fire-proof

/F AY1 ER0 P R UW0 F/
adjective
  1. 1

    Resistant to damage from fire.

    โ€œThe fireproof safe will protect documents inside for up to four hours in a standard house fire.โ€

Source: https://en.wiktionary.org/wiki/fire-proof, https://en.wiktionary.org/wiki/fireproof