Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Auto flammability

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Administrative data

Link to relevant study record(s)

auto-ignition temperature (liquids)
Data waiving:
other justification
Justification for data waiving:
the study does not need to be conducted because the substance is a liquid non flammable in air, e.g. no flash point up to 200°C

Description of key information

Methylphosphonic acid exists in white crystalline form at room temperature with a melting point of 105 °C at normal air pressure. The liquid form (>105 °C) could not be bringing to boil because decomposition occurs. A test to determine the flash point was carried out up to a temperature of 200 °C with the result that an exact flash point could not be determined (>200 °C). Therefore, in accordance with Regulation (EC) No. 1907/2006 Annex VII, a test for auto-flammability does not need to be conducted.

Key value for chemical safety assessment

Additional information