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Vapour pressure

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Description of key information

<0.1 hPa at 20°C

Key value for chemical safety assessment

Additional information

The vapour pressure for other lubricant base oils is <0.1hPa at 20°C (CONCAWE, 2010a). The vapour pressure was determined using the D5191 test method. Additionally, experimentally measured vapour pressure of a solvent-dewaxed heavy paraffinic distillate base oil was found to be 1.7 x 10-4 Pa, although this value was lower than the method limit of sensitivity (Hazelton U.K., 1991). Since the hydrocarbon compositions of other lubricant base oils are exceedingly complex, vapour pressures for different hydrocarbon structures having C15, C20 and C50 carbon atoms were estimated using EPIWIN MPBPWIN V1.40 computer model. Therefore, the estimated values represent the potential vapour pressure range for hydrocarbon constituents in this category. The estimates showed vapour pressures for hydrocarbon structures of C15 to range from 5.8 to 9 x 10-3 Pa, C20 to range from 2 x 10-1 to 1 x 10-4 Pa, and C50 to range from 2 x 10-7 to 5 x 10-16 Pa.