§3.48 Susceptibility of materials to fire.

Where necessary for the purpose of determining compliance with any of the definitions in this section, the Administrator shall prescribe the heat conditions and testing procedures which any specific material or individual part must meet. (a) Fireproof. "Fireproof" material means a material which will withstand heat equally well or better than steel in dimensions appropriate for the purpose for which it is to be used. When applied to material and parts used to confine fires in designated fire zones "fireproof" means that the material or part will perform this function under the most severe conditions of fire and duration likely to occur in such zones. (b) Fire-resistant. When applied to sheet or structural members, "fire-resistant" material shall mean a material which will withstand heat equally well or better than aluminum alloy in dimensions appropriate for the purpose for which it is to be used. When applied to fluid-carrying lines, this term refers to a line and fitting assembly which will perform its intended protective functions under the heat and other conditions likely to occur at the particular location. (c) Flames-resistant. "Flame-resistant" material means material which will not support combustion to the point of propagating, beyond safe limits, a flame after removal of the ignition source. (d) Flash-resistant. "Flash-resistant" material means material which will not burn violently when ignited. nake further testing unduly hazardous. (e) Inflammable. "Inflammable" fluids or gases means those which will ignite readily or explode. SUBPART B—FLIGHT REQUIREMENTS GENERAL