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EC number: 203-396-5
CAS number: 106-42-3
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.
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.
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