Noncombustible 11 : Any material that, in the form in which it is used and under the conditions anticipated, will not ignite and burn nor will add appreciable heat to an ambient fire
NFPA 1141 Standard for Fire Protection in Planned Building Groups, 2003 ed. http://www.nfpa.org/assets/files/AboutTheCodes/114 1/1141-A2003-rop.PDF, (Std: Fr Prac in Plan Build Groups - Amer) {382 NFC}