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Reference Manual for the WHMIS Requirements of the Hazardous Products Act and Controlled Products Regulations

CPR Section 3 - Concentration Expressed as a Percentage

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Concentration Expressed as a Percentage

3. Where in these Regulations, other than in sections 11 and 36, the concentration of an ingredient is expressed as a percentage, the percentage shall be taken as an expression of the ratio of the weight of the ingredient to the weight of the controlled product.

Interpretation / Discussion of Section 3

This section of the CPR establishes that, with the noted exceptions, concentrations expressed throughout the CPR are ratios of weight to weight only, i.e., not weight to volume, volume to volume, etc ...