1) Fire-resistant 2) Fire-resisting 3) Fire-resistive 4) Fire-retardant 5) Fireproof 6) Flame-retardant 7) Flameproof 8) Incombustible 9) Nonflammable 10) Not flammable 1) Fireproof 2) Flameproof 3) Incombustible 4) Nonflammable 
A material which will not ignite, burn or support combustion when subjected to heat or fire.
Any material that will neither ignite nor actively support combustion in air at a temperature of 1.200
[adj] - not capable of igniting and burning
incombustible adjective not capable of igniting and burning
not flammable.