PTFE, PFA, and FEP: What's Actually in a Nonstick Coating

PTFE is the coating on most traditional nonstick pans, and PFA and FEP are its close chemical relatives. This guide explains what PTFE is, how the three materials differ, and why all of them belong to the PFAS family.

At a Glance

• PTFE is the classic nonstick coating. It is a plastic made of a carbon chain fully wrapped in fluorine, best known under the Teflon brand.
• PFA and FEP are PTFE with small side branches. The branches let them melt and flow, so coating makers often blend them into the lower layers of a nonstick finish.
• All three are PFAS. Each is built from fully fluorinated carbon atoms, which places it in the PFAS family under the OECD definition and under state laws such as Minnesota's.
• Names like "granite," "stone," or "titanium" describe the look or added particles, not the polymer that holds them together.
• "PFAS-free" is the label that rules out all three. "PTFE-free" on its own still leaves PFA and FEP open.

What Is PTFE?

PTFE (polytetrafluoroethylene) is a plastic made of long chains of carbon atoms, each fully surrounded by fluorine. That fluorine shell makes it extremely slippery and resistant to heat and chemicals, which is why it became the standard nonstick coating. Teflon is its best-known brand name.

Why PTFE Is So Slippery

Fluorine holds its electrons very tightly, so a surface covered in fluorine has almost nothing for other molecules to grip. Water, oil, and egg proteins bead up and slide off instead of bonding to the pan.

The same tight shell makes PTFE hard to work with. It melts at about 327 °C (621 °F), but the melted plastic is too thick to flow, so it cannot be molded like ordinary plastics. Cookware coatings are instead sprayed on as a fine liquid dispersion and baked; one DuPont patent cures them at 427 °C (800 °F).

A DuPont chemist, Roy Plunkett, discovered PTFE by accident in 1938. The first Teflon-coated bakeware reached the public in 1951.

What Are PFA and FEP?

Both are copolymers, meaning their chains are built from two kinds of building blocks. Most of each chain is identical to PTFE. Every so often, a building block carries a short side branch.

FEP

Full name: fluorinated ethylene propylene.
Structure: the PTFE chain with an occasional –CF₃ branch, a carbon capped with three fluorines.
Melts at: about 260 °C (500 °F), and flows when melted.

PFA

Full name: perfluoroalkoxy alkane.
Structure: the PTFE chain with an occasional fully fluorinated branch attached through an oxygen atom.
Melts at: about 310 °C (590 °F), and flows when melted.
Note: PFA is one material. PFAS, with an S, is the whole family it belongs to.

The branches are the whole difference. They keep the chains from packing tightly, so the melted plastic can flow, bond, and seal. That makes PFA and FEP useful wherever PTFE alone is hard to process.

How PTFE, PFA, and FEP Work Together in a Coating

A nonstick finish is usually several thin layers, not one. A 1993 DuPont patent for a scratch-resistant cookware coating shows a typical design:

• Primer: PTFE blended with FEP or PFA, a heat-resistant binder that grips the metal, and hard aluminum oxide particles.
• Midcoat: mostly PTFE with some FEP or PFA, plus more hard particles.
• Topcoat: PTFE only, the slippery surface that touches food.

The meltable copolymers help the layers fuse during baking, and the particles add scratch resistance. This is why marketing names such as "granite," "stone," "diamond," or "titanium" can't tell you what the coating is made of. They describe color, texture, or particles, while the material binding them could still be a fluoropolymer. The brand's material disclosure is what names it.

Is PTFE a PFAS?

Yes, and so are PFA and FEP. The OECD, which sets widely used chemical definitions, counts any substance with a fully fluorinated carbon (a –CF₂– or –CF₃ group) as a PFAS. These three fluoropolymers are built almost entirely of such groups.

State laws use the same idea. Minnesota defines PFAS as chemicals with at least one fully fluorinated carbon atom, and has banned the sale of cookware with intentionally added PFAS since January 1, 2025.

Scientists do debate how fluoropolymers should be regulated. One review argues they are "polymers of low concern": very large molecules, over 100,000 daltons, that are practically insoluble in water and too big to cross cell membranes. Other researchers argue against a blanket exemption, because PFAS can be released while fluoropolymers are made and when they are thrown away.

Where the PFAS Questions Come From

• Manufacturing: PTFE, FEP, and PFA were historically made with salts of PFOA as a processing aid. Replacements such as GenX and ADONA are also PFAS. Our guide to what "PFOA-free" really rules out covers this history.
• Overheating: PTFE can start to give off fumes above about 260 °C (500 °F), and the coating breaks down faster above about 350 °C (662 °F), temperatures an empty pan on high heat can reach. Manufacturers generally advise keeping PTFE pans below 260 °C (500 °F).
• Wear: a 2022 lab study estimated that a single crack in a PTFE coating can release about 9,100 plastic particles. What this means for health is not yet known.
• Disposal: fluoropolymers do not break down in the environment, so their end of life is part of the debate.

How to Tell Which Coating a Pan Has

1. Look for the material by name. PTFE, PFA, FEP, and "fluoropolymer" all point to a PFAS coating; "ceramic (sol-gel)" points to a silica-based one.
2. Treat "PFOA-free" alone as a sign of PTFE. In a 2020 Ecology Center study, 79% of the nonstick cooking pans tested were PTFE-coated, and most pans labeled "PFOA-free" did not disclose it.
3. Check the brand's PFAS disclosure. California's AB 1200 requires cookware brands to disclose intentionally added PFAS on their websites. Our product profiles, such as the HexClad Hybrid Fry Pan profile, gather each pan's coating and any published PFAS tests in one place.
4. Prefer "PFAS-free" with evidence. A disclosure stating no intentionally added PFAS, or published lab results, confirms the claim. See our overview of PFAS-free certifications for what each one checks.

The Bottom Line

PTFE, PFA, and FEP are three versions of the same fluorinated chain, and all three are PFAS. If you want a pan without them, look for "PFAS-free" or "made without PFAS" backed by a disclosure, or choose an uncoated material from our beginner's guide to PFAS-free cookware. Compare six nonstick pans by coating and evidence.

Sources

1. Science History Institute. Roy J. Plunkett.
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3. Batzar, K. (E. I. du Pont de Nemours and Company). Cookware coating system. U.S. Patent 5,250,356 (1993).
4. Emerson. PTFE and PFA: Similarities and Differences (white paper).
5. OECD. Reconciling Terminology of the Universe of Per- and Polyfluoroalkyl Substances: Recommendations and Practical Guidance (2021).
6. Minnesota Legislature. Minnesota Statutes 116.943: Products Containing PFAS.
7. Interstate Technology and Regulatory Council (ITRC). PFAS: Chemistry, Terminology, and Acronyms.
8. Henry, B. J., et al. (2018). A critical review of the application of polymer of low concern and regulatory criteria to fluoropolymers. Integrated Environmental Assessment and Management, 14(3), 316–334.
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11. Ecology Center. What's Cooking? Nonstick pan study (2020).
12. California Attorney General. Enforcement Advisory: AB 1200, PFAS in Cookware and Food Packaging (2023).
13. Singapore Food Agency. Safe practices for non-stick pans.