{
  "spore": "profile",
  "id": "nbr-nitrile",
  "spore_version": "0.2",
  "family": "elastomers",
  "name": "Nitrile rubber (NBR, Buna-N)",
  "abbreviation": "NBR",
  "role": "Seal, O-ring and hose elastomer for oil, fuel and hydraulic service",
  "category": "seals-adhesives",
  "type": "elastomers-and-o-rings",
  "summary": "Nitrile rubber (NBR, also called Buna-N) is a synthetic rubber derived from acrylonitrile and butadiene (Wikipedia). Two compound data sheets were read. A black, sulphur cross-linked 70 NBR compound from Freudenberg has a nominal hardness of 70 ±5 Shore A and a nominal tensile strength above 12 MPa. A black Parker compound has a hardness of 89 Shore A (specification 90 ±5) and a tensile strength of 2758 psi (ASTM D412). In Parker's test, the Parker compound's tensile strength changed by -56 % after 70 hours in IRM 903 oil at 257 °F.\n",
  "best_for": "Seals and O-rings in aliphatic hydrocarbon fuels, mineral oils, greases and HFA, HFB and HFC hydraulic fluids (Parker, Not Recommended list read)",
  "weakest_at": "Aromatic fuels, ketones, glycols, ozone and weathering. Parker lists these as not recommended, and the Parker compound's tensile strength changed by -56 % in IRM 903 oil at 257 °F.",
  "identity": {
    "formula": "Copolymer of acrylonitrile (ACN) and butadiene. Wikipedia gives the ratio as a grade choice, and says most applications needing both solvent resistance and low-temperature flexibility use an ACN content of 33 %.",
    "designations": [],
    "source": "wikipedia-nitrile-rubber",
    "where": "Lead section (definition of NBR as derived from acrylonitrile and butadiene); section on composition (ACN content of 33 %)"
  },
  "tags": {
    "environments": [],
    "stresses": [
      "extreme-heat",
      "extreme-cold"
    ],
    "applications": [
      "mechanisms",
      "propulsion-and-tanks"
    ]
  },
  "properties": [
    {
      "benchmark": "hardness",
      "label": "Hardness, Parker compound (ASTM D2240)",
      "value": 89,
      "bound": "exact",
      "unit": "Shore A, pts",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black, Parker report LTR 43883",
        "test": "ASTM D2240",
        "specification": "90 ±5 as printed"
      },
      "method": "Test result printed in the Parker compound data sheet, original physical properties table",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, Original Physical Properties, Hardness row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "hardness",
      "label": "Hardness, FST 70 NBR S1OR71NB (DIN ISO 7619-1)",
      "value": 70,
      "bound": "exact",
      "unit": "Shore A",
      "scope": "material",
      "conditions": {
        "compound": "70 NBR S1OR71NB, black, sulphur cross-linked",
        "test": "DIN ISO 7619-1",
        "basis": "nominal range printed as 70 ±5; the typical value column is blank"
      },
      "method": "Nominal range printed on the Freudenberg material data sheet; the sheet says values come from 2 mm laboratory sheets",
      "status": "ground",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, Physical Properties table, Hardness row",
      "source_detail": {
        "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
        "id": "Version 08, released 03.06.2026; print date 23.06.2026",
        "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "supplier data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "ultimate_tensile_strength",
      "label": "Tensile strength, Parker compound (ASTM D412)",
      "value": 2758,
      "bound": "exact",
      "unit": "psi",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "test": "ASTM D412",
        "specification": "2500 minimum as printed"
      },
      "method": "Test result printed in the Parker compound data sheet, original physical properties table",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, Original Physical Properties, Tensile Strength row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "ultimate_tensile_strength",
      "label": "Tensile strength, FST 70 NBR S1OR71NB (ISO 37)",
      "value": 12,
      "bound": "lower",
      "unit": "MPa",
      "scope": "material",
      "conditions": {
        "compound": "70 NBR S1OR71NB, black",
        "test": "ISO 37",
        "basis": "nominal range printed as greater than 12 MPa; the typical value column is blank"
      },
      "method": "Nominal range printed on the Freudenberg material data sheet",
      "status": "ground",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, Physical Properties table, Tensile strength ISO 37 row",
      "source_detail": {
        "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
        "id": "Version 08, released 03.06.2026; print date 23.06.2026",
        "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "supplier data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "elongation",
      "label": "Ultimate elongation, Parker compound (ASTM D412)",
      "value": 103,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "test": "ASTM D412",
        "specification": "80 minimum as printed"
      },
      "method": "Test result printed in the Parker compound data sheet, original physical properties table",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, Original Physical Properties, Ultimate Elongation row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "elongation",
      "label": "Elongation at break, FST 70 NBR S1OR71NB (ISO 37)",
      "value": 250,
      "bound": "lower",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "70 NBR S1OR71NB, black",
        "test": "ISO 37",
