<Tr> <Th> </Th> <Td> Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily (e.g. acetylene, propane, hydrogen gas). Includes pyrophoric substances . Flash point below room temperature at 22.8 ° C (73 ° F). </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Health (blue) </Th> </Tr> <Tr> <Th> 0 </Th> <Td> Poses no health hazard, no precautions necessary and would offer no hazard beyond that of ordinary combustible materials (e.g. wood, paper) </Td> </Tr> <Tr> <Th> </Th> <Td> Exposure would cause irritation with only minor residual injury (e.g. acetone, sodium bromate, potassium chloride) </Td> </Tr> <Tr> <Th> </Th> <Td> Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury (e.g. diethyl ether, ammonium phosphate, iodine) </Td> </Tr> <Tr> <Th> </Th> <Td> Short exposure could cause serious temporary or moderate residual injury (e.g. liquid hydrogen, carbon monoxide, calcium hypochlorite, hexafluorosilicic acid) </Td> </Tr> <Tr> <Th> </Th> <Td> Very short exposure could cause death or major residual injury (e.g. hydrogen cyanide, phosgene, methyl isocyanate, hydrofluoric acid) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Health (blue) </Th> </Tr> <Tr> <Th> 0 </Th> <Td> Poses no health hazard, no precautions necessary and would offer no hazard beyond that of ordinary combustible materials (e.g. wood, paper) </Td> </Tr>

Nfpa® 704 markings are designed for which of the following