The flash point of a mixture can be calculated with Properties → Solvent Flash Point, if pure compound flash points are given as input.
Here we mix equal volumes of water (assuming a density of 0.997 kg/L) and ethanol (assuming a density 0.789 kg/L). For a flash point calculation the pure compound flash points are needed as input, since COSMO-RS does not predict pure compound flash points. The ADF COSMO-RS module uses Le Chatelier's mixing rule to calculate the flash point of a mixture.
Select Compounds → Compounds Select 'ethanol' Enter '286' for the 'Flash point' of ethanol Select Properties → Solvent Flash Point Change the popup menu 'Mole fraction' in 'Mass fraction' Select 'ethanol' for the first component in the Solvent Select 'water' for the second component in the Solvent Enter '0.442' for the 'Mass fraction' of ethanol Enter '0.558' for the 'Mass fraction' of water Press 'Run'
In this case the calculated flash point will be close to 25 °C.