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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Vapour pressure

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Administrative data

Link to relevant study record(s)

Description of key information

about 0.1 bar at 300°C and about 1bar at about 400°C

Key value for chemical safety assessment

Additional information

The vapour pressure of the red phosphorus depends form the molecular structure of the red phosphorus and is caused by the decomposition into gaseous white phosphorus, consisting of P4 molecules.

At room temperature red phosphorus is stable without any measurable vapour pressure. In the calculation for the CSA a hypothetical value <0.001Pa is used.