The vapour pressures of the separate isomers of permethrin have been determined over a range of temperatures by two laboratories using different versions of the gas saturation method. A statistical analysis of the sets of data from the two laboratories shows no significant differences for the cis isomers but a small difference in the 20°C extrapolated values for the trans isomer exists. However, this difference is discounted as arising from experimental error and the mean values of the estimated vapour pressures at 20°C are given as 2.5 @Pa (cis) and 1.5 pPa (trans).
The vapour pressures of cypermethrin have been determined independently, at elevated temperatures in two different laboratories, by different versions of the gas saturation method. A subsequent statistical analysis showed no significant differences between the two sets of data. The mean of the values, extrapolated to 20°C, is 1.9 × 10−7 Pa (1.4 × 10−9 mmHg). A description of one of the methods, previously unpublished, is included as an appendix.
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