        "basis": "nominal range printed as greater than 250 %; the typical value column is blank"
      },
      "method": "Nominal range printed on the Freudenberg material data sheet",
      "status": "ground",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, Physical Properties table, Elongation at break ISO 37 row",
      "source_detail": {
        "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
        "id": "Version 08, released 03.06.2026; print date 23.06.2026",
        "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "supplier data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "modulus_100_percent",
      "label": "Modulus at 100 % elongation, Parker compound (ASTM D412)",
      "value": 2565,
      "bound": "exact",
      "unit": "psi",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "test": "ASTM D412",
        "specification": "report only, as printed"
      },
      "method": "Test result printed in the Parker compound data sheet, original physical properties table",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, Original Physical Properties, Modulus at 100 % Elongation row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "specific_gravity",
      "label": "Specific gravity, Parker compound (ASTM D297)",
      "value": 1.29,
      "bound": "exact",
      "unit": "-",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "test": "ASTM D297",
        "specification": "report only, as printed",
        "temperature": "not printed"
      },
      "method": "Test result printed as specific gravity; not converted to a density",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, Original Physical Properties, Specific Gravity row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "compression_set",
      "label": "Compression set, 22 h at 257 °F (Parker compound, ASTM D395 method B)",
      "value": 18,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "test": "ASTM D395 method B",
        "time": "22 hours",
        "temperature": "257 °F",
        "basis": "percent of original deflection, maximum, as printed"
      },
      "method": "Test result printed in the Parker compound data sheet, compression set block",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, Compression Set, 22 hrs at 257 °F row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "compression_set",
      "label": "Compression set, 22 h at 350 °F (Parker compound, ASTM D395 method B)",
      "value": 37,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "test": "ASTM D395 method B",
        "time": "22 hours",
        "temperature": "350 °F",
        "basis": "percent of original deflection, maximum, as printed"
      },
      "method": "Test result printed in the Parker compound data sheet, compression set block",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, Compression Set, 22 hrs at 350 °F row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "compression_set",
      "label": "Compression set, 72 h at 100 °C (FST 70 NBR, DIN ISO 815 method B)",
      "value": 40,
      "bound": "upper",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "70 NBR S1OR71NB, black",
        "test": "DIN ISO 815, method B",
        "time": "72 hours",
        "temperature": "100 °C",
        "basis": "nominal range printed as less than 40 %; the typical value column is blank"
      },
      "method": "Nominal range printed on the Freudenberg material data sheet",
      "status": "ground",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, Physical Properties table, Compression set row",
      "source_detail": {
        "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
        "id": "Version 08, released 03.06.2026; print date 23.06.2026",
        "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "supplier data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "low_temperature_tr10",
      "label": "Low temperature, TR10 (FST 70 NBR S1OR71NB, ISO 2921)",
      "value": -20,
      "bound": "upper",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "compound": "70 NBR S1OR71NB, black",
        "test": "ISO 2921, TR10",
        "basis": "nominal range printed as less than -20 °C"
      },
      "method": "Nominal range printed on the Freudenberg material data sheet",
      "status": "ground",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, Physical Properties table, Low temperature ISO 2921 TR10 row",
      "source_detail": {
        "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
        "id": "Version 08, released 03.06.2026; print date 23.06.2026",
        "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "supplier data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "max_service_temp",
      "label": "Recommended upper temperature, Parker compound",
      "value": 275,
      "bound": "exact",
      "unit": "°F",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "basis": "recommended temperature range printed in the report, not a test limit"
      },
      "method": "Recommended range printed in the Parker compound data sheet",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 1 of 2, Recommended Temperature Range row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "min_service_temp",
      "label": "Recommended lower temperature, Parker compound",
      "value": -30,
      "bound": "exact",
      "unit": "°F",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "basis": "recommended temperature range printed in the report, not a test limit"
      },
      "method": "Recommended range printed in the Parker compound data sheet",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 1 of 2, Recommended Temperature Range row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "max_service_temp",
