spore: profile
id: af
spore_version: 0.2
family: fluoropolymers
name: Amorphous fluoropolymer (Teflon AF)
abbreviation: AF
role: clear, amorphous fluoroplastic coating and optical-cladding polymer
category: polymers
type: fluoropolymers
summary: Amorphous fluoropolymer, sold by Chemours as Teflon AF, is a glassy fluoroplastic that dissolves in selected perfluorinated solvents, so it can be spun, sprayed or dipped into thin films. On the NASA MISSE 2 PEACE flight outside the ISS it eroded under atomic oxygen at 1.98e-25 cm3/atom, about the same as FEP (2.00e-25 cm3/atom) and a little more than PTFE (1.42e-25 cm3/atom), and about fifteen times less than Kapton H (3.00e-24 cm3/atom). Chemours gives a glass transition of 160 degC for its 1600 grade and a refractive index of 1.31.
best_for: Thin, low-index, optically clear and hydrophobic fluoropolymer coatings and claddings that must survive atomic oxygen in low Earth orbit
weakest_at: 'Strength and stiffness at high temperature: tensile strength falls from 26.9 MPa at 23 degC to 7.7 MPa at 220 degC, and the material decomposes above 360 degC'
identity:
  formula: Amorphous fluoropolymer; NASA repeat unit C19O6F32 for Teflon AF 1601
  cas: ''
  source: nasa-2008
  where: 'Table V (repeat-unit atom counts for AF: C19 O6 F32, 57 atoms in total); formula and molar mass 932.1414 from the AF row of the composition table in the same report'
tags:
  environments:
    - low-earth-orbit
  stresses:
    - atomic-oxygen
    - thermal-cycling
  applications:
    - optics-and-cameras
    - electronics-and-chips
properties:
  - benchmark: atomic_oxygen_erosion_yield
    label: Atomic oxygen erosion yield (MISSE 2 PEACE, ISS)
    value: 1.98e-25
    unit: cm3/atom
    scope: material
    conditions:
      grade_flown: Teflon AF 1601
      exposure: outside the ISS, MISSE 2 PEACE tray E5
      atomic_oxygen_fluence: 8.43e21 atoms/cm2
      solar_exposure: 6,300 ESH
      uncertainty: plus or minus 0.05E-25 cm3/atom (NASA/TM-2010-216903, Table 6)
    method: Mass loss measured after flight, divided by density, area and fluence, as tabulated by NASA
    status: flight
    source: nasa-2006
    where: Table 4, row 2-E5-45 (Amorphous Fluoropolymer, AF, erosion yield column)
  - benchmark: density
    label: Density (MISSE 2 PEACE sample)
    value: 2.1463
    unit: g/cm3
    scope: material
    conditions:
      grade_flown: Teflon AF 1601
    method: Density gradient column testing as described by NASA
    status: ground
    source: nasa-2006
    where: Table 4, row 2-E5-45, density column
  - benchmark: ash_mass_fraction
    label: Ash content (mass fraction of polymer that is ash)
    value: 0.0358
    unit: mass fraction
    scope: material
    conditions:
      grade_flown: Teflon AF 1601
    method: Fractional ash content measured for the MISSE 2 PEACE polymers
    status: ground
    source: nasa-2008
    where: Table II, AF row (mass fraction of polymer that is ash, Na)
  - benchmark: specific_gravity
    label: Specific gravity (grade 1600)
    value: 1.78
    unit: none
    scope: material
    conditions:
      grade: '1600'
    method: ASTM D792, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Other section, Specific Gravity row, 1600 column
  - benchmark: glass_transition_temperature
    label: Glass transition temperature (grade 1600)
    value: 160
    unit: degC
    scope: material
    conditions:
      grade: '1600'
      tolerance: plus or minus 5 degC as printed (320 degF)
    method: ASTM D3418, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Other section, Tg row, 1600 column
  - benchmark: refractive_index
    label: Refractive index (grade 1600)
    value: 1.31
    unit: unitless
    scope: material
    conditions:
      grade: '1600'
    method: ASTM D542, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Optical section, Refractive Index row, 1600 column
  - benchmark: dielectric_constant
    label: Dielectric constant (grade 1600)
    value: 1.93
    unit: unitless
    scope: material
    conditions:
      grade: '1600'
    method: ASTM D150, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Electrical section, Dielectric Constant row, 1600 column
  - benchmark: dielectric_strength
    label: Dielectric strength (grade 1600)
    value: 2.1
    unit: kV/0.1 mm
    scope: material
    conditions:
      grade: '1600'
    method: ASTM D149, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Electrical section, Dielectric Strength row, 1600 column
  - benchmark: dissipation_factor
    label: Dissipation factor (grade 1600)
    value: 0.0001
    value_high: 0.0002
    unit: unitless
    scope: material
    conditions:
      grade: '1600'
    method: ASTM D150, as printed as a range by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Electrical section, Dissipation Factor row, 1600 column
  - benchmark: optical_transmission
