Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The test item is not considered to be hydrolytically stable at pH 4, 7 and 9.

Additional information

The hydrolysis of Irgamet 39 as a function of pH was determined at three different pH-values by the method OECD 111 (BASF, draft report, 2022). At each pH hydrolytical decomposition can be observed, e.g. at a pH of 7 with the rate konstant k at 20 C° of 0.00591 1/h and a DT50 of 117.3 h, and at 25 C° of 0.00852 1/h and a DT50 of 81.4 h. The final hydrolysis product could be identified as Irgamet TTZ (Methyl-1H-benzotriazole).


Based on a previous tier 1 study, the test item is not considered to be hydrolytically stable at pH 4, 7 and 9. Methyl-1H-benzotriazole was detected as hydrolysis product. Additionally the following transformation products were proposed: Formaldehyde (CAS No. 50-00-0), Diethylhexylamine (CAS No. 106-20-7).