Hydrogenated nitrile rubber (HNBR) HNBR

spore: profile
id: hnbr
spore_version: 0.2
family: nitrile-elastomers
name: Hydrogenated nitrile rubber (HNBR)
abbreviation: HNBR
role: Seal and O-ring elastomer for oil, fuel and heat service
category: seals-adhesives
type: elastomers-and-o-rings
summary: Hydrogenated nitrile rubber (HNBR, also called highly saturated nitrile, HSN) is a peroxide-cured elastomer made by saturating the butadiene double bonds of nitrile rubber with hydrogen. The Global O-Ring HNBR70 test report gives a hardness of 72 Shore A, a tensile strength of 23.4 MPa and an elongation of 282 percent. Its HNBR90 test report gives 87 Shore A, 21.6 MPa and 229 percent. Both data sheets give a temperature range of -40 °C to 150 °C.
best_for: Oil and fuel seals that must run hotter than standard nitrile, up to about 150 °C (Global O-Ring data sheets and Parker handbook)
weakest_at: Chlorinated hydrocarbons, ketones, ethers, esters and strong acids, which the data sheets list as poor; no ASTM E595 outgassing data was found in this run
identity:
  formula: 'Hydrogenated nitrile rubber: a nitrile-butadiene copolymer whose butadiene double bonds are saturated with hydrogen. The sources read give no monomer ratio or hydrogenation degree.'
  source: parker-handbook
  where: Section 2.2.9 Hydrogenated Nitrile (HNBR, HSN); the saturation wording is also in the HNBR70 data sheet, General Information
tags:
  environments: []
  stresses:
    - extreme-heat
    - extreme-cold
  applications:
    - mechanisms
    - propulsion-and-tanks
properties:
  - benchmark: hardness
    label: Hardness, Shore A (70 durometer grade)
    value: 72
    unit: Shore A
    scope: material
    conditions:
      grade: 70 durometer, black, peroxide-cured
      test: ASTM D2240-15
      requirement: 70±5
    method: Test report value on the Global O-Ring HNBR70 compound report
    status: ground
    source: globaloring-hnbr70
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Hardness, Shore A row, results column
  - benchmark: ultimate_tensile_strength
    label: Tensile strength (70 durometer grade)
    value: 23.4
    unit: MPa
    scope: material
    conditions:
      grade: 70 durometer, black
      test: ASTM D412-15
      printed_psi: 3393
      requirement: min 2321 psi (16 MPa)
    method: Test report result, printed as 3393 (23.40) with psi first and MPa in brackets; the MPa figure is used here, as printed (23.40)
    status: ground
    source: globaloring-hnbr70
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Tensile Strength row, results column
  - benchmark: elongation
    label: Elongation at break (70 durometer grade)
    value: 282
    unit: '%'
    scope: material
    conditions:
      grade: 70 durometer, black
      test: ASTM D412-15
      requirement: min 250 percent
    method: Test report value on the Global O-Ring HNBR70 compound report
    status: ground
    source: globaloring-hnbr70
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Elongation, min, percent row, results column
  - benchmark: modulus_at_100_percent
    label: Modulus at 100 percent elongation (70 durometer grade)
    value: 4.9
    unit: MPa
    scope: material
    conditions:
      grade: 70 durometer, black
      test: ASTM D412-15
      printed_psi: 710
    method: Test report result, printed as 710 (4.90) psi and MPa; the MPa figure is used as printed
    status: ground
    source: globaloring-hnbr70
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Modulus at 100%, psi(MPa) row
  - benchmark: density
    label: Density (70 durometer grade)
    value: 1.18
    unit: g/cm3
    scope: material
    conditions:
      grade: 70 durometer, black
      unit_in_source: Mg/m3 (printed as Mg/m³)
      test: CNS 5341-96
    method: Test report value. Mg/m3 is the same unit as g/cm3, so the number is unchanged.