      "label": "Static temperature range, upper limit, FST 70 NBR S1OR71NB",
      "value": 100,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "compound": "70 NBR S1OR71NB, black",
        "basis": "static use, as printed in the Temperature Range block"
      },
      "method": "Range printed on the Freudenberg material data sheet",
      "status": "ground",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, Temperature Range, static row",
      "source_detail": {
        "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
        "id": "Version 08, released 03.06.2026; print date 23.06.2026",
        "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "supplier data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "min_service_temp",
      "label": "Static temperature range, lower limit, FST 70 NBR S1OR71NB",
      "value": -30,
      "bound": "exact",
      "unit": "°C",
      "scope": "material",
      "conditions": {
        "compound": "70 NBR S1OR71NB, black",
        "basis": "static use, as printed in the Temperature Range block"
      },
      "method": "Range printed on the Freudenberg material data sheet",
      "status": "ground",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, Temperature Range, static row",
      "source_detail": {
        "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
        "id": "Version 08, released 03.06.2026; print date 23.06.2026",
        "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
        "year": 2026,
        "kind": "datasheet",
        "license": "supplier data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "fluid_tensile_strength_change",
      "label": "Tensile strength change after IRM 903 oil, Parker compound",
      "value": -56,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "fluid": "IRM 903",
        "time": "70 hours",
        "temperature": "257 °F"
      },
      "method": "Change printed in the IRM 903 block of the Parker compound data sheet",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, IRM 903 block, Tensile Strength Change row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "fluid_ultimate_elongation_change",
      "label": "Ultimate elongation change after IRM 903 oil, Parker compound",
      "value": -31,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "fluid": "IRM 903",
        "time": "70 hours",
        "temperature": "257 °F"
      },
      "method": "Change printed in the IRM 903 block of the Parker compound data sheet",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, IRM 903 block, Ultimate Elongation Change row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "fluid_volume_change",
      "label": "Volume change after IRM 903 oil, Parker compound",
      "value": 10,
      "bound": "exact",
      "unit": "%",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "fluid": "IRM 903",
        "time": "70 hours",
        "temperature": "257 °F",
        "sign_as_printed": "+10"
      },
      "method": "Change printed in the IRM 903 block of the Parker compound data sheet",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, IRM 903 block, Volume Change row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    },
    {
      "benchmark": "fluid_hardness_change",
      "label": "Hardness change after IRM 903 oil, Parker compound (ASTM D471)",
      "value": -2,
      "bound": "exact",
      "unit": "pts",
      "scope": "material",
      "conditions": {
        "compound": "Parker compound, black",
        "fluid": "IRM 903",
        "test": "ASTM D471",
        "time": "70 hours",
        "temperature": "257 °F"
      },
      "method": "Change printed in the IRM 903 block of the Parker compound data sheet",
      "status": "ground",
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, IRM 903 block, Hardness Change row",
      "source_detail": {
        "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
        "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
        "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
        "year": 2006,
        "kind": "datasheet",
        "license": "manufacturer data sheet, linked not reproduced"
      }
    }
  ],
  "corrosion": [
    {
      "environment": "Immersion in IRM 903 oil, 70 hours at 257 °F (Parker compound)",
      "headline": "In IRM 903 oil at 257 °F for 70 hours, the Parker compound's tensile strength changed by -56 % and its elongation by -31 %.",
      "effect": "The same test gave a volume change of +10 % and a hardness change of -2 pts. The report gives these changes for one compound and one oil only; it gives no service life.",
      "rating": "severe",
      "conditions": {
        "fluid": "IRM 903 oil",
        "time": "70 hours",
        "temperature": "257 °F",
        "test": "ASTM D471 (as printed on the hardness-change row)"
      },
      "source": "parker-ltr-43883",
      "where": "Page 2 of 2, IRM 903 block"
    },
    {
      "environment": "Aromatic hydrocarbons, benzene, chlorinated solvents, strong acids, glycols, ketones and other polar solvents",
      "headline": "Parker lists these fluids as not recommended for this NBR compound.",
      "effect": "The Not Recommended For block lists fuels of high aromatic content, aromatic hydrocarbons (benzene), chlorinated hydrocarbons (trichloroethylene), strong acids, glycols and polar solvents (ketone, acetone, acetic acid, ethylene-ester). No test result for any of these fluids is printed on the report.",
      "rating": "unknown",
      "conditions": {
