Red=Flammability

4-Mateials with a flashpoint below
73 F and a boiling point above 100 F

3-Materials with a flashpoint below 73 F and a boiling point greater than or equal to 100 F or a flashpoint above 73 F and less than 100 F

2-Mateials with a flashpoint above 100 F, but not exceeding 200 F

1-Materials with a flashpoint above 200 F

0-Materials which normally won't burn

Yellow=Reactivity Hazard

4-Material is capable of explosion or detonation at normal temperature and pressure

3-Mateial is capable of explosion, but requires a strong initiating source, or the material reacts with water

2-Material undergoes violent chemical changes at elevated temperature and pressure

1-Normally stable, but can become unstable at elevated temperatures

0-Normally stable

Blue-Health Hazard

4-Materials with an oral LD50 of less than or equal to 5 mg/kg

3-Materials with an oral LD50 above 5, but less than 50 mg/kg

2-Materials with an oral LD50 above 50, but less than 500 mg/kg

1-Materials with an oral LD50 above 500, but less than 2000mg/kg

0-Materials with an oral LD50 above 2000mg/kg

White =Special Hazard

W Water Reactive


Ox Oxidizer


COR Corrosive




Radiation