Fluorosilicone rubber (FVMQ) FVMQ

spore: profile
id: fluorosilicone-fvmq
spore_version: 0.2
family: fluorosilicone
name: Fluorosilicone rubber (FVMQ)
abbreviation: FVMQ
role: fuel- and oil-resistant elastomer for O-rings, gaskets and connector seals
category: seals-adhesives
type: elastomers-and-o-rings
summary: Fluorosilicone rubber (FVMQ) is a silicone elastomer with fluorinated side groups, sold as seal compounds. The Angst+Pfister compound FVMQ 70.16-01 is blue, 70 Shore A, and has a minimum operating temperature of -60 °C (static) and a long-term maximum of 200 °C. NASA's outgassing table lists a blue FVMQ O-ring of 70 Shore A with 0.59 % total mass loss and 0.02 % collected volatile condensable material in vacuum.
best_for: 'Low-temperature seals and O-rings: a 70 Shore A blue compound rated to -60 °C (static minimum on the datasheet)'
weakest_at: 'Long-term heat: compression set reaches 25 % after 22 h at 175 °C, and the datasheet gives no value above its 200 °C long-term maximum'
identity:
  formula: Fluorosilicone elastomer (FVMQ); repeat unit and monomer ratio not stated in the sources read
  source: angst-fvmq-70
  where: Material name and material description rows, compound FVMQ 70.16-01
tags:
  environments: []
  stresses:
    - extreme-cold
    - extreme-heat
    - vacuum-and-outgassing
  applications:
    - electronics-and-chips
    - mechanisms
properties:
  - benchmark: density
    label: Density, FVMQ 70.16-01 compound
    value: 1.55
    unit: g/cm3
    scope: material
    conditions:
      compound: FVMQ 70.16-01, blue, 70 Shore A
      tolerance: plus or minus 0.02 as printed
      temperature: not printed
    method: ISO 2781-A as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Mechanical properties table, Density row
  - benchmark: hardness_shore_a
    label: Hardness, FVMQ 70.16-01 compound
    value: 70
    unit: Shore A
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      tolerance: plus or minus 5 as printed
    method: ASTM D 2240 as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Mechanical properties table, Hardness row
  - benchmark: ultimate_tensile_strength
    label: Tensile strength, FVMQ 70.16-01 compound
    value: 6.55
    unit: MPa
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      specimen: not printed
      temperature: not printed
    method: ASTM D 412-C as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Mechanical properties table, Tensile strength row
  - benchmark: elongation
    label: Elongation at break, FVMQ 70.16-01 compound
    value: 150
    unit: '%'
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      specimen: not printed
    method: ASTM D 412-C as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Mechanical properties table, Elongation at break row
  - benchmark: compression_set
    label: Compression set, 70 h at 150 °C
    value: 30
    unit: '%'
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      time: 70 h
      temperature: 150 °C
      note_as_printed: AMS 3021 printed beside this entry
    method: ASTM D 395-B as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Mechanical properties table, Compression set row, first entry
  - benchmark: compression_set
    label: Compression set, 70 h at 23 °C and 25 % strain
    value: 15
    unit: '%'
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      time: 70 h
      temperature: 23 °C
      strain: 25 %
    method: ASTM D 395-B2 as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Mechanical properties table, Compression set row, second entry
  - benchmark: compression_set
    label: Compression set, 22 h at 175 °C
    value: 25
    unit: '%'
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      time: 22 h
      temperature: 175 °C
    method: ASTM D 395-B as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Mechanical properties table, Compression set row, third entry
  - benchmark: min_service_temp
    label: Minimum operating temperature (static), FVMQ 70.16-01
    value: -60
    unit: °C
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      basis: printed as stat. (static), not a sealing test
    method: Manufacturer's stated minimum operating temperature, a rating and not a test standard
    status: ground
    source: angst-fvmq-70
    where: Thermal properties table, Min. operating temperature stat. row
  - benchmark: max_service_temp
    label: Maximum operating temperature (long term), FVMQ 70.16-01
    value: 200
    unit: °C
    scope: material
    conditions:
      compound: FVMQ 70.16-01
      basis: printed as long term
    method: Manufacturer's stated maximum operating temperature, a rating and not a test standard
    status: ground
    source: angst-fvmq-70
    where: Thermal properties table, Max. operating temperature long term row
  - benchmark: min_service_temp
    label: Standard low temperature, fluorosilicone O-rings (reseller)
    value: -60
    unit: °C
    scope: material
    conditions:
      product: standard fluorosilicone O-rings, generic
      basis: printed as Standard Low Temp, duration not stated
    method: Reseller's stated rating, not a test standard
    status: ground
    source: globaloring-fvmq
    where: Fluorosilicone O-Ring Temperature Range section, Standard Low Temp line
  - benchmark: max_service_temp
    label: Standard high temperature, fluorosilicone O-rings (reseller)
    value: 177
    unit: °C
    scope: material
    conditions:
      product: standard fluorosilicone O-rings, generic
      basis: printed as Standard High Temp, duration not stated
    method: Reseller's stated rating, not a test standard
    note: A generic reseller rating. It differs from the 200 °C long-term maximum for compound FVMQ 70.16-01 on the manufacturer datasheet, so both values are kept.
