by 
The Curious Bag
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<h4 class="dechead">On One Hand: Heat releases chemicals
According to experts at the Good Housekeeping Research Institute, high heat causes the breakdown of the nonstick coating on a pan. Chemicals in the nonstick coating turn into dangerous fumes, which can cause flu-like symptoms and light-headedness. A report by the Environmental Working Group suggests that nonstick coatings--such as Teflon, used to coat Tramontina pans--contain chemicals that possibly cause cancer.
On the Other: Safe under 500 degrees
Du Pont, the maker of Teflon, claims that pans are safe for use under 500 degrees. The Environmental Working Group and the Good Housekeeping Research Institute suggest cooking only on low or medium heat with nonstick pans such as Tramontina nonstick pans. GHRI experts found that lightweight, low-cost nonstick pans tended to get hotter faster and risk release of fumes.
Bottom Line
Tramontina nonstick pans are safe to use at cooking temperatures under 500 degrees. Temperatures of 500 degrees or higher will cause dangerous chemicals to release from the pan.
Source:
Good Housekeeping: Nonstick cookware fact and fiction
Environmental Working Group: Body Burden: PFOA, Teflon, Scotchgard
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