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The extinction performance of a proprietary synthetic foam liquid, normally used for the production of high expansion foams, has been measured on 0.279 m^2 . (3 ft^2) petrol fires, the foam being applied with expansion of about 10 at a rate of 0.04 l/m^2/s (0.05 gal/ft^2/min). Control time was found to be a function of expansion as well as of shear stress. With optimum foam characteristics, control time was equal to that obtained with fluorochemical foam, and superior to all other types of foam which have been tested. Under the test conditions used, best results were obtained at an expansion of 12 and a shear stress close to 10 N/m^2.