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EC number: -
CAS number: -
The viscous liquid sample was maintained below 100.75 °C while
establishing the vapour pressure relationships. The sample remained in
the oven at the end of the experiments and there were no obvious signs
of decomposition during the test.
Sputtering and some condensation of sample onto the balance pan was
observed, but the mass difference method alone was used to determine the
In Run 1, the mass difference at ambient temperature (23.6 °C) was 1.4
µg resulting in a vapour pressure of 1.82E-03 Pa.
A vapour pressure curve was not used in Run1 to provide a room
temperature value of vapour pressure.
The degassing was subsequently confirmed by Run 2, in which the initial
measured mass difference was only around 0.2 µg at 26.1 °C. Run 2 and
subsequently Run 3 (initial measured value 0.16 µg at 27 °C), covered
the temperature range up to about 100 °C with comparable mass
differences agreeing within a factor of about two or better. Less
statistical error occurred in Run 2 in attempts at extrapolation. The
following vapour pressure was extrapolated from Run 2:
Vp (25 °C) = 1.874E-04 Pa
With slope around -3779K and calculated error range of about 6 %
(compared to Run 3 with an error range of 14 %).
The vapour pressure of the test material was evaluated in a study
conducted in accordance with EU Method A.4 using the effusion method:
vapour pressure balance. Under the conditions of the test, the vapour
pressure of the test material was determined to be 1.874E-04 at 25 °C.
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