Flammable Liquids
Defined as liquids having closed cup flash points below 100°F (37°C) and vapor pressures not exceeding 40 psi (276 kPa) (2.76 bar) at 100°F (37°C). Flammable liquids are referred to as Class 1 liquids.
1. Class IA liquids – flash points below 73°F (22.8°C) and boiling points below 100°F (37.8°C).
2. Class IB liquids – flash points below 73°F (22.8°C) and boiling points at or above 100°F (37.8°C).
3. Class IC liquids – flash points at or above 73°F (22.8°C) and below 100°F (37.8°C).
Combustible Liquids
Defined as liquids having closed cup flash points at or above 100°F (37°C). Combustible liquids are referred to as Class II or Class III liquids.
1. Class II liquids – flash points at or above 100°F (37.8°C) and below 140°F (60°C).
2. Class IIIA liquids – flash points at or above 140°F (60°C) and below 200°F (93.4°C). c.
3. Class IIIB liquids – flash points at or above 200°F (93.4°C).