    status: ground
    source: globaloring-hnbr70
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Density row
  - benchmark: compression_set
    label: Compression set after 22 h at 150 °C (70 durometer grade)
    value: 13.1
    unit: '%'
    scope: material
    conditions:
      grade: 70 durometer, black
      test: ASTM D395-16B
      time: 22 h
      temperature: 150 °C
      requirement: max 30 percent (button)
    method: Test report result, button specimen as printed (method B)
    status: ground
    source: globaloring-hnbr70
    where: Test report, row B16, COMPRESSION SET, 22 hours at 150°C (302°F), max, percent
  - benchmark: max_service_temp
    label: Temperature range upper limit (data sheet)
    value: 150
    unit: °C
    scope: material
    conditions:
      basis: Temperature Range line of the HNBR70 data sheet, printed as -40°C (-40°F) to 150°C (302°F)
    method: Supplier data sheet value, as printed
    status: ground
    source: globaloring-hnbr70
    where: General Information, Temperature Range line
  - benchmark: min_service_temp
    label: Temperature range lower limit (data sheet)
    value: -40
    unit: °C
    scope: material
    conditions:
      basis: Temperature Range line of the HNBR70 data sheet, printed as -40°C (-40°F) to 150°C (302°F)
    method: Supplier data sheet value, as printed
    status: ground
    source: globaloring-hnbr70
    where: General Information, Temperature Range line
  - benchmark: hardness
    label: Hardness, Shore A (90 durometer grade)
    value: 87
    unit: Shore A
    scope: material
    conditions:
      grade: 90 durometer, black, peroxide-cured
      test: ASTM D2240-15
      requirement: 90±5
    method: Test report value on the Global O-Ring HNBR90 compound report
    status: ground
    source: globaloring-hnbr90
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Hardness, Shore A row, results column
  - benchmark: ultimate_tensile_strength
    label: Tensile strength (90 durometer grade)
    value: 21.6
    unit: MPa
    scope: material
    conditions:
      grade: 90 durometer, black
      test: ASTM D412-16
      requirement: min 10 MPa
    method: Test report value on the Global O-Ring HNBR90 compound report
    status: ground
    source: globaloring-hnbr90
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Tensile Strength, min, Mpa row, results column
  - benchmark: elongation
    label: Elongation at break (90 durometer grade)
    value: 229
    unit: '%'
    scope: material
    conditions:
      grade: 90 durometer, black
      test: ASTM D412-16
      requirement: min 100 percent
    method: Test report value on the Global O-Ring HNBR90 compound report
    status: ground
    source: globaloring-hnbr90
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Elongation, min, percent row, results column
  - benchmark: density
    label: Specific gravity (90 durometer grade)
    value: 1.28
    unit: g/cm3
    scope: material
    conditions:
      grade: 90 durometer, black
      test: ASTM D297-15
      unit_in_source: g/cm³ (printed as Specific Gravity (g/cm³))
    method: Test report value on the Global O-Ring HNBR90 compound report
    status: ground
    source: globaloring-hnbr90
    where: Test report, ORIGINAL PHYSICAL PROPERTIES, Specific Gravity row
  - benchmark: compression_set
    label: Compression set after 22 h at 150 °C (90 durometer grade)
    value: 17
    unit: '%'
    scope: material
    conditions:
      grade: 90 durometer, black
      test: ASTM D395-18
      method_letter: B
      time: 22 h
      temperature: 150 °C
      requirement: max 35 percent
    method: Test report result, method B, as printed
    status: ground
    source: globaloring-hnbr90
    where: Test report, row B36, COMPRESSION SET, METHOD B, 22 hours at 150°C (302°F), max, percent
  - benchmark: tr10_retraction_temperature
    label: TR-10 retraction temperature (90 durometer grade)
    value: -21.9
    unit: °C
    scope: material
    conditions:
      grade: 90 durometer, black
      test: ASTM D1329-16
      die: 51 mm
      elongation: 50 percent
    method: Test report value, printed as -21.9 under TR-10, Retraction at Lower Temperature Resistance, 51 mm die, 50% elongation, °C
    status: ground
    source: globaloring-hnbr90
