WHMIS Class D - Division 1: Materials Causing Immediate and Serious Toxic Effects, Subdivision A: Very Toxic Material

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WHMIS - Class D - Division 1: Materials Causing Immediate and Serious Toxic Effects, Subdivision A (Sections 46-48)

The legal text of the regulations in sections 46-48 follows below:


CPR: Section 46: Pure Substances and Tested Mixtures - Acute Lethality

A pure substance or tested mixture falls into Subdivision A of Division 1 of Class D — Poisonous and Infectious Material if, in an animal assay for acute lethality, it has an


(a) LD50 not exceeding 50 milligrams per kilogram of body weight of the animal when tested in accordance with OECD Test Guideline No. 401, “Acute Oral Toxicity”, dated May 12, 1981;


(b) LD50 not exceeding 200 milligrams per kilogram of body weight of the animal when tested in accordance with OECD Test Guideline No. 402, “Acute Dermal Toxicity”, dated May 12, 1981;


(c) 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;


(d) LC50 not exceeding 1,500 parts per million by volume of vapour when tested for four 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 greater than two times the value of that LC50; or


(e) LC50 not exceeding 0.5 milligrams per litre or 500 milligrams per cubic metre of dust, mist or fume when tested for four hours in accordance with OECD Test Guideline No. 403, “Acute Inhalation Toxicity”, dated May 12, 1981.


CPR: Section 47: Poisonous Substances as Defined by the Transportation of Dangerous Goods Regulations

A pure substance or tested mixture falls into Subdivision A of Division 1 of Class D — Poisonous and Infectious Material if it is included in Division 3 of Class 2 or in Packing Group I or II of Division 1 of Class 6 in Part III of the Transportation of Dangerous Goods Regulations.


CPR: Section 48: Untested Mixtures

An untested mixture falls into Subdivision A of Division 1 of Class D — Poisonous and Infectious Material if it contains a product, material or substance that meets any of the criteria applicable to a pure substance or tested mixture referred to in section 46 or 47 and is present at a concentration of one per cent or more.


WHMIS MSDS Reference Manual - Sections 46-48

Health Canada's WHMIS MSDS reference manual for sections 46-48 is available at: WHMIS Requirements of the HPA and CPR, CPR Sections 46-48. One of the important points they note is as follows:


"The criteria set out in paragraphs 46(d) and 49(c) include specified values of the ratio between the "saturated vapour concentration" (maximum concentration of the vapour in air) and the LC50 (lethal concentration in air). This ratio indicates the potential inhalation hazard of volatile substances which may be spilled in a confined space. A consequence of the formula is that highly volatile liquids such as ethyl formate or 1,1,2-trichloro-1,2,2-trifluoroethane are classified as "A Very Toxic Material" because of their high saturation vapour concentrations even though their high LC50s would normally suggest a relatively low toxicity. "


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:


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