The terms "fireproof safe", "fire-safe" and "fire-resistant safe" are widely used, but no safe is completely fireproof. A certified fire-resistant safe is tested at temperatures of 800°C and above, and offers a guaranteed protection time that is sufficient in practice to survive a domestic fire.
What does exist is a certified fire-resistant safe that protects its contents for a defined period, or a fire-resistant cabinet offering fire protection only. Only certified models offer proven protection.
More about fire resistance standards: fire resistance classes and test methods.