A liquid with a flashpoint of 210°F is classified as which class?

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

Answer: (C)

Flammable-liquid classifications are based on the flashpoint—the lowest temperature at which enough vapor is produced to ignite in air. In this system, Class III liquids are subdivided: Class IIIA covers flashpoints from 140°F up to 199°F, and Class IIIB covers flashpoints at 200°F and above. A liquid with a flashpoint of 210°F therefore falls into Class IIIB, since it meets and exceeds the 200°F threshold.

This matters because higher flashpoints indicate the liquid is less likely to ignite at lower temperatures, but still requires proper handling, storage, and labeling as a Class IIIB flammable. Note that some classifications use a Class IIIC in different schemes, but within this standard framework the 200°F and above range is IIIB.