Highly Toxic 5 : Under the U. S. OSHA HAZCOM Standard, there are specific criteria for materials which must be identified as toxic. The corresponding term under Canadian WHMIS is "Very Toxic" (criteria are not the same)
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Canadian Centre for Occupational Health and Safety CCOHS, Material Safety Data Sheet MSDS - An Explanation of Common Terms, Ontario, Canada 1988 (Revised 1996). http://ccinfoweb.ccohs.ca/help/msds/msdstermse.htm l, (Common MSDS Terms Used in Occupn Hlth and Sfty - Canad) {20}