    status: ground
    source: globaloring-fvmq
    where: Fluorosilicone O-Ring Temperature Range section, Standard High Temp line
  - benchmark: tr10_temperature
    label: TR10 low-temperature retraction, FVMQ 70.16-01
    value: -56.6
    unit: °C
    scope: material
    conditions:
      compound: FVMQ 70.16-01
    method: ASTM D 1329 as printed on the manufacturer datasheet
    status: ground
    source: angst-fvmq-70
    where: Thermal properties table, TR 10 value row
  - benchmark: total_mass_loss
    label: Total mass loss, blue FVMQ 70 Shore A O-ring
    value: 0.59
    unit: '%'
    scope: material
    conditions:
      row: O RING BLUE FLUOROSILICONE 70 SH L677-70-2-017, manufacturer code CSC
      cure_time_temperature: not printed in the row
      test: ASTM E 595 per the RP-1124 text
    method: NASA GSFC micro-CVCM outgassing test as described in NASA RP-1124
    status: ground
    source: nasa-rp1124
    where: Materials table, row GSC16506, %TML column
  - benchmark: cvcm
    label: Collected volatile condensable materials, blue FVMQ 70 Shore A O-ring
    value: 0.02
    unit: '%'
    scope: material
    conditions:
      row: same row as the total mass loss entry
      test: ASTM E 595 per the RP-1124 text
    method: NASA GSFC micro-CVCM outgassing test as described in NASA RP-1124
    status: ground
    source: nasa-rp1124
    where: Materials table, row GSC16506, %CVCM column
  - benchmark: water_vapor_regained
    label: Water vapor regained, blue FVMQ 70 Shore A O-ring
    value: 0.03
    unit: '%'
    scope: material
    conditions:
      row: same row as the total mass loss entry
    method: NASA GSFC water vapor regained measurement as described in NASA RP-1124
    status: ground
    source: nasa-rp1124
    where: Materials table, row GSC16506, %WVR column
  - benchmark: total_mass_loss
    label: Total mass loss, blue FVMQ HR O-ring
    value: 0.25
    unit: '%'
    scope: material
    conditions:
      row: O RING BLUE FLUOROSILICONE HR L677-70-2-028, manufacturer code SPN
      cure_time_temperature: not printed in the row
      test: ASTM E 595 per the RP-1124 text
    method: NASA GSFC micro-CVCM outgassing test as described in NASA RP-1124
    status: ground
    source: nasa-rp1124
    where: Materials table, row GSC16504, %TML column
corrosion:
  - environment: Hot air at 175 °C for 22 hours (compression set test)
    headline: After 22 hours at 175 °C the compression set reached 25 % on the manufacturer datasheet.
    effect: The seal keeps less of its thickness after hot compression. The datasheet gives no tensile or hardness figure after heat ageing, so retained properties after long exposure are not known from the sources read.
