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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Environmental fate & pathways


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Description of key information

HMDTMP acid and its salts are not hydrolytically unstable under ambient conditions.

Key value for chemical safety assessment

Additional information

The requirement to test the substance for hydrolysis was waived as the substance is not susceptible to hydrolytic degradation.

This is supported by read-across results for the related acid from dark and sterile controls, in which no degradation (as production of orthophosphate) was observed over a time period of 17 days under ambient conditions in water (Saeger, 1979,see IUCLID Section 5.1.3).

Nowack (2003) remarks that degradation of amine-containing phosphonates is negligible in metal ion-free oxygenated solutions; the presence of metal ions increases the rate of degradation to approximately 1% per day. The degradation is also negligible in the absence of dissolved oxygen indicating that redox reactions play a role.

Nowack, B. (2003). Review: Environmental chemistry of phosphonates. Water research (37), pp 2533-2546.