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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.