Fire Safety Science Digital Archive

This note discusses the results of previously reported experiments on the effect of the expansion and shear strength of foam on its resistance to radiant heat. If the probable effect of foam drainage is discounted the ratio of the time to destroy the foam to the time to evaporate its water content is found to vary by no more then 70 per cent for the whole range of properties examined. This ratio, moreover can, except for the results with foam of expansion 13.5, be correlated directly with the specific surface of the water in the foam. The results of experiments with foam of expansion 13.5 appear to be anomalous.