CAS 321657-09-4 Moved to Domestic List

Summary#

The government issued Order 2025-87-10-02 Amending the Non-domestic Substances List, removing the substance identified by CAS number 321657-09-4 from the Non‑domestic Substances List. The order is dated October 23, 2025 and takes effect on the same day the corresponding Order 2025-87-10-01 Amending the Domestic Substances List comes into force.

What it does#

• Deletes CAS 321657-09-4 from Part I of the Non‑domestic Substances List.
• Notes that the removal follows the addition of that same substance to the Domestic Substances List (so the substance is now treated as present in Canada rather than only overseas).
• Says the change becomes effective when Order 2025-87-10-01 Amending the Domestic Substances List comes into force.

Who's affected#

• Businesses that make, import, sell or use the substance identified as 321657-09-4 in Canada.
• Laboratories, chemical suppliers and downstream users who track regulatory status of chemicals.
• Regulators and environmental groups monitoring chemical assessments.
• The Canada Gazette text does not give a common name or uses for the substance, so it is unclear which industries or products will notice this change.

Why it matters#

• Moving a substance from the Non‑domestic Substances List to the Domestic Substances List signals it is now considered present in Canada. Under the Canadian Environmental Protection Act, 1999, that can make the substance eligible for government review, testing requests, or risk-management actions — though this notice does not say any specific controls will follow.
• For companies, the change can mean new reporting or compliance steps if regulators decide to assess the substance. For the public, it could lead to future measures if health or environmental risks are identified.
• Because the Gazette entry only gives a CAS number and no common name or uses, it’s not possible from this notice alone to say what consumer products or workplaces might be affected.