nonflammable

This term is primarily used in technical, industrial, and safety contexts to describe materials that resist ignition. It carries a clinical, objective tone, often appearing on product labels, building codes, and safety certifications to indicate a specific physical property rather than a general quality.

While often used interchangeably with fireproof, nonflammable specifically denotes a material that will not sustain combustion. In contrast, fireproof suggests a more absolute resistance to any damage from fire, including melting or warping, making nonflammable the more precise choice for chemical or textile descriptions.