Prototype aircraft interior panels were installed as ceilings in a quarter-scale enclosure model lined with a non-flammable insulating material. Flashover con ditions were generated by a 52-kilowatt propane burner. The heat requirements for flashover, with an inert ceiling, agreed with those predicted by an NBS cor relation for full-scale room fires. The flammability of the prototype panels was experimentally found to be related to their ignition temperatures. In these tests, Nomex™ honeycomb panels with epoxy impregnated facesheets as well as those with phenolic impregnated Kevlar™, sustained ignition. The panels faced with phenolic impregnated fiberglass or graphite did not burn.
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