Module 2.1: Hazardous Classifications 

Physical Hazards: These are based on the physical and/or chemical properties of a product, such as flammability, reactivity, or corrosivity to metals.  

Examples of Physical Hazard Classes:

• Flammable gases, liquids, or solids

• Explosives

• Gases under pressure

• Oxidizing materials

• Self-reactive substances

• Pyrophoric (ignite spontaneously) materials

• Corrosive to metals

• Combustible dusts

• Reactive substances with water

Health Hazards: These are based on the ability of a product to cause a health effect, such as eye irritation, respiratory sensitization, or carcinogenicity 

Examples of Health Hazard Classes:

• Acute toxicity (can cause immediate harm if inhaled, swallowed, or absorbed)

• Skin corrosion or irritation

• Eye damage or irritation

• Respiratory or skin sensitization

• Germ cell mutagenicity (can cause genetic defects)

• Carcinogenicity (can cause cancer)

• Reproductive toxicity

• Specific target organ toxicity (single or repeated exposure)

• Aspiration hazard