Answer: flameproof

AnswerCrossword Clue
FLAMEPROOFNot readily ignited
flameproofresistant to burning / to make resistant to damage or burning on contact with flame
flameproof(esp. of a fabric) Treated so as to be nonflammable
flameproof(of cookware) Able to be used either in an oven or on a stove