    label: Optical transmission (grade 1600)
    value: 95
    unit: '%'
    scope: material
    conditions:
      grade: '1600'
      note: printed as greater than 95 percent
    method: ASTM D1003, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Optical section, Optical Transmission row
  - benchmark: water_contact_angle
    label: Contact angle with water (grade 1600)
    value: 104
    unit: degrees
    scope: material
    conditions:
      grade: '1600'
    method: ASTM D570, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Chemical section, Contact Angle with Water row, 1600 column
  - benchmark: critical_surface_energy
    label: Critical surface energy (grade 1600)
    value: 15.7
    unit: dynes/cm
    scope: material
    conditions:
      grade: '1600'
    method: As printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Chemical section, Critical Surface Energy row, 1600 column
  - benchmark: moisture_absorption
    label: Water absorption (grade 1600)
    value: 0.01
    unit: '%'
    scope: material
    conditions:
      grade: '1600'
      note: printed as less than 0.01 percent
    method: As printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Chemical section, Water Absorption row, 1600 column
  - benchmark: yield_strength
    label: Yield strength at 23 degC (grade 1600)
    value: 27.4
    value_high: 28.4
    unit: MPa
    scope: material
    conditions:
      grade: '1600'
      temperature: 23 degC (73 degF)
      note: printed as 27.4 plus or minus 1.0 MPa
    method: As printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Mechanical section, Yield Strength row, 23 degC line
  - benchmark: ultimate_tensile_strength
    label: Tensile strength at 23 degC (grade 1600)
    value: 26.9
    value_high: 28.4
    unit: MPa
    scope: material
    conditions:
      grade: '1600'
      temperature: 23 degC (73 degF)
      note: printed as 26.9 plus or minus 1.5 MPa
    method: ASTM D638, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Mechanical section, Tensile Strength row, 23 degC line
  - benchmark: ultimate_tensile_strength
    label: Tensile strength at 220 degC (grade 1600)
    value: 7.7
    unit: MPa
    scope: material
    conditions:
      grade: '1600'
      temperature: 220 degC (428 degF)
      note: printed as 7.7 plus or minus 6.1 MPa
    method: ASTM D638, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Mechanical section, Tensile Strength row, 220 degC line
  - benchmark: elongation
    label: Elongation at break at 23 degC (grade 1600)
    value: 17.1
    unit: '%'
    scope: material
    conditions:
      grade: '1600'
      temperature: 23 degC (73 degF)
      note: printed as 17.1 plus or minus 5.0 percent
    method: ASTM D638, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Mechanical section, Elongation at Break row, 23 degC line
  - benchmark: elastic_modulus
    label: Tensile modulus (grade 1600)
    value: 1.6
    unit: GPa
    scope: material
    conditions:
      grade: '1600'
    method: ASTM D638, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Mechanical section, Tensile Modulus row, 1600 column
  - benchmark: flexural_modulus
    label: Flexural modulus at 23 degC (grade 1600)
    value: 1.8
    value_high: 1.9
    unit: GPa
    scope: material
    conditions:
      grade: '1600'
      temperature: 23 degC (73 degF)
      note: printed as 1.8 plus or minus 0.1 GPa
    method: ASTM D790, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Mechanical section, Flexural Modulus row, 23 degC line
  - benchmark: heat_deflection_temperature
    label: Deflection temperature at 66 psi (grade 1600)
    value: 156
    unit: degC
    scope: material
    conditions:
      grade: '1600'
      load: 66 psi
    method: ASTM D648, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Mechanical section, Deflection Temperature row, 66 psi line
  - benchmark: volume_cte
    label: Volume coefficient of thermal expansion (grade 1600)
    value: 260
    unit: ppm/degC
    scope: material
    conditions:
      grade: '1600'
    method: ASTM E831, as printed by the manufacturer
    status: ground
    source: chemours-af
    where: Typical Property Data table, Other section, Volume Coefficient of Thermal Expansion row
  - benchmark: decomposition_onset_temperature
    label: Onset of decomposition
    value: 360
    unit: degC
    scope: material
    conditions:
      note: The polymer begins to decompose above 360 degC (680 degF)
    method: Manufacturer processing guidance
    status: ground
    source: chemours-af
    where: Processing section, first paragraph (molding temperatures and decomposition warning)
corrosion:
  - environment: Low Earth orbit, atomic oxygen (MISSE 2 PEACE, ISS)
    headline: Erodes at about the same rate as FEP and a little faster than PTFE, and about fifteen times slower than Kapton H.
