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5 Cards in this Set
- Front
- Back
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History and purpose |
In 1961 NFPA adopted the 704 placarding system to safeguard the lives of firefighters when responding to emergencies at facilities that manufacture, store or use Hazordous Materials. This system gives responders an idea of what hazards the chemicals may pose in 3 categories: flammability, health, instability. It Gives a rating of 0-4 with 0 being least hazard and 4 being the most hazardous. There is a fourth category which shows symbols of any unusual or misc. hazards. This system does not aide in chemical identification. |
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Red |
4-Materials that rapidly or completely vaporize at atmospheric pressure and normal ambient temp
3- liquids and solids that can be ignited under almost all ambient temperature conditions
2- materials that must be moderately heated or exposed to high ambient temps before ignition can occur
1- materials that must be preheated before ignition can occur
0- materials that will not burn under typical fire conditions |
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Blue |
4- Materials that, under emergency conditions, can be lethal
3- materials that, under emergency conditions, can cause serious or permanent injury
2- materials that, under emergency conditions, can cause temporary incapacitation or residual injury
1- materials that, under emergency conditions, can cause significant irritation
0- materials that, under emergency conditions, would offer no hazard beyond ordinary combustibles |
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Yellow |
Instability 4- materials that are readily capable of detonation or explosive decomposition or reaction @ normal temps and pressures
3- Mat. Which are capable of detonation or explosive decomposition but that require a strong initiating source or must be heated under confinement before initiation
2- mat. that readily undergo violent chemical change at elevated temps and pressures.
1- mat. which are normally stable but can become unstable at elevated temps and pressures
0- materials that which themselves are normally stable, even under fire conditions |
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White |
Misc Hazards POL- polymerization Hazard
COR- corrosive hazard
W/- materials that react violently or explosively with water
OX- oxidizer
Trefoil- Radiation Hazard
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