WHMIS Class F - Dangerously Reactive Material

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WHMIS - Controlled Products Regulations: Class F - Dangerously Reactive Material (Section 66)

The legal text of the regulations in section 66 follows below:


CPR: Section 66: Class F - Dangerously Reactive Material

A product, material or substance shall be included in Class F — Dangerously Reactive Material listed in Schedule II to the Act if it


  • (a) undergoes vigorous polymerization, decomposition or condensation;


  • (b) becomes self-reactive under conditions of shock or increase in pressure or temperature; or


  • (c) reacts vigorously with water to release a gas that has an LC50 not exceeding 2,500 parts per million by volume of gas, when tested for four hours in accordance with OECD Test Guideline No. 403, “Acute Inhalation Toxicity”, dated May 12, 1981.


WHMIS MSDS Reference Manual - Section 66

Health Canada's WHMIS MSDS reference manual for section 66 is available at: WHMIS Requirements of the HPA and CPR, CPR Section 66. One of the important points they note is as follows:


"Section 66 covers a wide range of chemically reactive materials, including self-reactive materials and substances which react with water to form a toxic gas as described by paragraph 46(c) of the CPR. At present, section 66 correlates only with paragraph 46(c); i.e., paragraph 66(c) refers only to emissions of a "gas" in contact with water or water vapour. This implies the exclusion of flammable vapours and vapours with an LC50 not exceeding 1,500 ppm as per paragraph 46(d) and vapours with an LC50 between 1,500 and 2,500 ppm as per paragraph 49(c) of the CPR. Therefore, it has been agreed that section 66 of the CPR be amended to include the following two paragraphs:"


"(d) reacts vigorously with water to release a vapour that has an LC50 not exceeding 1,500 ppm by volume of vapour, when tested for four hours in accordance with OECD Test Guideline 403, "Acute Inhalation Toxicity", dated May 12, 1981, and a saturated vapour concentration at normal atmospheric pressure greater than two times the value of that LC50"; or


"(e) reacts vigorously with water to release a vapour that has an LC50 of more than 1,500 but not exceeding 2,500 ppm by volume of vapour, when tested for 4 hours in accordance with OECD Test Guideline No. 403, "Acute Inhalation Toxicity", dated May 12, 1981, and a saturated vapour concentration at normal atmospheric pressure of more than 0.4 times the LC50"; {ref.: PIS No. 67}."


Nexreg Compliance WHMIS Canadian MSDS Authoring Services

Nexreg Compliance can author a WHMIS compliant Canadian MSDS for your product. For more information on Nexreg's WHMIS MSDS authoring services, please contact Nexreg Compliance or visit the following links:


Canadian Goverment Links


WHMIS MSDS NexregWiki Links


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