Appendix A: workplace hazardous materials information system

CLASS A: COMPRESSED GAS

This class includes compressed gases, dissolved gases, and gases liquified by compression or refrigeration.

CLASS B: FLAMMABLE AND COMBUSTIBLE MATERIAL

This class includes solids, liquids, and gases capable of catching fire in the presence of a spark or open flame under normal working conditions.

CLASS C: OXIDIZING MATERIAL

These materials increase the risk of fire if they come in contact with flammable or combustible materials.

CLASS D: POISONOUS AND INFECTIOUS MATERIAL

Division 1:

• Materials Causing Immediate and Serious Toxic Effects: These materials can cause death or immediate injury when a person is exposed to small amounts. Examples: sodium cyanide, hydrogen sulphide.

Division 2:

• Materials Causing Other Toxic Effect: These materials can cause life-threatening and serious long-term health problems as well as less severe but immediate reactions in a person who is repeatedly exposed to small amounts.

Division 3:

• Biohazardous Infectious MATERIAL: These materials contain an organism that has been shown to cause disease or to be a probable cause of disease in persons or animals.

CLASS E: CORROSIVE MATERIAL

This class includes caustic and acid materials that can destroy the skin or eat through metals. Examples: sodium hydroxide, hydrochloric acid, nitric acid.

CLASS F: DANGEROUSLY REACTIVE MATERIAL

These products may self-react dangerously (for example, they may explode) upon standing or when exposed to physical shock or to increased pressure or temperature, or they emit toxic gases when exposed to water.