WHMIS (Workplace Hazardous Materials Information System)

http://www.ccohs.ca/oshanswers/legisl/whmis_classifi.html

What are WHMIS classes or classifications?

WHMIS (Workplace Hazardous Materials Information System) uses classifications to group chemicals with similar properties or hazards. The Controlled Products Regulations specifies the criteria used to place materials within each classification. There are six (6) classes although several classes have divisions or subdivisions. Each class has a specific symbol to help people identify the hazard quickly. The classes are:

Class A - Compressed Gas

Class B - Flammable and Combustible Material

Division 1: Flammable Gas
Division 2: Flammable Liquid
Division 3: Combustible Liquid
Division 4: Flammable Solid
Division 5: Flammable Aerosol
Division 6: Reactive Flammable Material

Class C - Oxidizing Material

Class D - Poisonous and Infectious Material

Division 1: Materials causing immediate and serious toxic effects
Subdivision A: Very toxic material
Subdivision B: Toxic material

Division 2: Materials causing other toxic effects
Subdivision A: Very toxic material
Subdivision B: Toxic material

Division 3: Biohazardous Infection Material

Class E - Corrosive material

Class F - Dangerously reactive material