    where: Test report, row Z, TR-10 section, results column
  - benchmark: max_service_temp
    label: Heat resistance upper limit (Parker)
    value: 150
    unit: °C
    scope: material
    conditions:
      basis: Parker states Up to 150°C (300°F) under Heat resistance for hydrogenated nitrile
    method: Statement in the Parker O-ring handbook
    status: ground
    source: parker-handbook
    where: Section 2.2.9 Hydrogenated Nitrile, Heat resistance
  - benchmark: max_service_temp
    label: Approximate service range upper limit (Parker table)
    value: 149
    unit: °C
    scope: material
    conditions:
      basis: Approximate Service Temperature Ranges for Commonly Used Basic Polymer Types, Hydrogenated Nitrile row, printed as -32°C to 149°C (-23°F to 300°F) with an asterisk footnote not read
    method: Table value printed in degC first in the Parker handbook
    status: ground
    source: parker-handbook
    where: Approximate Service Temperature Ranges table, Hydrogenated Nitrile row
  - benchmark: min_service_temp
    label: Approximate service range lower limit (Parker table)
    value: -32
    unit: °C
    scope: material
    conditions:
      basis: Approximate Service Temperature Ranges for Commonly Used Basic Polymer Types, Hydrogenated Nitrile row, printed as -32°C to 149°C (-23°F to 300°F) with an asterisk footnote not read
    method: Table value printed in degC first in the Parker handbook
    status: ground
    source: parker-handbook
    where: Approximate Service Temperature Ranges table, Hydrogenated Nitrile row
  - benchmark: cold_flexibility_limit
    label: Cold flexibility limit (Parker)
    value: -48
    unit: °C
    scope: material
    conditions:
      basis: Parker states Down to approximately -48°C (-55°F) under Cold flexibility for hydrogenated nitrile
    method: Statement in the Parker O-ring handbook; this is a stated cold limit, not a test result
    status: ground
    source: parker-handbook
    where: Section 2.2.9 Hydrogenated Nitrile, Cold flexibility
corrosion:
  - environment: Heat ageing, 70 h at 150 °C in air (70 durometer grade)
    headline: Heat ageing for 70 h at 150 °C changes hardness by +3 points and elongation by -10 percent, with tensile strength unchanged.
    effect: After 70 h at 150 °C (ASTM D865-11), the 70 durometer grade changed by +3 hardness points, 0 percent tensile strength, -10 percent elongation and 0.3 percent weight. The requirements were +10 points, -15 percent and -25 percent.
    rating: low
    conditions:
      time: 70 h
      temperature: 150 °C
      standard: ASTM D865-11
      grade: 70 durometer
    source: globaloring-hnbr70
    where: Test report, A26 HEAT AGE rows
  - environment: Heat ageing, 70 h at 150 °C (90 durometer grade)
    headline: Heat ageing for 70 h at 150 °C changes hardness by +6 points and elongation by -20.0 percent; tensile strength rose 17 percent.
    effect: After 70 h at 150 °C (ASTM D573-10), the 90 durometer grade changed by +6 hardness points, +17 percent tensile strength and -20.0 percent elongation. The requirements were +10 points, -15 percent and -25 percent.
    rating: low
    conditions:
      time: 70 h
      temperature: 150 °C
      standard: ASTM D573-10
      grade: 90 durometer
    source: globaloring-hnbr90
    where: Test report, A26 HEAT RESISTANCE rows
  - environment: IRM 901 oil, 70 h at 150 °C (70 durometer grade)
    headline: In IRM 901 oil at 150 °C the 70 durometer grade swelled 2.8 percent in volume, with a small change in strength.
    effect: After 70 h at 150 °C in IRM 901 oil (ASTM D471-16), the 70 durometer grade changed by +1 hardness point, +4 percent tensile strength, 0 percent elongation and -2.8 percent volume. The requirements were -5 to +10 points, -20 percent maximum tensile change, -30 percent maximum elongation change and -10 to +5 percent volume.
    rating: low
    conditions:
      time: 70 h
      temperature: 150 °C
      standard: ASTM D471-16
      oil: IRM 901
      grade: 70 durometer
    source: globaloring-hnbr70
    where: Test report, EO16 IRM901 OIL RESISTANCE rows
  - environment: IRM 903 oil, 70 h at 150 °C (70 durometer grade)
    headline: In IRM 903 oil at 150 °C the 70 durometer grade swelled 10.2 percent in volume.
