Material, Noncombustible 3 : A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat
NFPA 430 Code for the Storage of Liquid and Solid Oxidizers, 2004 ed. http://www.nfpa.org/assets/files/aboutthecodes/430 /tia430-04-1.pdf, (Code: Storage of Liqd and Solid Oxidizers - Amer) {314 NFC}