Regulatory Updates on Trisiloxane and Terpene Substances in Canada

On January 25, 2025, the Government of Canada published regulatory updates in the Canada Gazette, Part I, Volume 159, Number 4, regarding the management of chemical substances, specifically addressing trisiloxane and a group of terpene and terpenoid substances.

Significant New Activity Notice for Trisiloxane

The Department of the Environment has issued a Significant New Activity (SNAc) Notice under the Canadian Environmental Protection Act, 1999 (CEPA) for trisiloxane, 3-ethyl-1,1,1,3,5,5,5-heptamethyl- (CAS RN 17861-60-8). This notice requires that any significant new activities involving this substance, particularly in cosmetic applications, require prior notification to the Minister of the Environment.

Key Restrictions

• Cosmetics Use Limits: The substance cannot be used in cosmetics beyond prescribed limits, such as 5% in hair dyes and 10% in rinse-off cosmetics.

• Advance Notification: New significant activities involving the substance must be notified 90 days in advance.

• Exemptions: Use of the substance in manufacturing for export only is exempt from these regulations.

These measures are intended to prevent potential environmental and health risks associated with excessive use of trisiloxane in consumer products.

Assessment of Terpene and Terpenoid Substances

The Department of the Environment and the Department of Health have conducted a draft assessment of 14 terpene and terpenoid substances and proposed 12 of them be added to Part 2 of Schedule 1 of CEPA due to health risks.

Key Findings

• Substances of concern include cade oil, verbena officinalis extract, ginkgo biloba extract, and sage oil.

• Potential health risks: Identified concerns include carcinogenicity, reproductive toxicity, and effects on the nervous system.

• Public consultation period: A 60-day public comment period is open from January 25, 2025, to March 26, 2025, during which stakeholders are invited to submit comments and scientific data to support further assessments.

These findings reinforce the Canadian Government’s commitment to consumer safety and regulatory oversight in the management of chemical substances.

For detailed information and to participate in the consultation process, stakeholders are encouraged to consult the official publications in the Canada Gazette here.