    rating: unknown
    conditions:
      test: ASTM D 395-B, 22 h at 175 °C, as printed
      compound: FVMQ 70.16-01
    source: angst-fvmq-70
    where: Mechanical properties table, Compression set row, third entry
  - environment: Fuel and mineral oil
    headline: A reseller says fluorosilicone resists fuel and mineral oil better than standard silicone, with no number given.
    effect: The reseller describes FVMQ as having improved fuel and mineral oil resistance compared with standard VMQ, and lists fuels and aromatic mineral oils under Performs Well In. It gives no swell, retention or immersion test figure.
    rating: unknown
    conditions:
      basis: qualitative claim on a reseller page
    source: globaloring-fvmq
    where: Fluorosilicone O-Ring Material Description section and Performs Well In list
  - environment: Ozone and weather
    headline: The reseller lists ozone and weather resistance with no rating.
    effect: Ozone and weather appear under Performs Well In on the reseller page. No test method or rating number is given.
    rating: unknown
    conditions:
      basis: qualitative list on a reseller page
    source: globaloring-fvmq
    where: Performs Well In list
  - environment: Ozone and weather, general FVMQ rubber
    headline: The Robinson Rubber FVMQ guide rates ozone resistance and weather resistance as Excellent.
    effect: Robinson Rubber's general guide to fluorosilicone rubber (FVMQ) prints Ozone Resistance Excellent and Weather Resistance Excellent. The guide covers the family, not compound FVMQ 70.16-01, and gives no test method or time to failure.
    rating: none
    conditions:
      basis: family-level rating in a supplier selection guide, not a test on compound FVMQ 70.16-01
      printed_rating: Excellent
      rating_scale: Space Mushroom maps printed Excellent to none, Good to Excellent to low, Poor to severe
    source: robinson-fvmq-guide
    where: Environmental Performance list, page 3, rows Ozone Resistance and Weather Resistance
  - environment: Aliphatic hydrocarbon fuel, general FVMQ rubber
    headline: The Robinson Rubber FVMQ guide rates aliphatic hydrocarbon fuel resistance as Excellent.
    effect: Robinson Rubber's general guide to FVMQ prints Fuel, Aliphatic Hydrocarbon as Excellent, and LP Gases and Fuel Oils as Excellent. The rating is for the family, not compound FVMQ 70.16-01, and no swell or retention figure is given.
    rating: none
    conditions:
      basis: family-level rating in a supplier selection guide, not a test on compound FVMQ 70.16-01
      printed_rating: Excellent
      rating_scale: Space Mushroom maps printed Excellent to none, Good to Excellent to low, Poor to severe
    source: robinson-fvmq-guide
    where: Chemical Resistance list, page 2, rows Fuel, Aliphatic Hydrocarbon and LP Gases & Fuel Oils
  - environment: Aromatic hydrocarbon fuel, general FVMQ rubber
    headline: The Robinson Rubber FVMQ guide rates aromatic hydrocarbon fuel resistance as Good to Excellent.
    effect: Robinson Rubber's general guide to FVMQ prints Fuel, Aromatic Hydrocarbon as Good to Excellent. The rating is for the family, not compound FVMQ 70.16-01, and no swell or retention figure is given. The guide's other oil rows read Mineral Oils Good to Excellent.
    rating: low
    conditions:
      basis: family-level rating in a supplier selection guide, not a test on compound FVMQ 70.16-01
      printed_rating: Good to Excellent
      rating_scale: Space Mushroom maps printed Excellent to none, Good to Excellent to low, Poor to severe
    source: robinson-fvmq-guide
    where: Chemical Resistance list, page 2, row Fuel, Aromatic Hydrocarbon
  - environment: Ketones, general FVMQ rubber
    headline: The Robinson Rubber FVMQ guide rates ketone resistance as Poor.
    effect: Robinson Rubber's general guide to FVMQ prints Ketones as Poor. The guide also prints Poor for Aldehydes, Amines, Brake Fluids Non-Petroleum Based and Lacquer Solvents. The rating is for the family, not compound FVMQ 70.16-01.