        "basis": "list in the Parker report; no test data for these fluids"
      },
      "source": "parker-ltr-43883",
      "where": "Page 1 of 2, Not Recommended For block"
    },
    {
      "environment": "Ozone, weather and atmospheric ageing",
      "headline": "Parker lists ozone, weather and atmospheric ageing as not recommended for this compound.",
      "effect": "Neither data sheet prints an ozone or weathering result. The Parker list is the only statement about these exposures in the sources read.",
      "rating": "unknown",
      "conditions": {
        "basis": "list statement in the Parker report; no test result"
      },
      "source": "parker-ltr-43883",
      "where": "Page 1 of 2, Not Recommended For block"
    },
    {
      "environment": "Mineral oils, aliphatic hydrocarbon fuels, vegetable oils, salt and alkali solutions, dilute acids, and HFA, HFB and HFC hydraulic fluids",
      "headline": "Parker lists these as recommended for this NBR compound; no test result is printed for them.",
      "effect": "The Recommended For block names aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils), vegetable oils, mineral oils, greases, HFA, HFB and HFC hydraulic fluids, salt and alkali solutions, and dilute acids.",
      "rating": "low",
      "conditions": {
        "basis": "recommendation statement in the Parker report"
      },
      "source": "parker-ltr-43883",
      "where": "Page 1 of 2, Recommended For block"
    },
    {
      "environment": "General NBR in oil, fuel and other chemicals across its stability range",
      "headline": "Wikipedia says NBR is resistant to oil, fuel and other chemicals, and gives its stability range as -40 to 108 °C.",
      "effect": "The article states that NBR is unusual in being resistant to oil, fuel and other chemicals, and gives its stability range as -40 to 108 °C. It names no grade or test conditions, so the range is a general statement about NBR and not a rating for the compounds above.",
      "rating": "unknown",
      "conditions": {
        "basis": "general statement in the article; no test condition given"
      },
      "source": "wikipedia-nitrile-rubber",
      "where": "Section on temperature range and oil resistance"
    }
  ],
  "risks": {
    "hazards": [
      {
        "text": "Monomer acrylonitrile (PubChem CID 7855, ECHA aggregate): signal word \"Danger\". The most-notified statements are \"Highly Flammable liquid and vapor\" (H225), \"Toxic if swallowed\" (H301), \"Toxic in contact with skin\" (H311), \"Causes serious eye damage\" (H318), \"Toxic if inhaled\" (H331) and \"May cause cancer\" (H350). NBR itself was not classified in any source read.",
        "ghs": [
          "H225",
          "H301",
          "H311",
          "H318",
          "H331",
          "H350"
        ],
        "source": "pubchem-acrylonitrile",
        "where": "Safety and Hazards, GHS Classification (CID 7855), ECHA aggregate block"
      },
      {
        "text": "Monomer 1,3-butadiene (PubChem CID 7845, ECHA aggregate): signal word \"Danger\". The statements are \"Extremely flammable gas\" (H220), \"Contains gas under pressure; may explode if heated\" (H280), \"May cause genetic defects\" (H340) and \"May cause cancer\" (H350). NBR itself was not classified in any source read.",
        "ghs": [
          "H220",
          "H280",
          "H340",
          "H350"
        ],
        "source": "pubchem-butadiene",
        "where": "Safety and Hazards, GHS Classification (CID 7845), ECHA aggregate block"
      },
      {
        "text": "Acrylonitrile exposure limits (NIOSH Pocket Guide, CAS 107-13-1): the NIOSH REL is \"Ca TWA 1 ppm C 10 ppm [15-minute] [skin]\" and the IDLH is \"Ca [60 ppm]\". Exposure routes are \"inhalation, skin absorption, ingestion, skin and/or eye contact\". Target organs are \"Eyes, skin, cardiovascular system, liver, kidneys, central nervous system\".",
        "ghs": [],
        "source": "niosh-acrylonitrile",
        "where": "Exposure limits, IDLH, Exposure routes and Health hazards blocks of Pocket Guide entry npgd0014"
      },
      {
        "text": "Acrylonitrile regulation (ATSDR Toxicological Profile, Table 7-1): the HHS carcinogenicity classification is \"Reasonably anticipated to be a human carcinogen\", and the OSHA PEL (8-hour TWA) for general industry is \"2 ppm\".",
        "ghs": [],
        "source": "atsdr-acrylonitrile",
        "where": "Chapter 7, Table 7-1, Carcinogenicity and Occupational rows"
      }
    ],
    "failure_risks": [
      {
        "mode": "Swelling and strength loss in aromatic or polar fluids",
        "trigger": "Exposure to high-aromatic fuels, benzene, ketones or other polar solvents, which Parker lists as not recommended",
        "consequence": "No test result is printed for these fluids. In IRM 903 oil at 257 °F for 70 hours, the Parker compound's tensile strength changed by -56 % and its volume by +10 %.",
        "severity": "high",
        "source": "parker-ltr-43883",
        "where": "Not Recommended For block; IRM 903 block"
      },
      {
        "mode": "Ageing from ozone and weather",
        "trigger": "Ozone, weather and atmospheric exposure",
        "consequence": "Parker lists these as not recommended. No ageing result is printed in either data sheet.",
        "severity": "moderate",
        "source": "parker-ltr-43883",
        "where": "Not Recommended For block"
      },
      {
        "mode": "Permanent set after heat exposure",
        "trigger": "Compression under heat: 22 hours at 257 °F, 22 hours at 350 °F, or 72 hours at 100 °C",
