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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Description of key information

No true melting point is observed for sodium hypophosphite. The substance decomposes at temperatures above 238°C and an apparent melting point due to water evaporation, is observed at 90°C. (OECD guideline 102)

Key value for chemical safety assessment

Additional information

An experimental study, which was performed according to OECD guideline 102 under ISO 17025, was selected as the key study (Reuse, 2009). Furthermore a complementary study was performed with TG-MS to identify the loss of elements during the heating. The thermograms thus obtained showed that in the test conditions, no true melting point was observed for this substance. Moreover the substance decomposed at temperatures above 238°C and an apparent melting point due to water evaporation was observed at 90°C.

This study is reliable without restrictions since it is a guideline study performed by an ISO 17025 certified laboratory.