Based on DuPont's recommendation, the safe temperature of Teflon coated
cookware is 500°F (260°C).
Ref: http://www.teflon.com/NASApp/Teflon/TeflonPageServlet?pageId=/consumer/na/eng/
housewares/cookware/cookware/nonStick/cookwareCare/cookware_care.html
Cookware Care
Here you'll find your answers to frequently asked questions about cooking
with and cleaning a DuPont non-stick surface.
1. What's the best way to clean my Teflon® surface?
2. Can I use an abrasive cleaner or scouring pad?