        "consequence": "The Parker compound took a permanent set of 18 % at 257 °F and 37 % at 350 °F (ASTM D395 method B). The FST 70 NBR nominal limit is less than 40 % at 72 hours and 100 °C.",
        "severity": "moderate",
        "source": "parker-ltr-43883",
        "where": "Page 2 of 2, Compression Set rows"
      }
    ],
    "side_effects": [],
    "handling": [],
    "mitigations": [
      {
        "text": "Keep service within the recommended range printed by each source: -30 to 275 °F for the Parker compound, and -30 to 100 °C static for the FST 70 NBR compound.",
        "source": "parker-ltr-43883",
        "where": "Page 1 of 2, Recommended Temperature Range; FST Temperature Range block"
      }
    ]
  },
  "uses": [
    {
      "application": "propulsion-and-tanks",
      "device": "Seals for fuel and oil handling",
      "example": "Parker lists aliphatic hydrocarbons such as propane, butane, petroleum oil, diesel fuel and fuel oils as recommended for this NBR compound. Wikipedia names fuel and oil handling hoses, seals, grommets and self-sealing fuel tanks as NBR uses.",
      "source": "parker-ltr-43883",
      "where": "Recommended For block, page 1 of 2"
    },
    {
      "application": "mechanisms",
      "device": "O-ring seals in hydraulic and grease-lubricated mechanisms",
      "example": "Parker lists mineral oils, greases, and HFA, HFB and HFC hydraulic fluids as recommended for this compound.",
      "source": "parker-ltr-43883",
      "where": "Recommended For block, page 1 of 2"
    },
    {
      "application": "mechanisms",
      "device": "Fluid power O-rings (nominal ranges set against ISO 3601-5)",
      "example": "The FST 70 NBR data sheet gives its nominal ranges on the basis of ISO 3601-5, the specification for elastomeric O-ring materials in industrial fluid power, and lists a static range of -30 to 100 °C.",
      "source": "fst-nbr-70",
      "where": "Page 1 of 3, note below the Physical Properties table; Temperature Range block"
    },
    {
      "application": "propulsion-and-tanks",
      "device": "Self-sealing fuel tanks and fuel lines",
      "example": "Wikipedia names self-sealing fuel tanks among the automotive and aeronautical uses of NBR, with hoses, seals and grommets.",
      "source": "wikipedia-nitrile-rubber",
      "where": "Section on applications (automotive and aeronautical)"
    }
  ],
  "supply": [
    {
      "subject": "Nitrile rubber (NBR), ARLANXEO-TSRC plant",
      "producers": [
        {
          "country": "China",
          "year": 2025
        }
      ],
      "critical_lists": [],
      "substitutes": [],
      "source": "arlanxeo-nantong-2025",
      "where": "Nantong, Jiangsu Province, China: ARLANXEO-TSRC (Nantong) Chemical Industrial Co. Ltd., a joint venture, press release dated May 16, 2025. Designed capacity increased to 40,000 tons per annum. No share of world output was printed."
    },
    {
      "subject": "Nitrile rubber (NBR), Zeon Tokuyama plant",
      "producers": [
        {
          "country": "Japan",
          "year": 2010
        }
      ],
      "critical_lists": [],
      "substitutes": [],
      "source": "zeon-tokuyama-2010",
      "where": "Tokuyama, Japan: Zeon Corp. NBR capacity raised to 55,000 metric tons a year from 45,000 tons, article dated 21 Jan 2010. The article is dated, and the current capacity was not read."
    }
  ],
  "media": [],
  "documents": [
    {
      "title": "Parker O-Ring Division, Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883 (2006)",
      "type": "datasheet",
      "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
      "year": 2006
    },
    {
      "title": "Freudenberg Industrial Services, Material data sheet 70 NBR S1OR71NB, version 08",
      "type": "datasheet",
      "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
      "year": 2026
    },
    {
      "title": "NIST Atomic Weights and Isotopic Compositions for All Elements (N, C and H)",
      "type": "database",
      "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=N&all=all&ascii=html",
      "year": 2026
    },
    {
      "title": "PubChem, Acrylonitrile (CID 7855), Safety and Hazards, GHS Classification",
      "type": "database",
      "url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/7855/JSON?heading=GHS+Classification"
    },
    {
      "title": "PubChem, 1,3-Butadiene (CID 7845), Safety and Hazards, GHS Classification",
      "type": "database",
      "url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/7845/JSON?heading=GHS+Classification"
    },
    {
      "title": "NIOSH Pocket Guide to Chemical Hazards, Acrylonitrile (npgd0014)",
      "type": "report",
      "url": "https://www.cdc.gov/niosh/npg/npgd0014.html"
    },
    {
      "title": "ATSDR Toxicological Profile for Acrylonitrile, Chapter 7 (Regulations and Guidelines)",
      "type": "report",
      "url": "https://www.atsdr.cdc.gov/toxprofiles/tp125-c7.pdf"
    }
  ],
  "gaps": [
    "No CAS number, UNS, EN, DIN, ASTM or trade-name designation was printed for this NBR grade in any source read in this run, so designations are empty.",
    "No world production share, USGS entry or critical-mineral entry for NBR, acrylonitrile or butadiene was read. Supply lists two producer plants with printed capacities, from a 2025 manufacturer press release and a 2010 trade article; these are not a market share.",
    "No GHS classification or safety data sheet for NBR itself was read. The hazard entries use PubChem's GHS aggregate and the NIOSH and ATSDR entries for the monomers acrylonitrile and 1,3-butadiene, and say so; they are not hazard data for NBR.",
