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Template:NFPA 704 diamond/codes-overview

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Code descriptions ()
input type quarter code text
 
code H 0 Health 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g. sodium chloride
code H 1 Health 1: Exposure would cause irritation but only minor residual injury. E.g. turpentine
code H 2 Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform
code H 3 Health 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gas
code H 4 Health 4: Very short exposure could cause death or major residual injury. E.g. VX gas
code F 0 Flammability 0: Will not burn. E.g. water
code F 1 Flammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oil
code F 2 Flammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuel
code F 3 Flammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasoline
code F 4 Flammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propane
code I 0 Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen
code I 1 Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium
code I 2 Instability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorus
code I 3 Instability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxide
code I 4 Instability 4: Readily capable of detonation or explosive decomposition at normal temperatures and pressures. E.g. nitroglycerin
code S OX Special hazard OX: Oxidizer. E.g. potassium perchlorate
code S W, W, <s>W</s> Special hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid
code S W+OX, WOX Special hazard W+OX: Reacts with water in an unusual or dangerous manner AND is oxidizer
code S ACID Special hazard ACID: Acid
code S ALK Special hazard ALK: Alkaline
code S BIO Special hazard BIO: Biohazardous. E.g. smallpox virus
code S COR Special hazard COR: Corrosive; strong acid or base. E.g. sulfuric acid, potassium hydroxide
code S CRYO Special hazard CRYO: Cryogenic
code S POI Special hazard POI: Poisonous
code S RA Special hazard RA: Radioactive. E.g. plutonium
hyphen H - Health (blue): no hazard code
hyphen F - Flammability (red): no hazard code
hyphen I - Instability (yellow): no hazard code
hyphen S - Special hazards (white): no code
blank H <blank> Health (blue): no hazard code
blank F <blank> Flammability (red): no hazard code
blank I <blank> Instability (yellow): no hazard code
blank S <blank> Special hazards (white): no code
no letter
no letter 3
no letter 9
no letter WOX
unknown H xyz
unknown F xyz
unknown I xyz
unknown S xyz