(Scanned original: to be superseded.)

ESDU 96021 presents vapour pressure data for 41 esters from C4 to C10 obtained by a critical evaluation of experimental results in the literature. The limited data available were extrapolated using a correlation developed relating the behaviour of the coefficients of the Wagner equation to the behaviour of the ideal gas and liquid heat capacities. The Wagner equation was fitted to the data from the melting point to close to the critical point (except for some compounds for which it was cut off around 0.9 critical) and the coefficients are given for each compound. Two tables of vapour pressure calculated using the equation are given: one in SI units at 5 K intervals and one in mm Hg or atmospheres at 5 degree C intervals. A table also gives saturation temperatures at various specified pressures and indicates the possible uncertainty in the calculated values. Values of acentric factor, normal melting and boiling points, and the slope of the saturation temperature versus vapour pressure curve at the normal boiling point are also given together with a list of the sources of data for each compound. Density data for the compounds are given in ESDU 96022 and the choice of critical point values gave the best correlation for both properties.