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The four-color diamond has red, blue, yellow and white quadrants that contain a code number (for the first three) or a code letter or symbol (in the white quadrant) corresponding to the different hazard types, fire, health, reactivity and specific. The numeric code ranges from 0 (the least dangerous) to 4 (the most dangerous). The white code has seven possible variants.
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Fire Hazard (RED)
0 - Will Not Burn 1 - Flash Point > 200 degrees F 2 - Flash Point < 200 degrees F 3 - Flash Point < 100 degrees F 4 - Flash Point < 73 degrees F |
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Health Hazard (BLUE)
0 - Normal Material 1 - Slightly Hazardous 2 - Hazardous 3 - Extreme Danger 4 - Deadly |
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Reactivity Hazard (YELLOW)
0 - Stable 1 - Unstable If Heated 2 - Violent Chemical Change 3 - Shock and Heat May Detonate 4 - May Detonate |
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Specific Hazard (WHITE)
Acid Alkali Corrosive Oxidizer Polymerization Radioactive Use No Water |
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