Aliphatic Diesters Group
Information sheet
These substances were identified for action under the Chemicals Management Plan (CMP). The screening assessment focused on 1 of 2 substances referred to collectively under the CMP as the Aliphatic Diesters Group.
| 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 |
|---|---|---|---|---|---|---|---|
| Aliphatic Diesters Group | 27178-16-1 | Diisodecyl adipate (DIDA) | Hexanedioic acid, diisodecyl ester | HTML | HTML | Does not meet | Significant New Activity (SNAc) provisions |
| Date | Activity |
|---|---|
| October 25, 2025 | Publication in the Canada Gazette, Part I: Vol. 159, No. 43 of an updated notice of intent to amend the DSL to apply the SNAc provisions of the Canadian Environmental Protection Act, 1999 (CEPA) and start of a 60-day public comment period. |
| February 9, 2019 | Publication in the Canada Gazette, Part I: Vol. 153, No. 6 of a notice of intent to amend the DSL to apply the SNAc provisions of CEPA and start of a 60-day public comment period. |
| February 9, 2019 | Publication of the final screening assessment. The related notice was published in the Canada Gazette, Part I: Vol. 153, No. 6. |
| December 2, 2017 | Publication and start of 60-day public comment period on the draft screening assessment (including follow-up activities). The related notice was published in the Canada Gazette, Part I: Vol. 151, No. 48. |
Follow-up activities
Although DIDA is not considered to be harmful to human health or the environment at current levels of exposure, this substance is associated with effects of concern, namely its potential to cause developmental toxicity. Therefore, there may be a concern if exposures were to increase. For this reason, the proposed follow-up activity is to apply the SNAc provisions CEPA to DIDA.
In February 2019, a notice of intent to apply the SNAc provisions of CEPA to DIDA was published. During the 60-day public comment period, the Government was informed of uses for this substance which were evaluated and deemed to be acceptable.
Consequently, the scope of the SNAc requirements was amended and an updated notice of intent to apply SNAc provisions of CEPA to DIDA was published.
Background
One other substance, nonanedioic acid, bis(2-ethylhexyl) ester (CAS RN 103-24-2), was identified as being part of the Aliphatic Diesters Group at the outset of the third phase of the CMP. This substance was subsequently determined to be of low concern to both human health and the environment through another approach. The conclusion for this substance 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.