Short-chain Alkanes

This substance was identified for action under the Chemicals Management Plan (CMP).

Draft Screening Assessment
Substance Group CAS RN Common Name DSL Name Draft Screening Assessment Proposed Conclusion on Section 64 criteria Follow-up Activities
Short-chain alkanes 74-84-0 Ethane Ethane HTML Does not meet None planned at this time
74-98-6 Propane Propane
75-28-5 Isobutane, in the absence of 1,3-butadiene Propane, 2-methyl
106-97-8 Butane, in the absence of 1,3-butadiene Butane
68513-65-5 Butane, branched and linear Butane, branched and linear
Date Activity
December 2017 Anticipated release of the final screening assessment in Canada Gazette.
January 28, 2017 Publication and start of 60-day public comment period on the draft screening assessment. The related Notice was published in the Canada Gazette, Part I: Vol. 151, No. 4.


The substance 1,3-butadiene was assessed by the Government of Canada in 2000 and was found to be harmful to human health and to the environment.  It was added to the List of Toxic Substances in Schedule 1 of the Canadian Environmental Protection Act, 1999 (CEPA 1999), and is currently subject to ongoing risk management activities.

The substances isobutane containing 1,3-butadiene and butane containing 1,3-butadiene were assessed under the Challenge initiative under the Chemicals Management Plan in 2009. The screening assessment concluded that exposure to 1,3-butadiene from the uses of butane and isobutane should be considered in relation to ongoing risk management activities. It also specified that a screening assessment of isobutane and butane, in the absence of 1,3-butadiene, would be conducted at a later time.

This screening assessment for short-chain alkanes fulfils the commitment to assess the substances isobutane and butane, in the absence of 1,3-butadiene.

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