The Collaborative International Dictionary of English v.0.48:

nonflammable \nonflammable\ adj.
   Not easily ignited, and burning only slowly if ignited.
   [Narrower terms: noncombustible (vs. combustible),
   incombustible] WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

nonexplosive \nonexplosive\ adj.
   Not explosive. [Narrower terms: noncombustible (vs.
   combustible), incombustible] WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

fire-resistant \fire-resistant\ fire-resisting \fire-resisting\
fire-resistive \fire-resistive\adj.
   Not able to burn or able to burn only with difficulty.
   [Narrower terms: noncombustible (vs. combustible),
   incombustible]

   Syn: fireproof.
        [WordNet 1.5]