Cookware That Isn't Teflon: Cast Iron, Stainless, and Carbon Steel Compared

If you're avoiding nonstick coatings entirely, three materials cover almost every cooking task: cast iron, stainless steel, and carbon steel. They're not interchangeable. Each has a different heat behavior, a different care routine, and a different price point.

Cast iron holds heat best and is cheapest to buy, but it's heavy and needs seasoning upkeep. Stainless steel is the lowest-maintenance and best for acidic foods like tomato sauce. Carbon steel heats up fastest and is lighter than cast iron, but rusts more easily if left wet. None of the three involve PTFE or PFAS coatings.

How do cast iron, stainless steel, and carbon steel actually compare?

Why avoid Teflon-style nonstick coatings in the first place?

To be clear about what's actually settled science: PFOA, the manufacturing chemical originally linked to health concerns in nonstick production, was voluntarily phased out by major US cookware makers under an EPA stewardship program, with full elimination by 2015 and Teflon-brand products PFOA-free since 2013, according to the EPA's fact sheet on the program. Modern PTFE coatings sold in the US today generally don't contain PFOA.

The reason some people still choose to skip nonstick coatings isn't PFOA. It's that PTFE itself is still classified within the broader PFAS chemical family, and PTFE coatings degrade and release fumes when overheated, generally above 500°F, according to reporting compiled by Healthline's review of nonstick safety research. Six US states (Colorado, Connecticut, Maine, Minnesota, Rhode Island, and Vermont) have passed laws restricting PFAS in cookware sold within their borders, which reflects a precautionary stance on the broader PFAS category rather than a finding that intact, normally used nonstick pans are actively dangerous.

Which material should you pick for which task?

Cast iron: best for heat retention and searing

Cast iron's thick walls hold and radiate heat evenly once hot, which makes it well suited to searing steaks, frying chicken, and oven-finished dishes. Its main drawbacks are weight and the need to keep a seasoning layer intact. According to Made In's comparison guide, cast iron and carbon steel both build a naturally nonstick surface through seasoning, an oxidized layer of polymerized oil, unlike stainless steel which has no such coating.

Stainless steel: best for acidic food and low maintenance

Stainless resists corrosion and doesn't react with acidic ingredients like tomatoes, wine, or citrus, which can strip the seasoning off cast iron or carbon steel over time. It's the most dishwasher-friendly of the three and requires no seasoning routine, though food can stick more without enough fat or preheating.

Carbon steel: best for fast, high-heat cooking

Carbon steel is essentially a thinner, lighter cousin of cast iron with a similar seasoning process. According to America's Test Kitchen's comparison, carbon steel heats up and cools down faster than cast iron, which makes it popular for stir-frying and dishes that need quick heat adjustments, but its higher iron content also makes it more prone to rust if left wet.

What about ceramic-coated pans?

Ceramic-coated cookware is often marketed as the nonstick alternative, but it's worth knowing what it actually is: a silica-based coating (not the PTFE polymer used in traditional nonstick), typically free of PFAS by design. It's generally considered safe, but the coating tends to lose its nonstick performance faster than PTFE, often within a year or two of regular use, and can't be restored once it degrades. If you want a truly nonstick pan without PTFE, ceramic is a reasonable option; if you want maximum durability, cast iron, stainless, or carbon steel will outlast it.

How do you keep any of these pans out of the landfill for decades?

• Season cast iron and carbon steel after each use with a thin layer of neutral oil, and store them dry.
• Avoid soaking cast iron or carbon steel in water; hand wash and dry immediately.
• Let stainless steel preheat before adding fat and food to reduce sticking without needing a coating at all.
• Buy the heaviest gauge you can afford. Thin, cheap versions of any of these three warp faster under high heat.

Frequently Asked Questions

Is cast iron actually nonstick?

A well-seasoned cast iron pan develops a naturally nonstick surface over time from polymerized oil, though it won't match a fresh PTFE or ceramic coating for eggs and delicate foods until the seasoning is well built up.

Which is easiest for a beginner: cast iron or carbon steel?

Stainless steel is actually the easiest to maintain since it needs no seasoning at all. Between cast iron and carbon steel, cast iron is more forgiving because it's more forgiving of uneven heat and less prone to warping, while carbon steel rewards more practice with heat control.

Do I need to throw away my nonstick pans to be safe?

No. Modern PTFE nonstick cookware sold in the US is PFOA-free and considered safe for normal cooking. Replace a nonstick pan when its coating is visibly scratched or flaking, or if you simply prefer to avoid PFAS-family materials altogether.

Sources

• Fact Sheet: 2010/2015 PFOA Stewardship Program, EPA
• Is Nonstick Cookware Like Teflon Safe to Use?, Healthline
• Cast Iron vs. Stainless Steel Cookware, Made In
• Carbon Steel vs. Cast Iron, America's Test Kitchen
• Poisoned Legacy, Environmental Working Group