Which class corresponds to flammable and combustible liquids?

Which class corresponds to flammable and combustible liquids?

• A. Class 1 Explosives
• B. Class 3 Flammable and Combustible Liquids
• C. Class 2 Gases
• D. Class 9 Other Regulated Materials

Answer: (B)

Hazardous materials are grouped by the main danger they pose, with liquids classified by how easily they ignite. The key factor is the flash point—the temperature at which vapors can ignite in air. Flammable liquids have a flash point at or below 140°F, while combustible liquids have a flash point above 140°F but below about 200°F. Both are placed in Class 3: Flammable and Combustible Liquids. This aligns with common fuels like gasoline and kerosene, which ignite readily, as opposed to gases (Class 2), explosives (Class 1), or miscellaneous materials (Class 9). So the correct class for flammable and combustible liquids is Class 3.

Hazardous materials are grouped by the main danger they pose, with liquids classified by how easily they ignite. The key factor is the flash point—the temperature at which vapors can ignite in air. Flammable liquids have a flash point at or below 140°F, while combustible liquids have a flash point above 140°F but below about 200°F. Both are placed in Class 3: Flammable and Combustible Liquids. This aligns with common fuels like gasoline and kerosene, which ignite readily, as opposed to gases (Class 2), explosives (Class 1), or miscellaneous materials (Class 9). So the correct class for flammable and combustible liquids is Class 3.