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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

Vapour pressure

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vapour pressure
Type of information:
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
See attached QMRF/QPRF
Principles of method if other than guideline:
The result was obtained using a valid read cross from its parent acid.
Key result
Test no.:
25 °C
Vapour pressure:
< 0 hPa

< 1.65 x 10E-8 Pa

A vapour pressure value of <1.65E-08 Pa was obtained using an accepted calculation method. The result is considered to be reliable.

Description of key information

Vapour pressure: < 1.7E-08 Pa at 25°C (QSAR)

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure of the sodium salts of HEDP has been read across from the parent acid. A limit vapour pressure value of <1.7E-08 Pa at 25°C was obtained using accepted calculation method (MPBPVP program, USEPA/Syracuse Research, v1.43). The result (Fisk 2010) is considered to be reliable as a key study. This value represents the major constituent only and demonstrates that it is involatile.


The vapour pressure of the salts would be expected to be lower than for the parent HEDP acid form, hence the result is reported as <1.7E-08 Pa at 25°C.