A liquid with a flashpoint of 155°F is classified as which class?

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

Answer: (B)

A liquid’s classification by flashpoint uses ranges to group flammable liquids by how easily their vapors can ignite. The flashpoint is the lowest temperature at which the liquid’s vapors can ignite in air. In this system, liquids that flash at 140°F up to 200°F are placed in Class IIIA, while higher flashpoints move into Class IIIB and lower ones into Class II or I. Since 155°F falls between 140°F and 200°F, it fits into the Class IIIA category. This classification helps determine appropriate handling and storage practices, since higher flashpoints generally mean a lower fire hazard under normal conditions.