Rules that affect what you can buy
Targeted PFAS testing missed more than 85% of the organic fluorine actually present in a published comparison. There is a test that catches all of it, two regulators already use it, and cookware brands do not publish it.
There is a laboratory test that would answer the question “does this pan contain fluorinated chemicals?” in one number. It is not new, it is not expensive by industrial standards, and two regulators have already written it into law.
Almost no cookware brand publishes it. This article is about why that is, and why the absence is itself informative.
When a company says its cookware was “tested for PFAS”, it almost always means a targeted test — typically LC-MS/MS, which looks for specific named molecules and reports how much of each it found.
The catch is that a targeted method can only find what it has a reference standard for. That is somewhere between a few dozen and about seventy compounds, against an estimated universe of more than ten thousand PFAS structures. Everything else — unnamed processing aids, degradation products, the polymer itself — is invisible to it.
So “we tested for PFAS and found none” can be entirely true and still leave most of the fluorine in the product unaccounted for.
Hu, Cochran, Grim and Rumachik (2025), in the Journal of AOAC International, compared targeted extraction against total fluorine measurement in food-contact materials. Their finding, stated plainly in the paper: “extractable organic fluorine constitutes less than 15% of the TOF”.
Read that again. In the materials they tested, the targeted methods captured under a sixth of the organic fluorine actually present. More than 85% was invisible to the test brands rely on.
TOF is measured by combustion ion chromatography. You burn the sample, capture the fluoride, measure the total, and subtract the inorganic fraction. What is left is all organic fluorine, whether or not anyone knows what molecule it came from.
It is a blunt instrument, and that is the point. It cannot tell you which PFAS is present. It can tell you that fluorinated chemistry is there at all, which is the question a shopper actually has. The method Hu and colleagues describe detects down to 0.51 parts per million — comfortably sensitive for regulatory thresholds.
This is the strongest argument that TOF is the right screen: when regulators had to write an enforceable rule, neither of them chose a targeted compound list.
Note the scope carefully, because it gets misreported: the EU rule covers packaging, not reusable cookware. It does not touch a frying pan. But it is the clearest signal yet that total fluorine is where enforcement is heading, and that fluoropolymers are expected to count toward it.
There is a legitimate reason and a less legitimate one, and it is worth separating them.
The legitimate one: TOF cannot tell you why the fluorine is there. A pan with a disclosed, intentional PTFE coating and a pan with undisclosed fluorinated contamination can return a similar number. As a communications tool it is genuinely ambiguous, and a high reading on an honestly PTFE-coated pan would tell you nothing you did not already know.
The less legitimate one: for any product that does use a fluoropolymer coating, TOF is the test most likely to contradict the marketing. PTFE registers as organic fluorine whether or not PFOA is present. A “PFOA-free” claim survives a targeted test easily and does not survive a TOF number nearly as comfortably.
That gap is not hypothetical. The Ecology Center’s “What’s Cooking?” testing reported that 79% of the non-stick cooking pans they tested had PTFE coatings — and that most pans labelled “PFOA-free” did not disclose the PTFE coating itself. We have not been able to confirm the exact method they used, so treat the percentage as their reported figure rather than one we have verified.
We are not demanding TOF specifically. Any of these would move a brand up on our testing score: a named laboratory, a dated certificate you can open, a stated total-fluorine result, or simply an honest sentence saying “this pan has a PTFE coating”. The last one costs nothing and almost nobody writes it.
Disclosure is improving slightly, for a dull reason: California now requires cookware companies to state on their websites whether they use PFAS. A proposed outright sales ban, SB 682, was vetoed in 2025 — the disclosure duty is what remains. EWG has been compiling the resulting disclosures, though that directory is self-reported by brands rather than independently lab-verified, which is a meaningful limitation.
So the practical move is unglamorous: check the manufacturer’s own PFAS disclosure page before you buy, and treat “free of” language on the packaging as marketing until the disclosure page agrees with it.
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