%20design%20info.pdf",
      "kind": "handbook",
      "license": "manufacturer design guide, linked not reproduced"
    },
    "delrin-tds-laminatedplastics": {
      "title": "Delrin (acetal homopolymer) POM technical data sheet",
      "id": "Delrin acetal homopolymer technical data sheet, hosted on laminatedplastics.com",
      "url": "https://laminatedplastics.com/delrin.pdf",
      "kind": "datasheet",
      "license": "manufacturer datasheet, linked not reproduced"
    },
    "alro-acetal-catalog": {
      "title": "Acetal copolymer and homopolymer, Alro Plastics catalogue section",
      "id": "Alro Plastics plastics reference catalogue, acetal section (PDF)",
      "url": "https://www.alro.com/Resources/WebResources/AlroCom/PlasticsReferanceCatalog/PDFs/002-Acetals.pdf",
      "kind": "web",
      "license": "distributor catalogue, linked not reproduced"
    },
    "daicel-history": {
      "title": "DAICEL corporate history: Polyplastics joint venture (1964) and wholly owned subsidiary (2020)",
      "id": "DAICEL company history page",
      "url": "https://www.daicel.com/en/corporate/history/",
      "kind": "web",
      "license": "company web page, linked not reproduced"
    }
  },
  "license": "CC-BY-4.0",
  "url": "https://spacemushroom.com/profiles/pom-delrin/"
}