PFOA (C-8) and DuPontIn early 2006 the Environmental Protection Agency (EPA) asked eight American companies, including DuPont, maker of Teflon-brand nonstick cookware, to work towards the elimination of PFOA—which they labeled a likely carcinogen—by 2015. PFOA has been shown to cause cancer, low birth weight and a suppressed immune system in laboratory animals exposed to high doses of PFOA. Studies have shown the chemical to be present at low levels in the bloodstream of 9 out of 10 Americans, and in the blood of most newborns. And although the effects of PFOA at lower doses in humans are disputed, there does seem to be a link between PFOA and raised levels of cholesterol. More seriously, some people have claimed that PFOA exposure caused birth defects in babies born to mothers working at a Teflon plant in the early 1980s.
How the chemical is transmitted to humans is unclear, and, thus far, there’s no evidence that nonstick cookware in particular is to blame. But DuPont has been in the cross-hairs of the EPA for some time, and was heavily fined for allegedly hiding data for many years on the toxicity of PFOA, and also for contaminating the Ohio River drinking-water supply near its West Virginia plant.
Feeling the HeatBack to nonstick pans. Both DuPont and the EPA say that cooks have little to worry about if they use nonstick cookware properly.
There’s little dispute that, above certain temperatures—hotter than the smoke point of cooking oils or the point where food is burned—the nonstick coating will break down and release toxic fumes. Any surface that’s subject to extreme temperature will give off toxic gases. According to DuPont, cookware with Teflon nonstick coating has a recommended maximum use temperature of 500 degrees Fahrenheit and that significant decomposition of the coating will occur only when temperatures exceed about 660 degrees Fahrenheit, which could easily happen if nonstick pans were left dry or empty on a hot burner.
Cook's Illustrated magazine (link is subscription only) reported on tests of nonstick skillets in its May/June 2005 issue, and found that such extreme temperatures could even be reached by cooking some foods on high heat (such as stir-fries). In most cases, the top temperature registered for only a second or two, falling by as much as 200 degrees as the food was moved around the pan. In 2003 the Environmental Working Group (EWG) reported that nonstick coatings "could reach 700 degrees Fahrenheit in as little as 3-5 minutes, releasing 15 toxic gases and chemicals, including two carcinogens." The release of toxic fumes from nonstick cookware is known to kill pet birds at much lower temperatures—as low as 464 degrees Fahrenheit, according to the EWG.
Nonstick Cookware and PFOABut while PFOA is used to bond the coating of nonstick cookware, DuPont claims that this particular chemical is subsequently destroyed in the heating process in manufacturing, and not present in the finished nonstick surface. Trace elements of PFOA were found in one extreme test where the surfaces of the pans were ground up, but today’s nonstick coated pans are tougher than ever before and can withstand less careful handling than previous generations of nonstick cookware.
Stick with NonstickThere are two issues here: 1) whether PFOA is present in nonstick cookware, and 2) the emission of PFOA into the environment. As far as cookware is concerned, there seems little reason to toss our nonstick pots and pans just yet. Under normal use, the pans are almost certainly safe. As far as DuPont’s, and other chemical companies’, responsibility to the environment is concerned, it seems that appropriate action is being taken to ensure that emissions of PFOA will be all but eliminated within 10 years. Whether the use of PFOA in nonstick coatings and other products will be completely phased out over time is unclear, although companies including DuPont are said to be looking for suitable alternatives.
Using Nonstick Cookware Safely
- Never leave nonstick pans unattended on an open flame or other heat source
- While cooking, don’t let temperatures get hotter than 450 degrees
- Don’t use metal utensils on nonstick cookware
- Wash nonstick cookware by hand using nonabrasive cleaners and sponges (do not use steel wool)
- Don’t stack nonstick cookware on top of each other
- Keep pet birds out of the kitchen