Reg 490 B 2025

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A designated substance is defined in the Occupational Health and Safety Act as a biological, chemical or physical agent or combination of thereof prescribed as a designated substance to which the exposure of a worker is prohibited, regulated, limited or controlled.
The DSR covers asbestos as the most famous (infamous?) hazardous product BUT there are 11 designated substances in total.
Under Ontario Regulation 490/09, there are 11 designated substances. In alphabetical order, these are acrylonitrile, arsenic, asbestos, benzene, coke oven emissions, ethylene oxide, isocyanates, lead, mercury, silica, and vinyl chloride.
490/09 prescribes 11 chemical agents as designated substances under OHSA . They are: acrylonitrile, arsenic, asbestos, benzene, coke oven emissions, ethylene oxide, isocyanates, lead, mercury, silica and vinyl chloride.
(1)(A) Any substance or mixture of substances which (i) is toxic, (ii) is corrosive, (iii) is an irritant, (iv) is a strong sensitizer, (v) is flammable or combustible, or (vi) generates pressure through decomposition, heat, or other means, if such substance or mixture of substances may cause substantial personal
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we perform Designated Substance Surveys (DSS) / Designated Substance Reports (DSR). A DSS Report is a Hazardous Material Assessment of your home / office / property that is required by the MOL prior to any demolition / renovation.
O. Reg. 490/09 prescribes 11 chemical agents as designated substances under OHSA . They are: acrylonitrile, arsenic, asbestos, benzene, coke oven emissions, ethylene oxide, isocyanates, lead, mercury, silica and vinyl chloride.

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