1) Fire-resistant 2) Fire-retardant 3) Flame-resistant 4) Flame-retardant 5) Flameproof 6) Impervious to damage by fire 7) Incombustible 8) Like some vaults 9) Make resistant to fire 10) Noncombustible 11) Safe from blazes Found on https://www.crosswordclues.com/clue/fireproof