HMIS: Health Hazard Rating Chart
* Chronic Hazard - Chronic(long-term) health effects may result repeated overexposure.
0= Minimal Hazard - No significant risk to health
1= Slight Hazard - Irritation or minor reversible injury possible
2= Moderate Hazard - Temporary or minor injury may occur.
3= Serious Hazard - Major injury likely unless prompt action is taken and medical treatment is given.
4= Severe Hazard - Life-threatening, major or permanent damage may result from single or repeated overexposures.
HMIS: Flammability Hazard Rating Chart
0= Minimal Hazard - Materials that will not burn.
1= Slight Hazard - Materials that must be preheated before ignition will occur. Includes liquids,
solids and semi solids having a flash point above 200° F. (Class IIIB)
2= Moderate Hazard - Materials which must be moderately heated or exposed to high ambient
temperatures before ignition will occur. Includes liquids having a flash point at or above 100° F but below 200° F. (Classes II & IIIA)
3= Serious Hazard - Materials capable of ignition under almost all normal temperature conditions.
Includes flammable liquidswith flash points below 73° F and boiling points above 100° F.as well as liquids with flash points between 73° F and 100° F. (Classes IB & IC)
4= Severe Hazard - Flammable gases, or very volatile flammable liquids with flash points below
73° F, and boiling points below 100° F. Materials may ignite spontaneously with air. (Class IA)
HMIS: Physical Hazard Rating Chart
0= Minimal Hazard - Materials that are normally stable, under fire conditions and will not react to
water, polymerize, decompose, condense or self react.
1= Slight Hazard - Materials that are normally stable but can become unstable at high
temperature and pressures. Materials may react non-violently with water or undergo hazardous polymerization in the absence of inhibitors.
2= Moderate Hazard - Materials that are unstable and may undergo violent chemical change at
normal temperature and pressure with low risk for explosion. Materials may react violently with water or form peroxides upon exposure to air.
3= Serious Hazard - Materials that may form explosive mixtures with water are capable of
detonation or explosive reaction in the presence of a strong initiating source or undergo chemical change at normal temperature and pressure with moderate risk of explosion.
4= Severe Hazard - Materials that are readily, capable of water reaction, detonation or explosive
decomposition at normal temperatures and pressures.
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