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Physical & Chemical properties

Vapour pressure

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Description of key information

Amyl Cinnamic Aldehyde had a calculated Vapour Pressure of 0.29Pa at 20°C

Key value for chemical safety assessment

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

Additional information

1.   Reason for Carrying out Vapour Pressure Calculation & Choice of Equation

A search was carried out to identify any reliable studies that were available. Only one was identified but when approached the company did not have a reliable report for the study and so a study could not be used.

There were two calculated values reported, one was based on the modified Grain method but no company was identified; also the method is not recommended (see discussion below).
 The second one just quoted a value less than, so was not satisfactory.

So it was decided to carry out a calculation in-house and possible methods were identified by reference to the standard Handbook of Chemical Property Estimation Methods Chapter 14 Vapour Pressure.
 Two methods are recommended, the range of applicability are as below:-

Antoine equation has applicability of 10-3to 760mmHg
Modified Watson Correlation has applicability of
 10-7to 760mmHg

If the vapour pressure is greater than 10-3mmHg, then the Antoine equation is recommended.
 The data quoted in the databases and HPV report were around 10-3mmHg, so this equation was used initially.