The established method for calculating the flash point of a pure hydrocarbon compound such as benzene, which makes use of the Clausius- Clapeyron equation, is extended to petroleum fractions. This had not previously been thought possible, because of the fact that such fractions do not have a single normal boiling point for use as a limit in integrating the Clausius-Clapeyron equation. In this paper it is shown, with gasoline as an example, that the Reid va pour pressure can be used in place of the normal boiling point as a limit in the in tegration. Estimates of the latent heat of vaporisation and the lower flammability limit were also required, and these are explained completely.
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