The Collaborative International Dictionary of English v.0.48:
nonexplosive \nonexplosive\ adj. Not explosive. [Narrower terms: noncombustible (vs. combustible), incombustible] WordNet 1.5]WordNet (r) 3.0 (2006):
nonexplosive adj 1: not explosive; "nonexplosive gases"; "a nonexplosive fuel" [ant: explosive]