Wiktionary
n. A chemical used to impart flame resistance.
Wikipedia
The term Flame retardants subsumes a diverse group of chemicals which are added to manufactured materials, such as plastics and textiles, and surface finishes and coatings. Flame retardants inhibit or delay the spread of fire by suppressing the chemical reactions in the flame or by the formation of a protective layer on the surface of a material. They may be mixed with the base material (additive flame retardants) or chemically bonded to it (reactive flame retardants). Mineral flame retardants are typically additive while organohalogen and organophosphorus compounds can be either reactive or additive.
Usage examples of "flame retardant".
This entire chamber is going to be filled with flame retardant foam.
The plaid jacket the fellow had been wearing was flame retardant, the same jacket worn by bush pilots throughout the region.