Synonyms of 'incombustible'
Something that is fireproof cannot be damaged by fire.
soldiers wearing fireproof clothing
Flameproof cooking dishes can withstand direct heat, so they can be used, for example, on top of a cooker or stove, or under a grill.
Heat the oil in a flameproof casserole.
Thesaurus for incombustible from the Collins English Thesaurus
not capable of being burnt ; fireproof