NFPA 704 Fire Diamond 4
NFPA 704 Fire Diamond 4 : Special Hazards (Bottom section of the diamond): There are only three NFPA 704 approved symbols as follows: "OX" Denotes an oxidizer, a chemical which can greatly increase the rate of combustion/fire. "SA" Denotes gases which are simple asphyxiants. The only gases for which this symbol is permitted are nitrogen, helium, neon, argon, krypton, and xenon. . The use of this hazard symbol is optional. "" Denotes unusual reactivity with water. This indicates a potential hazard using water to fight a fire involving this material. When a compound is both water-reactive and an oxidizer, the W/bar symbol should go in this quadrant and the OX warning is placed immediately below the NFPA diamond. Some organizations use other symbols, abbreviations, and words in the white Special Hazards section. NFPA 704 permits the use of additional symbols, but they must be placed outside of the NFPA diamond. The following symbols are not compliant with NFPA 704, but we present them here in case you see them on an MSDS or container label. "ACID" Indicates that the material is an acid, a corrosive material that has a pH lower than 7. 0. "ALK" Denotes an alkaline material, also called a base. These caustic materials have a pH greater than 7. 0. "COR" Denotes a material that is corrosive (it could be either an acid or a base). Thisis another symbol used for corrosive. The skull and crossbonesis used to denote a poison or highly toxic material. See also: CHIP Danger symbols. The international symbol for radioactivityis used to denote radioactive hazards; radioactive materials are extremely hazardous when inhaled. Thisindicates an explosive material. This symbol is somewhat redundant because explosives are easily recognized by their Instability Rating. The exact guidelines by which you can place a chemical in one of these four categories are available in the NFPA
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