Organic Peroxides Group

These substances were identified for action under the Chemicals Management Plan (CMP). This screening assessment focuses on 2 of 6 substances referred to collectively as the Organic Peroxides Group.

Information sheet

Summary of publications
Substance group CAS RN Common name DSL name Final screening assessment Conclusion on section 64 criteria Follow-up activities
Organic Peroxides Group 80-15-9 Cumene hydroperoxide (CHP) Hydroperoxide, 1-methyl-1-phenylethyl HTML Does not meet None planned at this time
80-43-3 Dicumyl peroxide (DCUP) Peroxide, bis(1-methyl-1-phenylethyl) Information gathering

Follow-up activities

While exposure of the general population to DCUP is not of concern at current levels, this substance is considered to have a health effect of concern due to its potential reproductive effects. Therefore, there may be a concern for human health if exposures were to increase. For this reason, the Government will carry-out follow-up activities to track changes in exposure, and review toxicity data and other relevant information pertaining to DCUP that may become available. The Government will use the data gathered through these follow-up activities to prioritize further information gathering or risk assessment work, as required.

Date Activity
June 22, 2019 Publication of the final screening assessment. The related notice was published in the Canada Gazette, Part I: Vol. 153, No. 25.
April 28, 2018 Publication and start of 60-day public comment period on the draft screening assessment (including follow-up activities for DCUP). The related notice was published in the Canada Gazette, Part I: Vol. 152, No. 17.


Four other substances, CAS RNs 133-14-2, 614-45-9, 3006-86-8, and 3851-87-4, were identified as being part of the Organic Peroxides Group at the outset of the third phase of the CMP. These substances were subsequently determined to be of low concern to both human health and the environment, through other approaches. Conclusions for these 4 substances are provided in the Screening Assessment for Substances Identified as Being of Low Concern using the Ecological Risk Classification of Organic Substances and the Threshold of Toxicological Concern (TTC)-based Approach for Certain Substances.

Page details

Date modified: