NFPA 704
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NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response is a standard maintained by the U.S.-based National Fire Protection Association. First tentatively a
NFPA 704 placard of hydrofluosilicic acid. Notably, it is using the nonstandard COR sign.
Sarin
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Sarin is an extremely toxic organophosphorus compound that has been often used as a chemical weapon due to its extreme potency as a nerve agent.
NFPA 704
…exposure could cause death or major residual injury (e.g. aluminum phosphide, hydrogen cyanide, phosgene, diborane, methyl isocyanate, hydrofluoric acid, sarin, mustard gas, tert-butyllithium) Instability–reactivity (yellow) 0 Normally stable, even under fire exposure conditions, and is not reactive with water…
Rabbit used to check for leaks at former sarin production plant (Rocky Mountain Arsenal), 1970
U.S. Honest John missile warhead cutaway, showing M134 Sarin bomblets (c. 1960)