    effect: On the MISSE 2 PEACE tray, AF eroded at 1.98e-25 cm3/atom. In the same table FEP eroded at 2.00e-25 cm3/atom, PTFE at 1.42e-25 cm3/atom, and Kapton H at 3.00e-24 cm3/atom.
    source: nasa-2006
    where: Table 4 (rows 2-E5-42, 2-E5-43, 2-E5-45 and 2-E5-30); NASA/TM-2008-215490 introduction
    rating: unknown
  - environment: Thermal cycling on an ISS base plate
    headline: The flight tray saw a nominal base-plate range of +40 degC to -30 degC.
    effect: The MISSE 2 base-plate thermal cycling range was nominally between +40 degC and -30 degC, with occasional short excursions. The fetched pages report no AF-specific damage from this cycling, so the effect is not known from these sources.
    source: nasa-2006
    where: Section 2 (MISSE 2 flight description), thermal cycling paragraph
    rating: unknown
  - environment: Heating during processing or use
    headline: The polymer begins to decompose above 360 degC, and its tensile strength is much lower at 220 degC.
    effect: Chemours says processing above 360 degC should be avoided. At 220 degC the grade 1600 tensile strength is 7.7 MPa, against 26.9 MPa at 23 degC.
    source: chemours-af
    where: Processing section and Mechanical section of the Typical Property Data table
    rating: unknown
  - environment: Water and humid air
    headline: Takes up very little water and is strongly water-repellent.
    effect: Water absorption is printed as less than 0.01 percent, and the contact angle with water is 104 degrees for grade 1600. No corrosion or hydrolysis data for AF were found in the fetched pages.
    source: chemours-af
    where: Chemical section of the Typical Property Data table
    rating: unknown
uses:
  - application: optics-and-cameras
    device: Low-index optical cladding and anti-reflective coatings
    example: Chemours lists its use in fiber optics as a low refractive index, high temperature cladding material over silica, methacrylates, and polycarbonates.
    source: chemours-af
    where: Chemical Applications list, Optical section of the product information
  - application: electronics-and-chips
    device: Hydrophobic dielectric layer in electrowetting devices
    example: The paper made 800 nm thick amorphous fluoropolymer films by screen printing Teflon AF 1600 solution (Chemours) onto substrates for its charge-trapping and electrowetting study.
    source: arxiv-electrowetting
    where: Section on sample preparation (Methods)
risks:
  hazards:
    - text: Chemours says the resin may contain parts per million of residual hexafluoroacetone (HFA), which is readily absorbed through the skin. Residual gases including HF, COF2, CO and HFA diffuse from the resin even at room temperature and may be harmful.
      ghs: []
      source: chemours-af
      where: Handling Practices paragraph
    - text: Chemours warns that vapors can be liberated from Teflon AF that may be hazardous if inhaled.
      ghs: []
      source: chemours-af
      where: Safety Precautions box
    - text: PubChem's hexafluoroacetone record lists H330 (98.9%) Fatal if inhaled, H310 (25.1%) Fatal in contact with skin, and H314 (73.8%) Causes severe skin burns and eye damage, with signal word Danger.
      ghs:
        - H330
        - H310
        - H314
      source: pubchem-hfa
      where: GHS Classification, CID 12695
    - text: Hydrogen fluoride is named among the residual gases. PubChem's hydrofluoric acid record lists H330 Fatal if inhaled and H314 Causes severe skin burns and eye damage.