    rating: severe
    conditions:
      basis: family-level rating in a supplier selection guide, not a test on compound FVMQ 70.16-01
      printed_rating: Poor
      rating_scale: Space Mushroom maps printed Excellent to none, Good to Excellent to low, Poor to severe
    source: robinson-fvmq-guide
    where: Chemical Resistance list, page 2, row Ketones
risks:
  hazards:
    - text: Supplier listing for poly(methyl-3,3,3-trifluoropropylsiloxane), CAS 63148-56-1, a related uncured fluorosilicone fluid and not the cured FVMQ 70.16-01 elastomer, prints GHS codes H315, H319 and H335 with signal word Warning. The listing gives the codes only, not their full wording.
      ghs:
        - H315
        - H319
        - H335
      source: abcr-fluorosilicone-fluid
      where: Product page for AB211196 (CAS 63148-56-1), Hazard statements and Signal word fields
  failure_risks:
    - mode: Long-term heat above the rated limit
      trigger: Service above 200 °C for long periods, or long hot compression
      consequence: The datasheet gives no value above its 200 °C long-term maximum, and compression set reaches 25 % after 22 h at 175 °C, so less sealing force is retained.
      severity: moderate
      source: angst-fvmq-70
      where: Thermal properties table, and Mechanical properties table, Compression set row
  side_effects:
    - text: In vacuum the blue FVMQ 70 Shore A O-ring listed by NASA lost 0.59 % total mass and gave off 0.02 % collected volatile condensable material. NASA's listing limits are 1.0 % TML and 0.10 % CVCM.
      affects: Nearby optics and sensitive surfaces that collect condensed volatiles
      source: nasa-rp1124
      where: Materials table, row GSC16506; Introduction, listing criteria
  handling:
    - text: Keep long-term service at or below 200 °C for compound FVMQ 70.16-01.
      source: angst-fvmq-70
      where: Thermal properties table, Max. operating temperature long term row
  mitigations:
    - text: Check the current drawing or specification before use. The datasheet says its values are not guaranteed and must not be used for specification purposes.
      source: angst-fvmq-70
      where: Disclaimer at the foot of the datasheet
uses:
  - application: electronics-and-chips
    device: Connector O-ring seal
    example: NASA RP-1124 lists blue fluorosilicone O-rings for connectors, for example a 70 Shore A L677-70-2-017 O-ring with application CONN O RING.
    source: nasa-rp1124
    where: Materials table, row GSC16506, APPLICATION column
  - application: electronics-and-chips
    device: Connector gasket
    example: NASA RP-1124 lists a blue fluorosilicone connector gasket to MIL R25988B.
    source: nasa-rp1124
    where: Materials table, row GSC19123, CONN GASKET entry
  - application: mechanisms
    device: Molded shapes, compression seals and die-cut gaskets
    example: Elastapro says MIL-DTL-25988 Type I covers O-rings, molded shapes and compression seals, and Type II covers sheet, molded strip and die-cut gaskets.
    source: elastapro-mil25988
    where: MIL-DTL-25988 material matrix, Types I and II
supply:
  - subject: Fluorine, as fluorspar (the feedstock for hydrogen fluoride)
    producers:
      - country: China
        share_percent: 60
        year: 2025
      - country: Mexico
        share_percent: 15
        year: 2025
      - country: Mongolia
        share_percent: 15
        year: 2025
    critical_lists:
      - list: USGS 2025 List of Critical Minerals (fluorspar)
        listed: true
    recycling: Not stated in the fluorspar chapter read in this run.
    substitutes: []
    source: usgs-mcs2026-fluorspar
    where: 'World Mine Production and Reserves table, 2025e column (world total 10,000 thousand t; shares calculated by Space Mushroom from China 6,000, Mexico 1,500 and Mongolia 1,500). Domestic production and use text says HF is the primary feedstock for fluoropolymers. Critical list: USGS 2025 list page (usgs-crit2025).'
