The category tells you about how hazardous the product is (that is, the severity of hazard). There are a few hazard classes with five or more categories (e.g., organic peroxides). Some hazard classes have only one category (e.g., corrosive to metals), others may have two categories (e.g., carcinogenicity (cancer)) or three categories (e.g., oxidizing liquids). Subcategories are identified with a number and a letter (e.g., 1A and 1B). In a few cases, sub-categories are also specified. Types are assigned an alphabetical letter (e.g., A, B, etc.). The hazard categories are assigned a number (e.g., 1, 2, etc.). Explosives are covered by other legislation in Canada.Įach hazard class contains at least one category. The WHMIS regulations do not currently include the Explosives hazard class. Note: GHS also defines an Explosive class and the Environmental Hazards group (not mandatory).
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