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The Occupational Health and Safety Act includes O.Reg. 490/09 Designated Substances.  Employers are required to assess the likelihood of exposure to a designated substance.  Designated substances are:

Acrylonitrile Isocyanates
Aresenic Lead
Asbestos Mercury
Benzene Silica
Coke oven emissions Vinyl choride
Ethylene oxide

If these substances are in use, employers are required to carry out an assessment in consultation with the Joint Health and Safety Committee and document findings. Further to this, a control program is required where the employer shall develop, put into effect and maintain measures and procedures to control the worker's exposure to the designated substances.

Should you have need to work with any of these substances a permit application must be completed using the link below:

Use of Designated Substance Permit Application