      ghs:
        - H330
        - H314
      source: pubchem-hf
      where: GHS Classification, CID 14917 (Hydrofluoric Acid)
    - text: Chemours cautions against medical use involving permanent implantation in the human body or contact with bodily fluids or tissues, unless covered by a written contract.
      ghs: []
      source: chemours-af
      where: Caution note at the end of the product information
  failure_risks:
    - source: nasa-2006
      where: Table 4, row 2-E5-45; thickness from NASA/TM-2010-216903, Table 1
      mode: Atomic oxygen erosion removes material at 1.98e-25 cm3/atom in low…
      consequence: Atomic oxygen erosion removes material at 1.98e-25 cm3/atom in low Earth orbit. The MISSE 2 film was 2 mils thick, so the film thins with fluence.
    - source: chemours-af
      where: Mechanical section of the Typical Property Data table
      mode: Strength and stiffness fall at high temperature
      consequence: Strength and stiffness fall at high temperature. Grade 1600 tensile strength is 7.7 MPa at 220 degC against 26.9 MPa at 23 degC.
    - source: chemours-af
      where: Processing section
      mode: Processing above 360 degC decomposes the polymer
      consequence: Processing above 360 degC decomposes the polymer.
  side_effects: []
  handling:
    - text: Before using Teflon AF, read the Safety Data Sheet and the Guide to the Safe Handling of Fluoropolymer Resins, as Chemours instructs.
      source: chemours-af
      where: Safety Precautions box
    - text: Avoid skin contact with the resin during processing, and wear protective gloves when handling it in manufacturing operations.
      source: chemours-af
      where: Handling Practices paragraph
    - text: Keep processing below 360 degC and use corrosion-resistant tooling, as recommended for Teflon FEP and PFA.
      source: chemours-af
      where: Processing section
  mitigations:
    - text: Keep processing temperatures below the 360 degC decomposition onset, and use corrosion-resistant tooling.
      source: chemours-af
      where: Processing section
supply:
  - subject: 'Fluorine feedstock: fluorspar (calcium fluoride, CaF2)'
    abundance: USGS estimates global mine production decreased by 1 percent to 10 million tons in 2025. The world reserves total is printed as 330,000 in the USGS table, with no unit printed beside it.
    producers:
      - country: Mexico
        share_percent: 64
    critical_lists: []
    recycling: USGS notes that synthetic fluorspar may be produced from neutralization of waste in uranium enrichment, petroleum alkylation and other processes.
    substitutes:
      - USGS lists fluorspar substitutes for some uses, such as AlF3 and HF production.
    source: usgs-fluorspar-2026
    where: 'Mineral Commodity Summaries 2026, Fluorspar: Import Sources (2021-24), World Mine Production and Reserves tables, Recycling and Substitutes paragraphs'
story:
  recipe:
    line: Amorphous fluoropolymer is a fluorine-rich polymer. NASA's composition table gives the Teflon AF 1601 repeat unit as C19O6F32, with 57 atoms per unit and a molar mass of 932.1414. Chemours says it is dissolved in certain perfluorinated solvents and then spun, sprayed or dipped into thin films.
    parts:
      - name: Carbon
        symbol: C
        role: Backbone and side-group carbon. With fluorine it forms the perfluorinated, low-polarizability structure behind the low refractive index and dielectric constant.
      - name: Oxygen
        symbol: O
        role: Ether oxygens in the ring structure. NASA counts these in its erosion model, since atomic oxygen can react with them.
      - name: Fluorine
        symbol: F
        role: Most of the repeat unit by count. Fluorine gives the chemical resistance, low surface energy and low water absorption that Chemours reports.
  risk_groups:
    - title: For people
      level: 1
      verdict: Hazards come from residual gases and vapours, not from the…
      lead: Chemours and PubChem name hexafluoroacetone, hydrogen fluoride and other residual gases as the hazard. The fetched sources do not describe the hazard of the solid polymer itself.
      points:
        - label: Residual gases
          line: Chemours says residual gases, including HF, COF2, CO and HFA, diffuse from the resin even at room temperature and may be harmful.
