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Physical & Chemical properties

Vapour pressure

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Description of key information

The reported vapour pressure of the xylene isomers at 25˚C ranges from 0.882 to 1.167 kPa. The vapour pressure of m-xylene is 1.106 kPa, for o-xylene is 0.882 kPa and for p-xylene is 1.167 kPa. The mean value is 1.052 kPa.

Key value for chemical safety assessment

Vapour pressure:
1.052 kPa
at the temperature of:
25 °C

Additional information

Zwolinski and Wilhoit (1971) is a peer reviewed handbook and so can be considered reliable and suitable for use as the key study for this endpoint. Vapour pressures for the xylene isomers are not reported for 25˚C. However, the handbook does provide the Antoine constants to allow vapour pressures at other temperatures to be calculated. Although we have extrapolated outside the reported temperature range to derive this range we believe that the calculated values are an acceptable estimate of the vapour pressure at 25˚C as the state of the substance will not change in this temperature range. The data are supported by results from the CRC Handbook (Lide 2008), with vapour pressures for m-xylene, o-xylene and p-xylene of 1 kPa at 23.4˚C, 1 kPa at 27°C and 1 kPa at 22.4°C, respectively.