    "A CDC IDLH page that appeared in search gave a different IDLH for acrylonitrile (85 ppm). That page was not fetched, so the value is not recorded; the NIOSH entry read gives Ca [60 ppm].",
    "No handling, storage or dust guidance was read for NBR, so risks.handling is empty.",
    "No outgassing (total mass loss, collected volatile condensable material) or vacuum, radiation, atomic oxygen or thermal-cycling data for NBR was read in this run.",
    "No glass transition temperature, density of a named grade, or heat-ageing retention of tensile strength or elongation was printed in the sources read. Wikipedia gives a general compounded density of about 1.00 g/cm3 without a grade or test method; it is not recorded.",
    "The Parker and Freudenberg compounds are different products with different test methods, so their values are not directly comparable. The Parker recommended range (-30 to 275 °F) and the FST static range (-30 to 100 °C) are both recorded, and they are not reconciled.",
    "No FKM, EPDM or silicone comparison values were read in this run, so the compare paragraph is qualitative.",
    "Property names not in property-canon.yaml: hardness, compression_set, modulus_100_percent, low_temperature_tr10, fluid_tensile_strength_change, fluid_ultimate_elongation_change, fluid_volume_change and fluid_hardness_change. Shore A hardness and ISO 37 results are kept under the names printed in each source.",
    "The PubChem record for nitrile rubber itself returned a captcha page, so no PubChem entry for NBR is cited. The sources are listed under sources; the NBR-specific data come from the two compound data sheets and Wikipedia.",
    "No image or media file is attached to this profile."
  ],
  "story": {
    "why": "Nitrile rubber (NBR, Buna-N) is a synthetic rubber derived from acrylonitrile and butadiene. Its acrylonitrile content sets the balance between oil and fuel resistance and low-temperature flexibility. Two compound data sheets read for this profile show the rubber is used where oils and fuels must be sealed. Wikipedia names fuel and oil handling hoses, seals, grommets and self-sealing fuel tanks as its main automotive and aeronautical uses.",
    "uses": [
      {
        "where": "Fuel and oil seals",
        "line": "Parker lists aliphatic hydrocarbons, including propane, butane, petroleum oil, diesel fuel and fuel oils, as recommended for its black NBR compound."
      },
      {
        "where": "Hydraulic and grease service",
        "line": "The same report lists mineral oils, greases and HFA, HFB and HFC hydraulic fluids as recommended. The FST 70 NBR data sheet gives nominal ranges on the basis of ISO 3601-5, the specification for elastomeric O-ring materials in industrial fluid power."
      },
      {
        "where": "Fuel tanks and hoses",
        "line": "Wikipedia says NBR is used for fuel and oil handling hoses, seals, grommets and self-sealing fuel tanks."
      }
    ],
    "can_do": [
      {
        "label": "Hardness",
        "line": "The Parker compound measured 89 Shore A against a specification of 90 ±5 (ASTM D2240). The FST 70 NBR S1OR71NB has a nominal hardness of 70 ±5 Shore A (DIN ISO 7619-1).",
        "benchmark": "hardness",
        "scope": "material",
        "value": "89 Shore A (Parker compound), 70 ±5 Shore A (FST nominal)"
      },
      {
        "label": "Strength",
        "line": "The Parker compound's tensile strength is 2758 psi (ASTM D412), against a minimum of 2500 psi. The FST compound's nominal tensile strength is above 12 MPa (ISO 37).",
        "benchmark": "ultimate_tensile_strength",
        "scope": "material",
        "value": "2758 psi (Parker compound)"
      },
      {
        "label": "Low temperature",
        "line": "The FST 70 NBR compound's nominal TR10 low-temperature value is less than -20 °C (ISO 2921).",
        "benchmark": "low_temperature_tr10",
        "scope": "material",
        "value": "less than -20 °C (TR10)"
      },
      {
        "label": "Oil resistance",
        "line": "After 70 hours in IRM 903 oil at 257 °F, the Parker compound's tensile strength changed by -56 %, its elongation by -31 % and its volume by +10 %.",
        "benchmark": "fluid_tensile_strength_change",
        "scope": "material",
        "value": "-56 % in IRM 903 oil"
      }
    ],
    "compare": "NBR is used where aliphatic fuels, mineral oils and hydraulic fluids must be sealed, and the two data sheets read here show a recommended upper limit of 275 °F for the Parker compound and 100 °C static for the FST compound. Parker's list shows that NBR is not recommended for aromatic fuels, ketones and ozone, so an oil-resistant seal in those services needs a different elastomer; this profile does not read a comparison value for the other elastomers in the set.",
    "compare_rows": [
      {
        "label": "Hardness",
        "benchmark": "hardness",
        "scope": "material"
      },
      {
        "label": "Tensile strength",
        "benchmark": "ultimate_tensile_strength",
        "scope": "material"
      },
      {
        "label": "Upper service temperature",
        "benchmark": "max_service_temp",
        "scope": "material"
      }
    ],
    "handling": [
      "Confirm the grade and compound with the supplier before use, since the Parker and FST compounds differ in their limits.",
      "Keep service within the printed range: -30 to 275 °F for the Parker compound, and -30 to 100 °C static for the FST compound.",
      "Do not use NBR in aromatic fuels, ketones or outdoors in ozone and weather, since Parker lists these as not recommended."
