NFPA 704 Fire Diamond 1
NFPA 704 Fire Diamond 1 : Flammability Severity (Top section of the diamond): "4" Will rapidly or completely vaporize at normal pressure and temperature, or is readily dispersed in air and will burn readily. "3" Liquids and solids that can be ignited under almost all ambient conditions. "2" Must be moderately heated or exposed to relatively high temperature before ignition can occur. "1" Must be preheated before ignition can occur. "0" Materials that will not burn
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