Carboxylic Acid Anhydrides Group

These substances were identified for action under the Chemicals Management Plan (CMP).  This screening assessment focuses on 3 of 8 substances referred to collectively as the Carboxylic Acid Anhydrides Group.

Summary of publications
Substance group CAS RN Common name DSL name Public comments on the draft screening assessment Final screening assessment Conclusion on section 64 criteria Follow-up activities
Carboxylic Acid Anhydrides Group 85-44-9 Phthalic anhydride 1,3-Isobenzofurandione HTML HTML Does not meet None planned at this time
108-31-6 Maleic anhydride 2,5-Furandione
552-30-7 Trimellitic anhydride 5-Isobenzofurancarboxylicacid, 1,3-dihydro-1,3-dioxo-
Date Activity
March 9, 2019 Publication of the final screening assessment. The related notice was published in the Canada Gazette, Part I: Vol. 153, No. 10.
December 9, 2017 Publication and start of 60-day public comment period on the draft screening assessment. The related notice was published in the Canada Gazette, Part I: Vol. 151, No. 49.


Five other substances (CAS RNs 85-42-7, 26544-38-7, 28777-98-2, 32072-96-1and 68784-12-3) were identified as being part of the Carboxylic Acid Anhydrides 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 the 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.

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