The Verdict List

Ingredient glossary

Avoid entirely

PFAS

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Researched & reviewed by The Verdict List Editorial Team

What it is

PFAS ("per- and polyfluoroalkyl substances") is a family of thousands of manufactured chemicals that share a carbon-fluorine backbone, one of the strongest bonds in organic chemistry. That bond is why they're used for water, oil, and stain resistance, and why they've earned the nickname "forever chemicals": many resist breaking down in the environment, while persistence in people varies by compound. In household and baby products, PFAS most often shows up as a water-repellent or grease-resistant treatment, sometimes intentionally added and sometimes present as a processing-aid contaminant that isn't on the ingredient list at all.

Why it's flagged

The International Agency for Research on Cancer classifies PFOA as carcinogenic to humans (Group 1) and PFOS as possibly carcinogenic to humans (Group 2B). Those are hazard classifications, not a product-specific dose or risk estimate. U.S. EPA drinking-water rules set legally enforceable maximum contaminant levels for several named PFAS, including 4 parts per trillion for PFOA and PFOS; that drinking-water standard cannot be directly applied to a finished diaper, wipe, or fabric. Some PFAS persist in people and the environment, while half-lives and health evidence vary across the large PFAS family. Repeated exposure can matter, but the exposure route, compound, concentration, duration, and absorption all still need to be considered.

How concerned to be

Our precautionary guidance addresses intentional PFAS treatments in diapering and similar contact products where a product-specific disclosure or reliable test identifies them. The PFAS family also includes finished fluoropolymers such as PTFE; that classification alone does not establish the same exposure or risk for cookware as for small-molecule PFAS. The separate PTFE entry covers normal cooking, overheating and manufacturing-related concerns. A non-detect organic-fluorine screen is evidence about that sample and method, not proof that every PFAS compound is absent. Total or organic fluorine is a screening measurement and cannot identify a particular PFAS compound without targeted follow-up. Labels and certifications answer narrower questions: the 2026 OEKO-TEX Standard 100 rules include defined PFAS and total-fluorine requirements for covered components, but a certificate does not automatically establish that every component of every package generation is PFAS-free. A 2023 investigation sent 65 diapers and diapering accessories from 40 brands to an EPA-certified laboratory; 15 products exceeded that laboratory's organic-fluorine reporting threshold, including six of 35 disposable diapers. The reported range was 10–323 parts per million. Those results are screening findings, not proof that a named PFAS caused exposure or harm from a particular product.

What it's called on a label

Look for any of these on an ingredient list: Forever chemicals, PFOA, PFOS, Per- and polyfluoroalkyl substances, Fluoropolymer, PTFE, Teflon, Perfluoro-, Polyfluoro-, Water-repellent finish (unspecified).

Laboratory screening measurements

Organic fluorine, Total organic fluorine are measurements, not ingredient names or aliases for PFAS. A screen cannot identify a particular PFAS compound; interpretation depends on the sample, method and reporting limit.

For the distinct scope of polymer cookware, read the PTFE entry. Our concern labels are guidance for the uses described, not product-specific exposure or risk estimates.

Sources

  1. PFAS Explained, U.S. Environmental Protection Agency (2024)
  2. IARC evaluation of PFOA and PFOS, International Agency for Research on Cancer (2023)
  3. Standard 100 by OEKO-TEX, current standard and limits, OEKO-TEX Association (2026)
  4. IARC Monographs Volume 135: Perfluorooctanoic acid (PFOA) and Perfluorooctanesulfonic acid (PFOS), International Agency for Research on Cancer, World Health Organization (2025)
  5. Assessment of the risks associated with corporal exposure to chemical substances present in disposable diapers for babies, French Agency for Food, Environmental and Occupational Health & Safety (ANSES) (2019)
  6. Disposable & Cloth Diapers Tested For Indications of PFAS ("Forever Chemicals"), Mamavation, in partnership with Environmental Health News (EHN.org) (2023)