    effect: After 70 h at 150 °C in IRM 903 oil (ASTM D471-16), the 70 durometer grade changed by -5 hardness points, -2 percent tensile strength, -4 percent elongation and +10.2 percent volume. The requirement for volume was +25 percent maximum.
    rating: moderate
    conditions:
      time: 70 h
      temperature: 150 °C
      standard: ASTM D471-16
      oil: IRM 903
      grade: 70 durometer
    source: globaloring-hnbr70
    where: Test report, EO36 IRM903 OIL RESISTANCE rows
  - environment: IRM 901 oil, 70 h at 150 °C (90 durometer grade)
    headline: In IRM 901 oil at 150 °C the 90 durometer grade swelled 3 percent in volume, with tensile strength up 11 percent.
    effect: After 70 h at 150 °C in IRM 901 oil (ASTM D471-16), the 90 durometer grade changed by +4 hardness points, +11 percent tensile strength, +2 percent elongation and -3 percent volume. The requirements were -5 to +10 points, -20 percent maximum tensile change, -30 percent maximum elongation change and -10 to +5 percent volume.
    rating: low
    conditions:
      time: 70 h
      temperature: 150 °C
      standard: ASTM D471-16
      oil: IRM 901
      grade: 90 durometer
    source: globaloring-hnbr90
    where: Test report, EO16 IRM901 OIL RESISTANCE rows
  - environment: IRM 903 oil, 70 h at 150 °C (90 durometer grade)
    headline: In IRM 903 oil at 150 °C the 90 durometer grade swelled 13 percent in volume and lost 17 percent elongation.
    effect: After 70 h at 150 °C in IRM 903 oil (ASTM D471-16), the 90 durometer grade changed by -3 hardness points, -4 percent tensile strength, -17 percent elongation and +13 percent volume. The requirement for volume was +25 percent maximum.
    rating: moderate
    conditions:
      time: 70 h
      temperature: 150 °C
      standard: ASTM D471-16
      oil: IRM 903
      grade: 90 durometer
    source: globaloring-hnbr90
    where: Test report, EO36 IRM903 OIL RESISTANCE rows
  - environment: Water and steam
    headline: HNBR resists water and steam up to about 150 °C, but the two sources give slightly different limits.
    effect: Parker lists water and steam up to 149°C (300°F) as compatible. The Global O-Ring data sheets say water and steam to 150 ºC (300 ºF). Both are qualitative statements without test conditions.
    rating: none
    conditions:
      basis: qualitative statements, no test duration given
    source: parker-handbook
    where: Section 2.2.9 Hydrogenated Nitrile, chemical resistance list
  - environment: Chlorinated hydrocarbons, ketones, ethers, esters and strong acids
    headline: The data sheets list these media as poor for HNBR.
    effect: The HNBR70 and HNBR90 data sheets both list chlorinated hydrocarbons, ketones, ethers, esters and strong acids under Doesn't Perform Well In. Parker lists chlorinated hydrocarbons, polar solvents (ketones, esters and ethers) and strong acids as not compatible.
    rating: severe
    conditions:
      basis: qualitative lists, no test values given
    source: globaloring-hnbr70
    where: Doesn't Perform Well In box (same list on the HNBR90 data sheet); Parker section 2.2.9 Not compatible with list
  - environment: Ozone, ageing and weathering
    headline: Parker rates HNBR as resistant to ozone, ageing and weathering, with no test values.
    effect: Parker lists ozone, ageing and weathering under HNBR chemical resistance. The sources read give no numbers for this.
    rating: none
    conditions:
      basis: qualitative statement, no test conditions given
    source: parker-handbook
    where: Section 2.2.9 Hydrogenated Nitrile, chemical resistance list
risks:
  hazards:
    - text: No hazard classification found in this run. The HNBR data sheets have no hazard section, and no safety data sheet for an HNBR compound was retrieved.
      ghs: []
      source: globaloring-hnbr70
      where: Data sheet, no hazard section
  failure_risks:
    - mode: Stiffening and loss of flexibility at low temperature
      trigger: 'Service below the cold limits: TR-10 retraction of -21.9 °C for the 90 durometer grade and Parker''s cold flexibility limit of about -48 °C'
      consequence: The seal loses flexibility below these limits. The sources read give no leak threshold.
