Which class includes liquids with flashpoints at or above 100°F (37.8°C) and below 140°F (60°C)?

• A. Class I
• B. Class II
• C. Class IIIA
• D. Class IIIB

Answer: (B)

Understanding how flammable liquids are classified by flashpoint helps you see why this range fits Class II. The classifications separate liquids by the temperature at which their vapors can ignite. Class I is below 100°F (37.8°C), meaning the liquids ignite easily at relatively low temperatures. Class II covers liquids with flashpoints at or above 100°F (37.8°C) and below 140°F (60°C). Class IIIA is from 140°F up to 200°F (93°C), and Class IIIB is 200°F (93°C) and above. So a liquid that won’t flash until about 100°F up to just under 140°F sits squarely in Class II. This helps determine safe handling, storage, and ventilation requirements for that liquid.