  - subject: Silicon metal, used for the manufacture of silicones
    producers:
      - country: China
        share_percent: 87
        year: 2025
      - country: Brazil
        share_percent: 3.9
        year: 2025
      - country: Norway
        share_percent: 2.8
        year: 2025
    critical_lists:
      - list: USGS 2025 List of Critical Minerals (silicon)
        listed: true
    recycling: Insignificant, per the USGS silicon chapter.
    substitutes: []
    source: usgs-mcs2026-silicon
    where: 'World Mine Production table, silicon metal 2025 column (world total 4,600 thousand t as printed; shares calculated by Space Mushroom against that total). The silicones use is stated in the Domestic Production and Use text. Critical list: USGS 2025 list page (usgs-crit2025).'
documents:
  - title: Angst+Pfister Technical Data Sheet FVMQ 70.16-01
    type: datasheet
    url: https://www.Angst-Pfister.Com/dam/jcr:18b50b92-97d4-46ff-80d9-2a97d280d866/FVMQ%2070.16-01.pdf
    year: 2018
  - title: NASA RP-1124 Rev. 3, Outgassing Data for Spacecraft Materials
    type: report
    url: https://ntrs.nasa.gov/api/citations/19940017416/downloads/19940017416.pdf
    year: 1993
  - title: 'USGS Mineral Commodity Summaries 2026: Fluorspar'
    type: report
    url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-fluorspar.pdf
    year: 2026
  - title: 'USGS Mineral Commodity Summaries 2026: Silicon'
    type: report
    url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-silicon.pdf
    year: 2026
  - title: Rubber Material Selection Guide, FVMQ or Fluorosilicone Rubber (Robinson Rubber Products)
    type: datasheet
    url: https://robinsonrubber.com/wp-content/uploads/2024/02/RRPC-Rubber-Selection-Guide-Flourosilicone-Rubber.pdf
    year: 2024
gaps:
  - 'No hazard entry for the FVMQ compound: no safety data sheet or GHS record for FVMQ itself was found in this run. risks.hazards holds only a supplier listing for the related uncured fluid poly(methyl-3,3,3-trifluoropropylsiloxane), CAS 63148-56-1, which prints codes H315, H319 and H335 without their full wording. Checked and rejected: PubChem CID 4285173 is CAS 44839-32-9, a silanone monomer unit, and its record has no GHS section; the Gelest SDS SIT8365.5 is for the cyclic monomer (3,3,3-trifluoropropyl)methylcyclotetrasiloxane, CAS 429-67-4, which it lists as not classified; the Marco Rubber page for compound SM-F70-018 has no SDS link; the Fisher Scientific CAS 63148-56-1 page timed out. A supplier SDS for a specific FVMQ compound is still needed.'
  - No repeat unit, monomer ratio or atom count for FVMQ was found in any source read, so story.recipe.parts is empty.
  - Only one manufacturer datasheet (Angst+Pfister, compound FVMQ 70.16-01) was read in full. The Parker product page returned HTTP 403 and was not read.
  - Current status of MIL-DTL-25988 is not settled. Elastapro states it is the current active DoD detail specification; a search snippet names AMS-R-25988 as the equivalent SAE standard. Check the current drawing before relying on the MIL number.
  - No retained tensile strength, hardness change or volume swell after heat ageing or fuel immersion was found. The datasheet gives compression set only.
  - No flight, radiation or atomic-oxygen result for FVMQ was found. The only space source is the NASA outgassing listing, which dates from 1993.
  - The outgassing values were read from the OCR text layer of the NASA PDF. The cure time and temperature are blank for these rows in the table.
  - The EU critical raw materials list was not checked for fluorspar or silicon; only the USGS 2025 list was read.
  - Benchmark names hardness_shore_a, compression_set, total_mass_loss, cvcm, water_vapor_regained and tr10_temperature are not in spores/property-canon.yaml and were used as snake_case names.
  - The reseller's 177 °C standard high temperature disagrees with the datasheet's 200 °C long-term maximum; both are kept and neither was tested in this run.