      severity: moderate
      source: globaloring-hnbr90
      where: Test report, TR-10 row; Parker section 2.2.9 Cold flexibility
    - mode: Permanent set after long compression in heat
      trigger: Compressed at 150 °C for 22 h
      consequence: 'The seal recovers less of its shape: 13.1 percent set for the 70 durometer grade and 17 percent for the 90 durometer grade'
      severity: moderate
      source: globaloring-hnbr70
      where: Test report, B16 COMPRESSION SET row
    - mode: Swelling in IRM 903 oil
      trigger: Service in IRM 903 oil at 150 °C for 70 h
      consequence: The compound swells 10.2 percent (70 durometer) and 13 percent (90 durometer) in volume, with elongation loss up to 17 percent
      severity: moderate
      source: globaloring-hnbr90
      where: Test report, EO36 IRM903 OIL RESISTANCE rows
    - mode: Attack by chlorinated hydrocarbons, ketones, ethers, esters and strong acids
      trigger: Service in these media
      consequence: The data sheets list these media as poor for HNBR. No test values are given in the sources read.
      severity: critical
      source: globaloring-hnbr70
      where: Doesn't Perform Well In box
  side_effects:
    - text: No side effects found in this run.
      affects: Not sourced
      source: parker-handbook
      where: not found
  handling:
    - text: Read the supplier safety data sheet for the specific HNBR compound before handling. None was retrieved in this run.
      source: globaloring-hnbr70
    - text: Keep service within the datasheet range of -40 °C to 150 °C, as printed on both data sheets.
      source: globaloring-hnbr90
  mitigations:
    - text: The sources read give no mitigation for oil or chemical exposure. Check the grade against the medium before use, as the data sheets list poor media.
      source: globaloring-hnbr70
uses:
  - application: propulsion-and-tanks
    device: O-ring and seal in petroleum-based oil and fuel service
    example: The HNBR70 data sheet says HNBR performs well in petroleum based oils and fuels and in aliphatic hydrocarbons. No space mission is named in the sources read.
    source: globaloring-hnbr70
    where: Performs Well In box
  - application: mechanisms
    device: Hydraulic and mineral-oil seals in dynamic service
    example: Parker says hydrogenated nitrile has superior mechanical characteristics, particularly high strength, which helps reduce extrusion and wear, and lists HFA, HFB and HFC hydraulic fluids as compatible. No space mission is named in the sources read.
    source: parker-handbook
    where: Section 2.2.9 Hydrogenated Nitrile, opening paragraph and chemical resistance list
supply: []
media: []
documents:
  - title: Global O-Ring and Seal, O-Ring Compound HNBR70 Data Sheet and test report
    type: datasheet
    url: https://www.globaloring.com/wp-content/uploads/2019/09/HNBR70.pdf
  - title: Global O-Ring and Seal, O-Ring Compound HNBR90 Data Sheet and test report
    type: datasheet
    url: https://www.globaloring.com/wp-content/uploads/2019/09/HNBR90.pdf
  - title: Parker O-Ring Handbook (copy hosted by the University of Arizona)
    type: report
    url: https://nfc.arizona.edu/sites/default/files/2022-02/parker_o-ring_handbook.pdf
gaps:
  - Only three sources were read in this run. The brief asks for at least five. The web search budget for this turn was used up before the manufacturer datasheets from Zeon or Lanxess could be found, and the Wikipedia title tried returned no article.
  - 'Designations: no UNS, EN, ASTM, ISO or trade designation for HNBR was printed in any source read. The ASTM D2000 line call-outs M4DH716 (70 durometer) and M4DH910 (90 durometer) on the test reports classify these compounds; they are not designations of HNBR as a material and are not listed under identity.designations.'
  - 'Monomer composition and acrylonitrile share: not stated in any source read. The data sheets name only the butadiene segments; the nitrile monomer ratio is not given.'
  - 'Supply: no producer, country share, feedstock or critical-mineral status for HNBR was found. No USGS, BGS or trade source was read in this run.'
