Which statement correctly describes Class IA liquids?

• A. Class IA liquids have a flashpoint below 73°F and a boiling point below 100°F
• B. Class IA liquids have a flashpoint above 100°F
• C. Class IA liquids have a boiling point above 200°F
• D. Class IA liquids have a flashpoint exactly at 73°F

Answer: (A)

Class IA liquids are defined by two specific temperature thresholds that indicate extreme flammability: the flashpoint must be below 73°F, and the boiling point must be below 100°F. A liquid meeting both criteria will readily form ignitable vapors at room temperature and can produce vapors easily as it warms, creating a high fire risk. That is why the correct description is that these liquids have a flashpoint under 73°F and a boiling point under 100°F. If the flashpoint is above 100°F, or the boiling point is not below 100°F (or the flashpoint is exactly at 73°F), the liquid does not fit Class IA.