Which classification includes liquids with flashpoint below 73°F and boil above 100°F?

Which classification includes liquids with flashpoint below 73°F and boil above 100°F?

• A. IB
• B. IA
• C. IC
• D. II

Answer: (A)

Understanding how flammable liquids are classified by flash point and boiling point helps explain why some liquids pose a fire hazard at room temperature but don’t boil away quickly. A flash point below 73°F means vapors can ignite in normal conditions. A boiling point at or above 100°F means the liquid won’t boil away at room temperature and needs heat to reach boiling. The combination of those two properties matches the Class IB designation, which identifies liquids that are highly flammable at ambient conditions but are not as volatile as liquids with lower boiling points. So liquids that have a flash point below 73°F and a boiling point above 100°F fall into Class IB.

Understanding how flammable liquids are classified by flash point and boiling point helps explain why some liquids pose a fire hazard at room temperature but don’t boil away quickly. A flash point below 73°F means vapors can ignite in normal conditions. A boiling point at or above 100°F means the liquid won’t boil away at room temperature and needs heat to reach boiling. The combination of those two properties matches the Class IB designation, which identifies liquids that are highly flammable at ambient conditions but are not as volatile as liquids with lower boiling points. So liquids that have a flash point below 73°F and a boiling point above 100°F fall into Class IB.