  - 'Hazards and GHS: the PubChem pages for acrylonitrile and 1,3-butadiene returned a reCAPTCHA page in this run, so no GHS data were read. No HNBR safety data sheet was retrieved.'
  - 'Outgassing to ASTM E595 (TML and CVCM) for HNBR: not found. NASA RP-1124 Revision 4 (NTRS 19970027853) was read in this run and has no hydrogenated nitrile or nitrile entry.'
  - 'Atomic oxygen, radiation resistance and spaceflight data for HNBR: not found in any source read. No spacecraft flight use was named.'
  - The HNBR70 test report marks brittleness temperature as pass with no cracks at T-50 in isopropyl alcohol (ASTM D2137-11A), but prints no numeric temperature. No value was recorded.
  - 'Property names not in spores/property-canon.yaml: hardness, compression_set, modulus_at_100_percent, tr10_retraction_temperature and cold_flexibility_limit. The canonical names were used where they exist (ultimate_tensile_strength, elongation, density, max_service_temp, min_service_temp).'
  - Heat-age and oil-swell results are recorded in corrosion, not as properties, because the sources give them as changes against a requirement.
  - The Parker table footnote marked with an asterisk, which applies to the HNBR service range, was not read.
story:
  recipe:
    line: HNBR is nitrile rubber (NBR) with its butadiene double bonds saturated by hydrogen (Global O-Ring data sheets; Parker section 2.2.9). The compounds are peroxide-cured (both data sheets). The sources read give no monomer ratio, hydrogenation degree or catalyst.
    parts:
      - name: Acrylonitrile
        share_note: No share given in any source read; the nitrile unit is named by the polymer family
        role: Polar nitrile comonomer in the NBR base polymer
      - name: Butadiene
        share_note: No share given in any source read
        role: Butadiene segments whose double bonds are saturated by hydrogen in the HNBR process
  risk_groups:
    - title: For people
      lead: No hazard classification was retrieved for HNBR in this run. Read the supplier safety data sheet for the compound before handling.
      points:
        - label: Safety data
          line: The data sheets carry no hazard section, and no safety data sheet for an HNBR compound was retrieved.
    - title: For the monomers
      verdict: Hazard data not retrieved in this run
      lead: PubChem returned a reCAPTCHA page for acrylonitrile and 1,3-butadiene in this run, so no GHS classification was read for either monomer.
      points:
        - label: Monomers
          line: Acrylonitrile and butadiene are the monomer feedstocks named in the polymer family; their hazards have not been checked in this profile.
  why: HNBR (hydrogenated nitrile rubber, also called HSN) is a heat-resistant seal elastomer. The Global O-Ring HNBR70 and HNBR90 test reports and the Parker handbook say it resists heat, oils, fuels and ozone better than standard nitrile, with a service range of -40 °C to 150 °C on the data sheets. Its weak points are chlorinated hydrocarbons, ketones, ethers, esters and strong acids.
  uses:
    - where: O-rings and seals in petroleum oil and fuel service
      line: The HNBR70 data sheet lists petroleum based oils and fuels and aliphatic hydrocarbons under Performs Well In. No space mission is named in the sources read.
    - where: Hydraulic and mineral-oil seals
      line: Parker says hydrogenated nitrile has high strength that reduces extrusion and wear, and lists HFA, HFB and HFC hydraulic fluids as compatible.
  can_do:
    - label: Temperature
      value: '-40 °C to 150 °C'
      line: Both Global O-Ring data sheets print a temperature range of -40 °C (-40 °F) to 150 °C (302 °F). Parker's approximate service table gives -32 °C to 149 °C for hydrogenated nitrile.
    - label: Hardness and strength
      value: 72 Shore A, 23.4 MPa
      line: The 70 durometer grade has a hardness of 72 Shore A, a tensile strength of 23.4 MPa and an elongation of 282 percent. The 90 durometer grade has 87 Shore A, 21.6 MPa and 229 percent.
    - label: Compression set
      value: 13.1 percent (70 grade), 17 percent (90 grade)
      line: After 22 hours at 150 °C (ASTM D395), the 70 durometer grade keeps 13.1 percent set and the 90 durometer grade 17 percent. Both are well under the printed maxima of 30 and 35 percent.