    ],
    "good_for": [
      "Oil and fuel seals: Parker lists aliphatic fuels, mineral oils, greases and HFA, HFB and HFC hydraulic fluids as recommended.",
      "Fluid power O-rings: FST gives nominal ranges on the basis of ISO 3601-5.",
      "Hardness control: the two compounds read sit at 70 and 89 Shore A, against a specification of 90 ±5 for the Parker compound."
    ],
    "watch_out": [
      "Aromatic fuels, benzene, ketones and polar solvents: Parker lists these as not recommended, with no test result printed.",
      "Ozone and weather: Parker lists these as not recommended for atmospheric ageing.",
      "Heat set: 18 % after 22 hours at 257 °F and 37 % after 22 hours at 350 °F for the Parker compound.",
      "No outgassing or radiation data for NBR were read, so this profile gives no space-vacuum result."
    ],
    "verdict": "NBR suits seals in aliphatic fuels, mineral oils and hydraulic fluids, and both data sheets read here give a clear operating range. The sources read do not cover ozone, weathering or space exposure, so those limits are not recorded as values.",
    "recipe": {
      "line": "Nitrile rubber is a copolymer of acrylonitrile and butadiene. Wikipedia says water serves as the reaction medium in the production vessel. The FST 70 NBR S1OR71NB compound is sulphur cross-linked, as its data sheet prints under Type of cross-linking. The acrylonitrile content sets the balance between oil resistance and low-temperature flexibility; Wikipedia gives 33 % as the figure for most applications that need both.",
      "parts": [
        {
          "name": "Carbon",
          "symbol": "C",
          "role": "The carbon backbone of both monomers, acrylonitrile and butadiene.",
          "share_note": "atomic_weight [12.0096, 12.0116]"
        },
        {
          "name": "Hydrogen",
          "symbol": "H",
          "role": "Hydrogen on the butadiene and acrylonitrile units; the rubber has a hydrocarbon backbone.",
          "share_note": "atomic_weight [1.007 84, 1.008 11]"
        },
        {
          "name": "Nitrogen",
          "symbol": "N",
          "role": "Carried by the nitrile group (C≡N) of the acrylonitrile units. More acrylonitrile raises oil resistance and stiffens the rubber at low temperature.",
          "share_note": "atomic_weight [14.006 43, 14.007 28]"
        }
      ]
    },
    "risk_groups": [
      {
        "title": "For people",
        "lead": "No safety data sheet for NBR itself was read, so the points below are for the two monomers it is made from, acrylonitrile and 1,3-butadiene.",
        "points": [
          {
            "label": "Acrylonitrile",
            "line": "PubChem ECHA aggregate gives the signal word \"Danger\" and lists toxic if swallowed, toxic in contact with skin, toxic if inhaled, causes serious eye damage and may cause cancer. NIOSH gives the REL as \"Ca TWA 1 ppm C 10 ppm [15-minute] [skin]\"."
          },
          {
            "label": "1,3-butadiene",
            "line": "PubChem ECHA aggregate gives the signal word \"Danger\" and lists extremely flammable gas, may cause genetic defects and may cause cancer."
          }
        ],
        "level": 0,
        "verdict": "Monomer hazards only"
      },
      {
        "title": "If it fails",
        "lead": "The failure routes in these sources are fluid attack, ozone and weathering, and heat-set. Each is tied to a printed result or a printed Parker limit.",
        "points": [
          {
            "label": "Aromatic and polar fluids",
            "line": "Parker lists high-aromatic fuels, benzene, ketones and similar solvents as not recommended. In IRM 903 oil at 257 °F for 70 hours, the Parker compound's tensile strength changed by -56 % and its elongation by -31 %."
          },
          {
            "label": "Ozone and weather",
            "line": "Parker lists ozone, weather and atmospheric ageing as not recommended. No ageing result is printed."
          },
          {
            "label": "Heat set",
            "line": "The Parker compound took a permanent set of 18 % after 22 hours at 257 °F and 37 % after 22 hours at 350 °F."
