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Designated substances

Designated substances are materials that, due to risks associated with exposure, handling or storage, are strictly regulated by the Ministry of Labour (MOL).

Individuals working with designated substances are required to comply with the the Designated Substances Regulations (O. Reg 490). If you work or plan to work with these materials, an assessment of the exposure or likelihood of exposure to a designated substance in the workplace must be conducted. Contact the Safety Office (ext. 33587) to request assistance in working with any designated substance.

The materials that have been rated as designated substances are:

  • Acrylonitrile
  • Arsenic
  • Asbestos
  • Benzene
  • Coke oven emissions
  • Ethylene oxide
  • Isocyanates
  • Lead
  • Mercury
  • Silica
  • Vinyl chloride

In some cases, uWaterloo has developed safety programs pertaining to a particular designated substance. These programs are located on left hand menu.