Non-Toxic Rice Cookers: What the Makers’ Own Chemical Filings Say

What does the rice actually touch in a rice cooker?

Mostly the inner pot, which is where coatings and marketing both focus. It is usually aluminium, for fast, even heating, with a nonstick coating on the inside. Some premium models add stainless or iron layers for induction heating. Above the rice there is an inner lid, a rubber or silicone gasket, and a steam vent or cap, and condensation drips from all of them back onto the rice. Those parts are rarely disclosed, but the pot is the big surface, so that is where to start.

What do the makers’ own chemical filings say?

Since 2023, California’s cookware law (AB 1200) has required manufacturers to publish online any intentionally added chemicals from the state’s designated lists. PTFE and other PFAS are on those lists. The filings are dry spreadsheets, but they are the manufacturers’ own statements, and they are more specific than the marketing. Here is what the main rice-cooker makers disclose, alongside what their product pages say:

Tiers rank what the rice touches by known fluoropolymer and plastic contact. They are not health scores. Filings list chemicals present in a product and don’t always say which part. Zojirushi’s ties PTFE and PFA to the nonstick surface; Tiger’s JKT-D entry does not name the part. Models and filings change, so check the current disclosure for your exact model number.

When “ceramic” or “stainless” doesn’t mean what you think

Two traps catch most shoppers. The first is “ceramic”. Tiger’s JKT-D induction cooker is marketed with a “3 layer metal inner pot with ceramic coating”, yet Tiger’s own state filing lists PFAS for the JKT-D10U and JKT-D18U. By contrast, Tiger’s JBT-B and JBS-A55U, sold as “Environmentally Friendly Ceramic Coated”, list only aluminium and isopropanol. The same word can cover two different chemistries in one brand’s range.

The second is “stainless”. It can describe the outer body, or a stainless pot that has a nonstick layer applied on top. Cuckoo’s CRP-P0609S, for example, has a “stainless steel inner pot with nonstick coating”. An uncoated stainless pot is silver and shiny inside, and it is marketed as uncoated or “no coating”. If the inside is black, grey or glossy, there is a coating.

Is a nonstick rice-cooker pot actually a problem?

Less than a nonstick frying pan, for one reason: temperature. A rice cooker runs near the boiling point of water for most of its cycle, far below the roughly 260 °C where PTFE starts to break down, so overheating fumes aren’t the realistic risk. Wear is. Researchers imaging scratched nonstick cookware estimated that “thousands to millions” of fluoropolymer micro- and nanoplastics might be released in a simulated cooking process. Rice cookers are gentle on coatings, but years of paddles, scouring and washing rice in the pot add up. Makers know it. Tiger’s JBT-B manual says: “Be careful not to scratch the inner pot when washing rice”, warns that the coating “may wear and peel with extended use”, and says not to use metal spatulas or nylon scouring sponges.

Coating-free doesn’t come free, and Tiger’s PFAS-free manual is unusually candid about it: “As this product complies with PFAS regulations, rice tends to stick to the inner pot more easily than with products coated with fluorocarbon resins.” Stainless pots stick more still. Most owners manage with a short soak, a little oil for sticky rice, or letting the rice rest on keep-warm before serving.

Does a stainless steel pot leach metal into rice?

A little, far less than with acidic foods. In the best-known study, tomato sauce cooked 6 hours in stainless picked up up to 26-fold more nickel and 7-fold more chromium, most from new steel, settling after about six cycles. Rice is near neutral and cooks in under an hour, a much gentler case. With a nickel allergy, run a few cycles through a new pot first.

Are clay-pot rice cookers safer?

Only if you know the glaze. Clay has no plastic, but glazes can contain lead, and heat helps it move. A 2026 study of traditional Mexican cookware found that rice cooked for 30 minutes in lead-glazed pots picked up 1.27 ppm of lead, above Mexico’s 0.5 ppm limit. Pots with lead-free glazes leached little. The FDA warns that washing and boiling don’t remove lead from pottery. Branded donabe and unglazed clay cookers aren’t the same as traditional lead-glazed ware, but most don’t publish leach-test results either. Before trusting one with daily rice, ask the seller for a lead and cadmium leach test rather than a total-content test.

What matters more than the pot: the rice

Swap the pot and you remove one source. Change how you prepare rice and you address another that is already in the grain. In an Australian study of store-bought rice, washing cut measured plastic from 3.7 mg to 2.8 mg per 100 g serving. Instant, pre-cooked rice carried about four times more plastic than regular rice, and paper packaging was no better than plastic. Rinse rice in a separate bowl or sieve rather than scrubbing it inside a coated pot. That lowers what’s in the rice and spares the coating. The full evidence is in microplastics in rice.

How to choose a lower-exposure rice cooker

1. Look for an uncoated stainless pot described as such. “304 stainless cooking pot” or “no coating”, not just a stainless exterior.
2. Check the maker’s chemical disclosure for your model number. Search the brand name plus “AB 1200”. If PTFE, PFA or PFAS is listed, the pot is fluoropolymer-coated whatever the marketing says.
3. If you prefer nonstick, choose a PFAS-free ceramic backed by a filing, and expect it to wear faster and stick a little more.
4. Treat coatings as consumables. Replace the inner pot when the coating is scratched through, flaking or peeling. Most makers sell replacement pots.
5. Rinse rice in a bowl, not the coated pot, and use the plastic or wooden paddle, never metal.
6. Skip unlabelled glazed clay unless the seller can show a leach test.

Related: the best non-toxic cookware, what “ceramic” coatings really are, and how HexClad moved from PTFE to ceramic.