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Glass & Cotton

Materials

Every claim on this site resolves to a material

Brands change, coatings get renamed, and marketing cycles turn over every two years. The materials do not.

Close-up of brushed metal surface texture under hard light

Start here

Start with the comparison table

One table, every cookware material, with PFAS status, maximum safe heat, the actual leaching concern and realistic lifespan. It is the most useful page on this site.

See the picks

A brand name tells you who assembled a product. A material tells you what will happen to it at 450F, in contact with tomato, after two years of dishwasher cycles. The second is the durable information, which is why this section exists and why every pick elsewhere on the site links back into it.

Each page here follows the same shape: what the material actually is, what the evidence says about what comes off it, where its heat limit is and how it fails when you exceed it, how long it realistically lasts, and the care that extends that life. Then two roundups where that material is the right answer.

We label the provenance of every claim. A regulator or standards body is cited directly. Published research is cited by author and journal. A manufacturer's specification is labeled as a manufacturer claim, because that is what it is — the company's own account of its own product, which is useful and is not the same as verification.

How to read a material page

  • Composition first. "Ceramic non-stick" is not a material; it is a category containing a metal body and a sol-gel coating. Both matter and they fail differently.
  • Heat limit, then failure mode. Every material has a temperature where something changes. What changes — the coating degrades, the oil polymerizes, the glass shatters, the metal warps — determines whether exceeding it is a nuisance or a hazard.
  • Lifespan, stated as a range. A coating that lasts one to three years is not defective. It is a consumable, and the honest way to price a coated pan is per year.
  • What it is wrong for. Every material on this list is the wrong choice for something, and knowing which thing is more useful than any ranking.

The short version, if you read nothing else

Stainless steel for most cooking. Cast iron or carbon steel for searing and for anything you want to last a lifetime. Enameled cast iron for acidic braises. Glass and stoneware for baking and storage. Solid ceramic if you want neither metal nor coating and can accept slow, fragile cookware. A sol-gel ceramic coating if you want non-stick without PTFE and accept a replacement cycle. PTFE if you want the best non-stick performance available and will keep it off high heat — and not at all if there is a bird in the house.

That is the whole category in six sentences. The pages below are for when you want to know why.

Why this section is the site's foundation

The commercial pages on this site go out of date. A product gets discontinued, a brand reformulates a coating, a set stops being sold in the size we recommended. The material pages do not go out of date, because the chemistry of 304 stainless in contact with acetic acid is the same this year as last.

That is also why these pages carry the citations. If you only trust one part of this site, trust the parts where we have linked you to EPA, FDA, OEHHA, NSF and the primary literature and invited you to read them yourself.

Everything in Materials

Questions people actually ask

What is the safest cookware material overall?

For general cooking, uncoated stainless steel — it has no coating to wear off and no seasoning to maintain, and its measured nickel and chromium transfer is small outside long acidic cooks. For acidic braising, enameled cast iron. For searing and longevity, bare cast iron or carbon steel. The comparison table sets them side by side.

Are ceramic coatings really PFAS-free?

A sol-gel ceramic coating is a silicon-based mineral coating and contains no PTFE. Whether a given product's full construction is free of all PFAS is a claim only the manufacturer or a lab can support, which is why we label it as a manufacturer claim unless a third party has published testing.

How long should a non-stick pan last?

One to three years of regular use for most ceramic coatings, somewhat longer for a well-treated fluoropolymer pan. Any coated pan that is scratched, flaking or has gone chalky has reached the end of its life regardless of age.

Sources

  1. Kamerud, Hobbie and Anderson (2013), Stainless Steel Leaches Nickel and Chromium into Foods During Cooking, Journal of Agricultural and Food Chemistry
  2. Science News — Sticky situation: nonstick surfaces can turn toxic at high heat
  3. US FDA — compliance policy guidance on lead in ceramicware (ASTM C738 leach test)
  4. US EPA — Our Current Understanding of the Human Health and Environmental Risks of PFAS — Regulator overview of PFAS persistence and health endpoints