Journal of Fire Sciences

The relation between components of urethane-modified polyisocyanurate foams and their combustion behavior was observed to compare with rigid poly urethane foams, using the specially designed burning test apparatuses. Accord ing to the vertical smoke-weight determination for chipped samples, almost all foams lost their weight at about 650 °C. The amount of generated smoke became maximum at about 500 °C for polyurethane foams and at about 600 °C for polyisocyanurate foams. According to the horizontal smoke-concentration deter mination for small plate samples, fires occurred with much amount of generated smoke at about 600 °C. Through both the testings, adoption of higher functional isocyanate, secondary polyol, lower molecular weight polyol, or amine catalyst brought much smoke generation. Polyisocyanurate foams showed little smoke as compared with polyurethane foams.

Low molecular weight fuels, ethanol, n-hexane, acetone etc., which are close to the thermal decomposition products of polymers such as polyethylene, poly styrene, cellulose, etc., were combusted in a tube furnace.

A simple study aimed at predicting the Thermochemical Response of honey comb sandwich panels is presented. The overall thermal conductivity coefficient for the panel is obtained through a consideration of the convective gas move ment within the cell spaces. The earlier correlations of Catton and Edwards are used. The analytical solution for the one-dimensional approximation is quoted from an earlier study.