In regards to WHMIS classifications, there are six classes (Compressed Gas, Flammable and Combustible Material, Oxidizing Material, Poisonous and Infectious Material, Corrosive Material and Dangerously Reactive Material). The Flammable and Combustible Material classification, or Class B, breaks down further into six subdivisions as follows:
Class B1 – Flammable Gases
Class B2 – Flammable Liquids
Class B3 – Combustible Liquids
Class B4 – Flammable Solids
Class B5 – Flammable Aerosols
Class B6 – Reactive Flammable Materials
The classification of a product under this section depends on the physical state of the product as well as the flammable properties of the chemical(s) contained in the product.
Flammable gases (B1) include any compressed gases that form a flammable mixture with air when in a concentration of 13 percent or a concentration range of 12 percent or greater by volume. Any product falling into the category of B1 must also be classified as a Class A Compressed Gas.
Flammable liquids (B2) are any liquids that have a flash point of less than 37.8°C (100°F).
Combustible liquids (B3) are any liquids that have a flash point of 37.8°C (100°F) or greater, but less than 93.3°C (200°F).
Flammable Solids (B4) include any solids that can be ignited readily, cause fires through friction or retained heat, and burn with a self-sustained flame.
Flammable Aerosols (B5) are any products in an aerosol container that give a flame projection at full valve opening, or a flashback at any degree of valve opening when tested.
Reactive Flammable Materials (B6) includes any substance that spontaneously combusts under normal conditions or in contact with air/water, or releases flammable gas if it contact with water.
Class B1 – Flammable Gases
Class B2 – Flammable Liquids
Class B3 – Combustible Liquids
Class B4 – Flammable Solids
Class B5 – Flammable Aerosols
Class B6 – Reactive Flammable Materials
The classification of a product under this section depends on the physical state of the product as well as the flammable properties of the chemical(s) contained in the product.
Flammable gases (B1) include any compressed gases that form a flammable mixture with air when in a concentration of 13 percent or a concentration range of 12 percent or greater by volume. Any product falling into the category of B1 must also be classified as a Class A Compressed Gas.
Flammable liquids (B2) are any liquids that have a flash point of less than 37.8°C (100°F).
Combustible liquids (B3) are any liquids that have a flash point of 37.8°C (100°F) or greater, but less than 93.3°C (200°F).
Flammable Solids (B4) include any solids that can be ignited readily, cause fires through friction or retained heat, and burn with a self-sustained flame.
Flammable Aerosols (B5) are any products in an aerosol container that give a flame projection at full valve opening, or a flashback at any degree of valve opening when tested.
Reactive Flammable Materials (B6) includes any substance that spontaneously combusts under normal conditions or in contact with air/water, or releases flammable gas if it contact with water.
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