noncombustible

from WordNet (r) 3.0 (2006)

noncombustible
    adj 1: not capable of igniting and burning [syn:
           {noncombustible}, {incombustible}] [ant: {combustible}]

from The Collaborative International Dictionary of English v.0.48

noncombustible \noncombustible\ adj.
   Not combustible; not able to burn; as, drapery should be made
   of noncombustible materials. Opposite of {combustible}.

   Syn: incombustible.
        [WordNet 1.5]