sources:
  angst-fvmq-70:
    title: Technical Data Sheet FVMQ 70.16-01, fluorosilicone elastomer (Angst+Pfister Sealing Technology)
    id: Compound FVMQ 70.16-01 (old code FVMQ 70.16-03); datasheet dated 17.12.2018
    url: https://www.Angst-Pfister.Com/dam/jcr:18b50b92-97d4-46ff-80d9-2a97d280d866/FVMQ%2070.16-01.pdf
    year: 2018
    kind: datasheet
    license: manufacturer datasheet, cited and not reproduced
  globaloring-fvmq:
    title: Fluorosilicone O-rings (Globaloring, reseller page)
    id: Undated web page, read 2026-11-01
    url: https://www.globaloring.com/fluorosilicone-o-rings/
    year: 2026
    kind: web
    license: reseller page, cited and not reproduced
  nasa-rp1124:
    title: 'NASA Reference Publication 1124 Rev. 3: Outgassing Data for Spacecraft Materials (Campbell and Scialdone)'
    id: NTRS 19940017416; NASA RP-1124 Rev. 3, September 1993
    url: https://ntrs.nasa.gov/api/citations/19940017416/downloads/19940017416.pdf
    year: 1993
    kind: report
    license: public domain (NASA)
  elastapro-mil25988:
    title: MIL-DTL-25988 Fluorosilicone Sheeting and Compounds (Elastapro)
    id: Undated supplier web page, read 2026-11-01
    url: https://elastapro.com/mil-dtl-25988-fluorosilicone/
    year: 2026
    kind: web
    license: supplier page, cited and not reproduced
  usgs-mcs2026-fluorspar:
    title: 'Mineral Commodity Summaries 2026: Fluorspar'
    id: USGS MCS 2026, February 2026
    url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-fluorspar.pdf
    year: 2026
    kind: report
    license: public domain (USGS)
  usgs-mcs2026-silicon:
    title: 'Mineral Commodity Summaries 2026: Silicon'
    id: USGS MCS 2026, February 2026
    url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-silicon.pdf
    year: 2026
    kind: report
    license: public domain (USGS)
  robinson-fvmq-guide:
    title: Rubber Material Selection Guide, FVMQ or Fluorosilicone Rubber (Robinson Rubber Products)
    id: Robinson Rubber Products, RRPC selection guide, copyright 2024
    url: https://robinsonrubber.com/wp-content/uploads/2024/02/RRPC-Rubber-Selection-Guide-Flourosilicone-Rubber.pdf
    year: 2024
    kind: datasheet
    license: supplier guide, cited and not reproduced
  abcr-fluorosilicone-fluid:
    title: Poly(methyl-3,3,3-trifluoropropylsiloxane), MW 2400, product AB211196 (abcr supplier page)
    id: CAS 63148-56-1, product AB211196, read 2026-11-02
    url: https://abcr.com/de_en/ab211196
    year: 2026
    kind: web
    license: supplier page, cited and not reproduced
  usgs-crit2025:
    title: About the 2025 List of Critical Minerals (USGS)
    id: USGS final 2025 List of Critical Minerals
    url: https://www.usgs.gov/programs/mineral-resources-program/science/about-2025-list-critical-minerals
    year: 2025
    kind: web
    license: public domain (USGS)
license: CC-BY-4.0
updated: '2026-11-01'
review:
  status: draft
  method: assistant
  checked_values: 16
  note: Written by an AI assistant on 2026-11-01 from one manufacturer datasheet, the NASA RP-1124 table, two reseller or supplier web pages and two USGS chapters, and the Robinson Rubber FVMQ selection guide, all read in this run. No safety data sheet was found for FVMQ, so risks.hazards holds only a supplier listing for the related fluid CAS 63148-56-1.
story:
  recipe:
    line: Fluorosilicone rubber (FVMQ) is a silicone elastomer with fluorinated side groups, cured with a metal peroxide in standard compounds (reseller page). The sources read give no repeat unit, monomer ratio or atom count, so no parts are listed.
    parts: []
  risk_groups:
    - title: For people
      level: 0
      verdict: No FVMQ SDS found; a related fluid lists H315, H319, H335
      lead: No safety data sheet for an FVMQ compound was opened. This section covers the hazard codes of a related uncured fluid, plus the outgassing and heat limits from the sources read.
      points:
        - label: Outgassing
          line: In vacuum, the blue 70 Shore A O-ring in NASA's table lost 0.59 % total mass and gave off 0.02 % collected volatile condensable material. NASA's listing limits are 1.0 % and 0.10 %.