        - label: Medical use
          line: Chemours does not allow permanent implantation or contact with bodily fluids unless covered by a written contract.
  why: AF is a clear, amorphous fluoropolymer with a low refractive index and a low dielectric constant. On the MISSE 2 PEACE flight outside the ISS it eroded at 1.98e-25 cm3/atom, which puts it in the low-erosion group of fluoropolymers. It is a candidate where a thin, optically clear or hydrophobic coating must survive atomic oxygen in low Earth orbit.
  uses:
    - where: Use
      line: Optical cladding and anti-reflective coatings, where its refractive index of 1.31 is the reason it is used (Chemours).
    - where: Use
      line: Hydrophobic dielectric layers in electrowetting devices, as used in the arXiv paper with Teflon AF 1600 films.
  can_do:
    - label: Erosion in low Earth orbit
      benchmark: atomic_oxygen_erosion_yield
      line: The MISSE 2 PEACE measurement gives 1.98e-25 cm3/atom after an atomic oxygen fluence of 8.43e21 atoms/cm2 and about 6,300 equivalent sun hours.
    - label: Optics
      benchmark: refractive_index
      line: The grade 1600 refractive index is 1.31, and the optical transmission is printed as greater than 95 percent.
    - label: Heat
      benchmark: glass_transition_temperature
      line: The grade 1600 glass transition is 160 degC, and the deflection temperature at 66 psi is 156 degC.
  compare: AF is a low-erosion fluoropolymer. Among the MISSE 2 PEACE polymers it eroded about as much as FEP and somewhat more than PTFE, but far less than Kapton H, PEEK or polyethylene in the same MISSE 2 table. Its room-temperature strength is low. The compare rows show the three numbers that most often decide between it and the alternatives.
  compare_rows:
    - label: Erosion under atomic oxygen
      benchmark: atomic_oxygen_erosion_yield
    - label: Glass transition
      benchmark: glass_transition_temperature
    - label: Refractive index
      benchmark: refractive_index
  handling:
    - Read the Chemours safety data sheet and the Guide to the Safe Handling of Fluoropolymer Resins before use. Keep processing below 360 degC, use protective gloves, and avoid skin contact with the resin during processing, because residual HFA is absorbed through the skin.
  good_for:
    - Thin, optically clear, low-index or hydrophobic coatings and claddings that must survive atomic oxygen in low Earth orbit with less erosion than most hydrocarbon or polyimide films.
  watch_out:
    - Do not heat it above 360 degC, where it decomposes. Its strength is low at room temperature (26.9 MPa) and drops to 7.7 MPa at 220 degC. Residual HFA and other gases can be harmful.
  verdict: AF erodes slowly in low Earth orbit and is a sound choice for thin optical and hydrophobic layers. It is soft and weak, so it is a coating, not a structural material.
gaps:
  - No ionizing-radiation, ultraviolet, outgassing or thermal-vacuum result for AF was found in the fetched pages.
  - No Teflon AF safety data sheet was reached. Hazards come from the Chemours product sheet and PubChem records for hexafluoroacetone and hydrofluoric acid.
  - The MISSE 2 PEACE flight dates were not re-read in this run, so they are not stated in the file.
  - The NASA flight grade is Teflon AF 1601, but the Chemours datasheet values are for grade 1600 (and 2400 was not used). Grade differences are not resolved.
  - No production or capacity figures for Teflon AF itself were found. The supply section covers fluorspar only, the mineral feedstock for fluorine chemistry.
  - USGS does not list fluorspar as a 2025 critical mineral in the fetched text, so no critical-list entry is given.
  - Element atomic weights were not read in this run, so the recipe parts give atom counts only.
  - 'Non-canonical benchmark names used: atomic_oxygen_erosion_yield, ash_mass_fraction, water_contact_angle, critical_surface_energy, volume_cte, decomposition_onset_temperature, optical_transmission.'
