Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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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EC number: 228-601-5 | CAS number: 6303-21-5
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
The freezing/melting point for phosphinic acid 60% has been determined according to method A1 requirements from regulation (CE) n°440/2008 and OECD guideline 102. During the freezing phase two peaks are observed and the main one has been selected (-63.0°C). During the melting phase only one peak was observed with a value of -35.2°C. As melting/ freezing temperature it is reasonable to take the average between both temperatures: -49.1 °C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -49.1 °C
Additional information
Four data are available for this endpoint. One key study obtained during a testing following recommended methodologies (Method A1 and OECD 102) and three values extracted from handbook and database for which no data on the methodology applied are available. These last references are considered as a reliable source according to the ECHA guidance R7a and are therefore used as supportive studies.
Key study result corresponds to the average of two peaks obtained for phosphinic acid 60% during the freezing phase of the test (peaks at -63°C and - 35.2°C) and is equal to - 49.1°C. Indeed, as this value comes from a test realized with the commercialized form of the acid (i.e aqueous solution of the phosphinic acid), it is retained as key value for the risk assessment.
It is supported by the Gestis database data: -25°C for phosphinic acid in solution.
On the other hand, the melting point as stated in the Gestis database, Merck Index and in the Handbook of Chemistry and Physics is 26.5°C for the solid form.
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