Benzotriazoles and Benzothiazoles Group
These substances were identified for action under the Chemicals Management Plan (CMP). The screening assessment focuses on 15 substances referred to collectively under the CMP as the Benzotriazoles and Benzothiazoles Group. The substances in the benzothiazoles subgroup all contain the 2-mercaptobenzothiazole (MBT) moiety; therefore, the conclusion for this subgroup includes MBT and substances that are precursors to MBT, and is not limited to the 6 substances in the table below.
|Substance group||Subgroup||CAS RN||Common name or acronym||DSL name||Draft screening assessment||Risk management scope||Proposed conclusion on section 64 criteria||Follow-up activities|
|Benzotriazoles and Benzothiazoles Group||Benzotriazoles||95-14-7Footnote a||Benzotriazole||1H-Benzotriazole||HTML||none||Do not meet||None planned at this time.|
|3846-71-7Footnote a||UV-320||Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylethyl)-|
|29385-43-1Footnote b||Tolyltriazole||1H-Benzotriazole, 4(or 5)-methyl-|
|94270-86-7Footnote b||n/a||1H-Benzotriazole-1-methanamine, N,N-bis(2-ethylhexyl)-ar-methyl-|
|Benzothiazoles||95-31-8a||TBBS||2-Benzothiazolesulfenamide, N-(1,1-dimethylethyl)||HTML||Meet one or more of the criteria||Under consideration.
For MBT and its precursors, refer to risk management scope.
|95-33-0Footnote a||CBS||2-Benzothiazolesulfenamide, N-cyclohexyl-|
|120-78-5Footnote c||MBTS||Benzothiazole, 2,2'-dithiobis-|
|2492-26-4||SMBT||2(3H)-Benzothiazolethione, sodium salt|
|March 2024||Anticipated publication of the Final Screening Assessment for the Benzotriazoles and Benzothiazoles Group and the proposed Risk Management Approach for 2-Mercaptobenzothiazole (MBT) and its Precursors.|
|June 24, 2023||Publication in Canada Gazette, Part I, of a notice under section 71 of CEPA 1999.|
|March 6, 2021||Publication and start of 60-day public comment period on the Draft Screening Assessment for the Benzotriazoles and Benzothiazoles Group (including follow-up activities for TBBS, CBS, MBTS, MBT, SMBT, and DCBS) and the Risk Management Scope for 2-Mercaptobenzothiazole (MBT) and its Precursors. The related notice was published in the Canada Gazette, Part I: Vol. 155, No. 10.
Section 71 CMP 2023
In June 2023, a notice was published in the Canada Gazette, Part I: Vol. 157, No. 25 – June 24, 2023 under section 71 of CEPA 1999. This notice applies to 11 benzothiazole substances. More information is available on the Information gathering with respect to certain substances under the Chemicals Management Plan web page.
Two other substances were identified as being part of the Benzotriazoles and Benzothiazoles Group at the outset of the third phase of the CMP. These substances (CAS RNs 80584-90-3 and 21564-17-0) were subsequently determined to be of low concern to both human health and the environment through other approaches. The conclusion for CAS RN 80584-90-3 is provided in the Final 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. The conclusion for CAS RN 21564-17-0 is provided in the Final Screening Assessment for the Rapid Screening of Substances with Limited General Population Exposure.
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