Canada Regulatory News

On 22 November 2025, the Government of Canada published the final screening assessment for two industrial chemicals known as the Decenes Group, as part of the third phase of the Chemicals Management Plan (CMP). This publication also includes a proposed risk management approach, which is now open for a 60-day public comment period following its notification in the Canada Gazette, Part I (Vol. 161, No. 47).

Two Substances Assessed

The Decenes Group includes:

• Hydrogenated didecene (CAS RN 68649-11-6)
• Hydrogenated trimer and tetramer of decene (HTTD) (CAS RN 68649-12-7)

Both substances are classified as materials of unknown or variable composition, complex reaction products, or biological materials (UVCBs).

Assessment Findings

The final screening assessment concludes that the substances meet one or more of the criteria under Section 64 of the Canadian Environmental Protection Act (CEPA). As a result, the government has proposed risk management actions, which stakeholders can review and comment on during the consultation period.

Background and Timeline

• January 9, 2021: The draft screening assessment and risk management scope were published for a 60-day public comment period (Canada Gazette Part I, Vol. 155, No. 2).
• June 24, 2023: A mandatory information-gathering notice under Section 71 of CEPA was published in the Canada Gazette (Part I, Vol. 157, No. 25) requesting data on both substances.
• November 22, 2025: The final assessment and proposed risk management approach released.
  

Further information, including reporting requirements associated with the Section 71 notice, is available on the Government of Canada's Chemicals Management Plan website here.