        - label: Heat
          line: The datasheet's long-term maximum is 200 °C. After 22 h at 175 °C the compression set reached 25 %.
        - label: Hazard codes
          line: Supplier listing for poly(methyl-3,3,3-trifluoropropylsiloxane), CAS 63148-56-1, a related uncured fluid, prints codes H315, H319 and H335 with signal word Warning. The listing is not for the cured compound FVMQ 70.16-01.
    - title: Handling and storage
      points:
        - label: Temperature
          line: Keep long-term service at or below 200 °C for compound FVMQ 70.16-01.
        - label: Specification
          line: Check the current drawing or specification before use, since the datasheet values are not guaranteed for specification purposes.
  why: Fluorosilicone rubber (FVMQ) is a seal elastomer chosen for low-temperature flexibility and resistance to fuels and oils. The Angst+Pfister datasheet for compound FVMQ 70.16-01 gives a minimum operating temperature of -60 °C (static) and a long-term maximum of 200 °C. NASA's outgassing table lists blue fluorosilicone O-rings and connector gaskets for spacecraft connectors. The fuel and oil claim comes from a reseller page and gives no number.
  uses:
    - where: Spacecraft connectors
      line: NASA RP-1124 lists blue fluorosilicone O-rings for connectors, for example the 70 Shore A L677-70-2-017 O-ring with application CONN O RING, and a blue fluorosilicone connector gasket to MIL R25988B.
    - where: Molded shapes, compression seals and gaskets
      line: Elastapro says MIL-DTL-25988 Type I covers O-rings, molded shapes and compression seals, and Type II covers sheet, molded strip and die-cut gaskets.
  can_do:
    - label: Low temperature
      benchmark: min_service_temp
      line: The datasheet gives a static minimum operating temperature of -60 °C, and a TR 10 low-temperature retraction value of -56.6 °C by ASTM D 1329.
    - label: High temperature
      benchmark: max_service_temp
      line: The datasheet gives a long-term maximum of 200 °C. A reseller's generic standard high temperature is 177 °C.
    - label: Hardness and density
      benchmark: hardness_shore_a
      line: Compound FVMQ 70.16-01 is 70 Shore A, plus or minus 5 by ASTM D 2240, with a density of 1.55 g/cm3.
    - label: Vacuum outgassing
      benchmark: total_mass_loss
      line: The blue 70 Shore A O-ring in NASA's table shows 0.59 % total mass loss, below NASA's 1.0 % listing limit.
  compare: The sources read give FVMQ's own values only. No comparison figures for other elastomers were fetched in this run, so this profile makes no ranking against fluorocarbon, silicone or nitrile seals. Within the FVMQ data read, the two maximum temperatures differ by source, and the outgassing rows differ by part.
  compare_rows:
    - label: Low-temperature limit
      benchmark: min_service_temp
    - label: Long-term high temperature
      benchmark: max_service_temp
    - label: Tensile strength
      benchmark: ultimate_tensile_strength
  handling:
    - Keep long-term service at or below 200 °C for compound FVMQ 70.16-01.
    - Compression set reaches 25 % after 22 h at 175 °C, so avoid long hot compression in the seal design.
    - Check the outgassing row for the exact part before use in vacuum. The 70 Shore A O-ring lost 0.59 % total mass.
    - No handling or safety data sheet advice was read for this compound in this run.
  good_for:
    - Low-temperature sealing down to -60 °C, the static minimum on the manufacturer datasheet.
    - Connector O-rings and gaskets in NASA's outgassing listing, where the 70 Shore A O-ring lost 0.59 % total mass.
  watch_out:
    - Compression set reaches 25 % after 22 h at 175 °C, so long hot exposure reduces the seal's recovery.
    - 'The two maximum temperatures differ: 200 °C long term on the datasheet and 177 °C standard on a reseller''s page.'
    - NASA's listing limits are 1.0 % total mass loss and 0.10 % collected volatile condensable material.
  verdict: FVMQ 70.16-01 is a low-temperature seal elastomer whose datasheet gives -60 °C static minimum and 200 °C long-term maximum. The sources read do not show its behaviour after long hot exposure beyond compression set, or after fuel immersion.