Thiols Group

Information sheet

These substances were identified for action under the Chemicals Management Plan (CMP). This screening assessment focuses on 4 of 6 substances referred to collectively as the Thiols Group.

Summary of publications
Substance group CAS RN Common name DSL name Final screening assessment Conclusion on section 64 criteria Follow-up activities
Thiols Group 75-18-3 Dimethyl sulfide Thiobis-methane HTML Does not meet None planned at this time
150-60-7 Benzyl disulfide Bis(phenylmethyl) disulfide
25103-58-6 tert-Dodecyl mercaptan tert-Dodecanethiol
71159-90-5 Grapefruit mercaptan  alpha, alpha, 4-Trimethyl-3-cyclohexene-1-methanethiol 
Date Activity
October 20, 2018 Publication of the final screening assessment. The related notice was published in the Canada Gazette, Part I: Vol. 152, No. 42.
July 22, 2017 Publication and start of 60-day public comment period on the draft screening assessment (including follow-up activities for tert-dodecyl mercaptan and grapefruit mercaptan). The related notice was published in the Canada Gazette, Part I: Vol. 151, No. 29.


Two other substances (CAS RNs 60-24-2 and 73984-93-7) were identified as being a part of the Thiols 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 2 substances are provided in the Screening Assessment for Substances Identified as Being of Low Concern based on the Ecological Risk Classification of Organic Substances and the Threshold of Toxicological Concern (TTC)-based Approach for Certain Substances.

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