Amendments to Domestic Substances List

Summary#

This is Order 2025-66-07-01 Amending the Domestic Substances List: SOR/2025-177. It updates the Domestic Substances List by adding three substance entries, deleting three others from Part 3, and replacing one masked name; the Order was registered on August 29, 2025 under the Canadian Environmental Protection Act, 1999 and signed by Julie Dabrusin, Minister of the Environment.

What it does#

• Adds these entries to Part 1 of the Domestic Substances List:
  • 151944-98-8 T
  • 155419-49-1 T-P
  • 425387-19-5 N
• Removes these entries from Part 3 of the List:
  • 11671-7 T-P — (name shown in the Order: a type of siloxanes and silicones with polyalkylene glycol components)
  • 11676-3 T — (another siloxanes/silicones entry)
  • 14150-2 N — (a polymeric isocyanate-based substance)
• Replaces a masked entry in Part 3:
  • The masked identifier 19662-0 N-P is replaced by the chemical name shown in the Order: "2-Propenoic acid, carbomonocyclic ester, polymer with 4-ethenylphenyl acetate, alkyl 2,2-dimethylpropane derivative-initiated, hydrolyzed."
• Comes into force on the day it was registered: August 29, 2025.
• The Order itself does not explain the technical meaning of the codes like “T”, “T-P” or “N”; the source does not explain those labels.

Who's affected#

• Chemical manufacturers and importers who make, sell, or bring into Canada the specific substances listed.
• Downstream users and formulators who handle products containing those chemicals.
• Environmental and health regulators who track listed substances under the Canadian Environmental Protection Act, 1999.
• The public or communities near facilities that produce or use these chemicals may be affected indirectly if regulatory status changes.
• It is not clear from the Order which of these substances are widely used in Canadian commerce; further details may appear in the related regulatory analysis documents.

Why it matters#

• Being on or off the Domestic Substances List can change what reporting, assessment, or control measures apply to a chemical in Canada.
• Companies that make or import these substances may need to update their records and compliance actions.
• The change could affect whether a substance is targeted for risk assessment or regulatory actions by government.
• The Order itself does not give reasons for the specific changes; a Regulatory Impact Analysis Statement is referenced alongside related notices and may provide the rationale.