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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure at 20°C was calculated from the average headspace concentration using the ideal gas equation as described previously. The vapour pressure of Cylcamen Aldehyde Extra was found to be   0.3 Pa at 20°C 

Key value for chemical safety assessment

Vapour pressure:
0.3 Pa
at the temperature of:
20 °C

Additional information

The method used was that described in the OECD Guidelines for Testing of Chemicals, 104, Gas saturation method. The amount of test substance present in a gas phase saturated with test substance is determined by specific analyses. The vapour pressure can easily be calculated from this saturated headspace vapour concentration assuming that the ideal gas law is obeyed.

A sufficient quantity of the test substance, around 1 g, was deposited in the closed head space vessel, which was fixed on a support in a temperature controlled water bath, bought to temperature and allowed to equilibrate. A sampling volume of 80ml avoided depletion of the test substance from the vapour phase. Samples were analysed via GC-FIR.

The mass of the test substance in the volume sampled from the headspace container was calculated from the average analytical concentrations and the solvent volume used to desorb the sorbent cartridge using the ideal gas equation.

The vapour pressure at 20°C was calculated from the average headspace concentration using the ideal gas equation as described previously.

The vapour pressure of Cylcamen Aldehyde Extra was found to be  0.3 Pa at 20°C