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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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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Even though there is no adaptation rules in Annex VIII, column 2 of REACH Regulation (EC n. 1907/2006), the hydrolysis is waived for Ca(H2PO2)2.

Hypophosphite ion has no hydrolysable group and therefore testing for hydrolysis is scientifically unjustified.

Calcium may react according to: Ca2+ + 2H2O -> Ca(OH)2 + 2H+

The study performed to analyse the dissociation constant demonstrates that the Calcium is stable as ion up to pH 12.6 and therefore any hydrolysis is unlikely.