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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

 <0.00001 Pa at 20 °C (QSAR, ARChem SPARC v4.6)

Key value for chemical safety assessment

Additional information

The vapour pressure is evaluated based on the QSAR estimates for 3 representative structures of the target substance: Propylene glycol C18:1 diester, propylene glycol C18 diester and propylene glycol C18:1 monoester. The following vapour pressure values were calculated by ARChem SPARC v4.6: 2.61E-14 Pa, 4.3E-15 Pa and 6.3E-7 Pa for respective constituents ordered as above.

According to EU Method A.4 (2008), Appendix 1 - Estimation method:

"Calculated values of the vapour pressure can be used to help identify those cases where omitting experimental measurement is justified because the vapour pressure is likely to be < 1E-5 Pa at ambient temperature."

Considering the results obtained from QSAR evaluation, a vapour pressure < 0.00001 Pa is taken as a conservative key value for the chemical safety assessment for this substance.