  - Side effects are not stated for AF in any fetched source.
sources:
  nasa-2006:
    title: MISSE PEACE Polymers Atomic Oxygen Erosion Results (NASA/TM-2006-214482)
    id: NASA/TM-2006-214482 (de Groh and Banks, November 2006)
    url: https://ntrs.nasa.gov/api/citations/20070002707/downloads/20070002707.pdf
    year: 2006
    kind: report
    license: NASA technical report (public)
  nasa-2008:
    title: Atomic Oxygen Erosion Yield Predictive Tool for Spacecraft Polymers in Low Earth Orbit
    id: NASA/TM-2008-215490 (Banks, Backus and de Groh, December 2008)
    url: https://ntrs.nasa.gov/citations/20090011780
    year: 2008
    kind: report
    license: NASA technical report (public)
  nasa-2010:
    title: MISSE 2 PEACE Polymers Experiment Atomic Oxygen Erosion Yield Error Analysis
    id: NASA/TM-2010-216903
    url: https://ntrs.nasa.gov/api/citations/20100040422/downloads/20100040422.pdf
    year: 2010
    kind: report
    license: NASA technical report (public)
  chemours-af:
    title: Teflon AF Amorphous Fluoroplastic Resins product information
    id: Chemours Teflon AF product information
    url: https://www.teflon.com/en/-/media/files/teflon/teflon-af-product-info.pdf
    kind: datasheet
    license: Manufacturer product information (cited, not reproduced)
  usgs-fluorspar-2026:
    title: 'Mineral Commodity Summaries 2026: Fluorspar'
    id: USGS Mineral Commodity Summaries 2026
    url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-fluorspar.pdf
    year: 2026
    kind: report
    license: US government work (public domain)
  pubchem-hfa:
    title: 'PubChem: Hexafluoroacetone (CID 12695), GHS classification'
    id: PubChem CID 12695
    url: https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/12695/JSON
    kind: database
    license: PubChem (NIH, public)
  pubchem-hf:
    title: 'PubChem: Hydrofluoric Acid (CID 14917), GHS classification'
    id: PubChem CID 14917
    url: https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/14917/JSON
    kind: database
    license: PubChem (NIH, public)
  arxiv-electrowetting:
    title: Electrically controlled localized charge trapping at amorphous fluoropolymer-electrolyte interfaces
    id: arXiv:1909.09424 (Wu, Dey, Siretanu, van den Ende, Shui, Zhou, Mugele)
    url: https://arxiv.org/pdf/1909.09424
    year: 2019
    kind: paper
    license: arXiv preprint (cited)
documents:
  - title: 'NASA/TM-2008-215490: Atomic Oxygen Erosion Yield Predictive Tool for Spacecraft Polymers in Low Earth Orbit'
    type: report
    url: https://ntrs.nasa.gov/citations/20090011780
    year: 2008
  - title: 'NASA/TM-2006-214482: MISSE PEACE Polymers Atomic Oxygen Erosion Results'
    type: report
    url: https://ntrs.nasa.gov/api/citations/20070002707/downloads/20070002707.pdf
    year: 2006
  - title: 'NASA/TM-2010-216903: MISSE 2 PEACE Polymers Atomic Oxygen Erosion Yield Error Analysis'
    type: report
    url: https://ntrs.nasa.gov/api/citations/20100040422/downloads/20100040422.pdf
    year: 2010
  - title: Chemours Teflon AF Amorphous Fluoroplastic Resins product information
    type: datasheet
    url: https://www.teflon.com/en/-/media/files/teflon/teflon-af-product-info.pdf
  - title: 'USGS Mineral Commodity Summaries 2026: Fluorspar'
    type: report
    url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-fluorspar.pdf
    year: 2026
  - title: 'PubChem: Hexafluoroacetone (CID 12695), GHS classification'
    type: database
    url: https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/12695/JSON
  - title: 'PubChem: Hydrofluoric Acid (CID 14917), GHS classification'
    type: database
    url: https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/14917/JSON
  - title: Electrically controlled localized charge trapping at amorphous fluoropolymer-electrolyte interfaces (arXiv:1909.09424)
    type: paper
    url: https://arxiv.org/pdf/1909.09424
    year: 2019
license: CC-BY-4.0
updated: '2026-10-20'
review:
  status: draft
  method: assistant
  checked_values: 22
  unreachable: 0
  caveats: 1
  note: 'Written by an AI assistant on 2026-10-20 from pages fetched in this run: NASA/TM-2006-214482 Table 4, NASA/TM-2008-215490 Tables I, II and V, NASA/TM-2010-216903 Tables 1 and 6, the Chemours product information PDF, USGS MCS 2026 fluorspar, PubChem CID 12695 and 14917, and arXiv:1909.09424. Flight dates from the passport were not re-read.'