    - label: Cold limit
      value: '-21.9 °C TR-10'
      line: The 90 durometer grade gives a TR-10 retraction temperature of -21.9 °C (ASTM D1329-16). Parker gives a cold flexibility limit of about -48 °C.
  compare: The Global O-Ring data sheets say HNBR has superior heat, ozone, chemical resistance and mechanical characteristics over standard nitrile (NBR). Parker's approximate service table gives HNBR -32 °C to 149 °C, and its general text gives up to 150 °C for heat. The two sources differ by one degree at the top end, and both are shown in the record. No NBR or fluoroelastomer values were read into this profile; for a fluoroelastomer comparison see the FKM profile.
  compare_rows:
    - scope: material
      label: Upper service limit
      benchmark: max_service_temp
    - scope: material
      label: Lower service limit
      benchmark: min_service_temp
    - scope: material
      label: Compression set after 22 h at 150 °C
      benchmark: compression_set
  handling:
    - Read the product safety data sheet before use. None was retrieved here.
    - Keep service within -40 °C to 150 °C, the range printed on both data sheets.
    - Check the medium before use. The data sheets list chlorinated hydrocarbons, ketones, ethers, esters and strong acids as poor.
  good_for:
    - 'Oil and fuel seals at high temperature: the data sheets give a range of -40 °C to 150 °C and list petroleum oils, fuels and aliphatic hydrocarbons as performing well.'
    - 'Hydraulic seals: Parker lists HFA, HFB and HFC hydraulic fluids as compatible and says the high strength reduces extrusion and wear.'
  watch_out:
    - 'Ketones, esters, ethers, chlorinated hydrocarbons and strong acids: the data sheets and Parker list them as poor or not compatible.'
    - 'Heat ageing: 70 h at 150 °C changes hardness by +3 to +6 points and elongation by -10 to -20 percent across the two grades.'
    - 'Cold: TR-10 retraction is -21.9 °C for the 90 durometer grade, and Parker''s cold flexibility limit is about -48 °C.'
    - 'Space use: no outgassing (ASTM E595), radiation or atomic oxygen data was found, so this profile does not clear HNBR for vacuum or spaceflight use.'
  verdict: 'HNBR is a well-documented seal elastomer for oil, fuel and heat service up to 150 °C, with supplier test data for two durometer grades. The Parker handbook and the two data sheets agree on its range, and differ by one degree at the top end. Missing from this profile: composition ratios, supply, GHS hazards, outgassing and any flight data.'
sources:
  globaloring-hnbr70:
    title: Global O-Ring and Seal, O-Ring Compound HNBR70 Data Sheet and test report (70 durometer, black)
    id: Global O-Ring HNBR70 data sheet, uploaded 2019/09
    url: https://www.globaloring.com/wp-content/uploads/2019/09/HNBR70.pdf
    kind: datasheet
    license: Supplier data sheet, cited
  globaloring-hnbr90:
    title: Global O-Ring and Seal, O-Ring Compound HNBR90 Data Sheet and test report (90 durometer, black)
    id: Global O-Ring HNBR90 data sheet, uploaded 2019/09
    url: https://www.globaloring.com/wp-content/uploads/2019/09/HNBR90.pdf
    kind: datasheet
    license: Supplier data sheet, cited
  parker-handbook:
    title: Parker O-Ring Handbook (copy hosted by the University of Arizona)
    id: Parker O-Ring Handbook, copy at the University of Arizona
    url: https://nfc.arizona.edu/sites/default/files/2022-02/parker_o-ring_handbook.pdf
    kind: handbook
    license: Manufacturer handbook, cited
license: CC-BY-4.0
updated: '2026-11-01'
review:
  status: draft
  method: assistant
  checked_values: 18
  note: Written on 2026-11-01 from the two Global O-Ring HNBR data sheets (test reports, read by pdftotext and page images) and the Parker O-Ring Handbook, section 2.2.9 and the approximate service table, all read in this run. PubChem and the Wikipedia title tried were unavailable. Three sources, below the five the brief asks for.