Phenol, methylstyrenated

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

• Summary of publications
• Timelines
• Background

Summary of publications

CAS RN	DSL name	Public comments on the first draft screening assessment and the first risk management scope	Updated draft assessment	Revised risk management scope	Proposed conclusion on section 64 criteria	Follow-up activities
68512-30-1	Phenol, methylstyrenated	HTML	HTML	HTML	Meets one or more of the criteria	Refer to revised risk management scope

Timelines

Date	Activity
January 2027	Anticipated publication of the final assessment and proposed risk management approach.
January 17, 2026	Publication of the updated draft assessment and the revised risk management scope. The related notice was published in the Canada Gazette, Part I: Vol. 160, No. 3 – January 17, 2026.
November 6, 2021	Publication and start of 60-day public comment period on the draft screening assessment and risk management scope. The related notice was published in the Canada Gazette, Part I: Vol. 155, No. 45.

Background

Phenol, methylstyrenated (MSP) was first assessed in 2008 as a part of the Final Screening Assessment for Potentially Toxic Substances [145 Persistent Bioaccumulative and inherently Toxic (PBiT) substances] and was found not to meet any criteria set out in section 64 of the Canadian Environmental Protection Act, 1999 (CEPA). However, due to concerns regarding its hazardous properties and its potential for bioaccumulation and persistence in the environment, the Significant New Activity provisions of CEPA were applied. Since 2015, multiple Significant New Activity Notifications have been received, resulting in the establishment of ministerial conditions (Nos. 19668 and 19768) and the decision to conduct a further assessment for this substance.

In November 2021, the Government published a draft screening assessment and a risk management scope for MSP. The draft screening assessment proposed to conclude that that MSP was harmful to the environment but not to human health. The related notice was published in the Canada Gazette, Part I. Since then, the Strengthening Environmental Protection for a Healthier Canada Act came into force, and the draft assessment and risk management scope were updated to account for some of the amendments to CEPA. In the updated draft assessment, the Government is proposing that MSP is harmful to the environment but not to human health.