A mathematical model that may be used to predict the flash point of multiple component solutions has been proposed and is shown to be adequate for some specified systems, such as ternary solutions. The ternary solutions methanol + methyl acetate + methyl acrylate and methanol + ethanol + acetone were used to validate this proposed model. The model is able to predict the flash point precisely over the entire composition range of such ternary solutions by utilizing the flash points of the individual components. If the binary parameters for a ternary solution are not accessible, a model based upon the binary parameters of binary solutions may provide a very acceptable means of predicting the flash points for the ternary solution as revealed by a comparison between predicted and experimental data. A further finding is that the minimum flash point exhibited by a binary highly nonideal solution may disappear on addition of a specific third component. (C) 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.