Is DuraStone II Enamel which is used in DeLonghi toaster ovens safe?

Durastone II enamel is made of substances of clay particles of Teflon.

(DeLonghi Customer Service). Ovens made ​​from this material do not exceed 220 degrees (Celsius) and I think this says a lot about the dangers of Teflon (which at higher temperatures begins to be dangerous). However, this is just my deduction. See: http://en.wikipedia.org/wiki/Polytetrafluoroethylene (safety section)