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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Boiling point

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Administrative data

Link to relevant study record(s)

Description of key information

- 258 degrees Celsius

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
258 °C

Additional information

In a key study, the boiling point of the test item Phosphonic acid (Phosphorous acid Flake)was determined based on the procedures indicated by the following internationally accepted methods:

- OECD Guideline 103

- EU Method A.2

- EPA OPPTS 830.7220

A clear boiling point, as defined in the guideline with a current stream of bubbles evolving from the capillary, was observed at a heating temperature of 258 °C (531 K).