          }
        ]
      }
    ]
  },
  "updated": "2026-11-01",
  "review": {
    "status": "draft",
    "method": "assistant",
    "checked_values": 20,
    "unreachable": 2,
    "caveats": 3,
    "note": "Read by an AI assistant on 2026-11-01 from the Parker LTR 43883 data sheet, the Freudenberg 70 NBR S1OR71NB data sheet, the Wikipedia article and NIST atomic weights. Unreachable: PubChem nitrile rubber record (captcha) and a Parker O-ring handbook URL that was not a PDF. Caveats: the Parker values are for one black compound with no test standard printed for some rows; the FST values are nominal ranges from 2 mm laboratory sheets; the recommended temperature ranges are not test limits."
  },
  "sources": {
    "parker-ltr-43883": {
      "title": "Compound Data Sheet: Evaluation of Parker Compound, Material Report LTR 43883",
      "id": "Parker O-Ring Division LTR Report Number 43883, dated 10/3/2006",
      "url": "https://www.marcorubber.com/downloads/Marco-Material-Datasheet-Parker-NB194-90.pdf",
      "year": 2006,
      "kind": "datasheet",
      "license": "manufacturer data sheet, linked not reproduced"
    },
    "fst-nbr-70": {
      "title": "Freudenberg Industrial Services material data sheet, 70 NBR S1OR71NB",
      "id": "Version 08, released 03.06.2026; print date 23.06.2026",
      "url": "https://products.fst.com/medialibrary/materialdatasheets/70%20NBR%20S1OR71NB_en.pdf",
      "year": 2026,
      "kind": "datasheet",
      "license": "supplier data sheet, linked not reproduced"
    },
    "wikipedia-nitrile-rubber": {
      "title": "Nitrile rubber, Wikipedia",
      "id": "Lead, composition, applications and temperature range sections",
      "url": "https://en.wikipedia.org/wiki/Nitrile_rubber",
      "kind": "web",
      "license": "CC BY-SA 4.0, linked not reproduced"
    },
    "nist-atomic-weights": {
      "title": "NIST Atomic Weights and Isotopic Compositions for All Elements (N, C and H rows)",
      "id": "NIST standard atomic weights: C [12.0096, 12.0116]; H [1.007 84, 1.008 11]; N [14.006 43, 14.007 28]",
      "url": "https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=N&all=all&ascii=html",
      "kind": "database",
      "license": "US government data"
    },
    "pubchem-acrylonitrile": {
      "title": "PubChem, Acrylonitrile (CID 7855), Safety and Hazards, GHS Classification",
      "id": "PubChem CID 7855, ECHA aggregated GHS classification block",
      "url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/7855/JSON?heading=GHS+Classification",
      "kind": "database",
      "license": "US government database, linked not reproduced"
    },
    "pubchem-butadiene": {
      "title": "PubChem, 1,3-Butadiene (CID 7845), Safety and Hazards, GHS Classification",
      "id": "PubChem CID 7845, ECHA aggregate GHS classification",
      "url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/7845/JSON?heading=GHS+Classification",
      "kind": "database",
      "license": "US government database, linked not reproduced"
    },
    "niosh-acrylonitrile": {
      "title": "NIOSH Pocket Guide to Chemical Hazards, Acrylonitrile (CAS 107-13-1)",
      "id": "NIOSH Pocket Guide entry npgd0014",
      "url": "https://www.cdc.gov/niosh/npg/npgd0014.html",
      "kind": "handbook",
      "license": "US government publication"
    },
    "atsdr-acrylonitrile": {
      "title": "ATSDR Toxicological Profile for Acrylonitrile, Chapter 7 (Regulations and Guidelines), Table 7-1",
      "id": "ATSDR tp125, chapter 7, pages 127 and 128",
      "url": "https://www.atsdr.cdc.gov/toxprofiles/tp125-c7.pdf",
      "kind": "report",
      "license": "US government publication"
    },
    "arlanxeo-nantong-2025": {
      "title": "ARLANXEO and TSRC announce the inauguration of their new joint venture NBR plant in Nantong (press release)",
      "id": "Press release, Nantong, May 16, 2025",
      "url": "https://www.arlanxeo.com/en/news-media/press-releases/ARLANXEO-and-TSRC-announce-the-inauguration-of-their-new-joint-venture-NBR-plant-in-Nantong",
      "year": 2025,
      "kind": "web",
      "license": "manufacturer press release, linked not reproduced"
    },
    "zeon-tokuyama-2010": {
      "title": "European Rubber Journal, Zeon to add nitrile capacity in Japan",
      "id": "Article dated 21 Jan 2010",
      "url": "http://www.european-rubber-journal.com/article/2080388/zeon-to-add-nitrile-capacity-in-japan",
      "year": 2010,
      "kind": "web",
      "license": "trade article, linked not reproduced"
    }
  },
  "license": "CC-BY-4.0",
  "url": "https://spacemushroom.com/profiles/nbr-nitrile/"
}