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1,1,1-Trichloroethane (here in referred to as Methyl chloroform) was used in high volumes as a solvent.

Methyl chloroform has an ozone-depleting potential (ODP); thus, it is identified as an ozone-depleting substance (ODS).

Canada is a Party to the Montreal Protocol on Substances that Deplete the Ozone Layer, which requires Parties to gradually phase-out production and consumption of ODS, as well as reduce and eliminate trade in these substances. Since January 1st, 1996, the manufacture, import and export of Methyl chloroform has been prohibited in Canada, except for use as feedstock, as analytical standards or for essential uses.

Protocol to the Vienna Convention on Substances that Deplete the Ozone Layer (Montreal Protocol)

CAS (Chemical Abstract Service) registry number: 71-55-6

Risk Assessment

Risk Management Tool(s)

Tool(s) developed to manage risks associated with the substance:

Other Information


Substances Management Information Line
Chemicals Management Plan
Gatineau, QC K1A 0H3
Telephone: 1-800-567-1999 (in Canada) or 819-938-3232
Fax: 819-938-3231

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