Analysis of fire gases released from polyurethane and fire-retarded polyurethane coatings

We have investigated the analysis of smoke and gases generated under variou s thermal decomposition conditions of polyurethane (PU) and fire retarded p olyurethane coatings. The use of Fourier Transform Infrared Analysis has al lowed the continuous detection of a number of the most important fire gases . We have shown that the addition of ammonium polyphosphate (APP) in PU sha rply decreases at the same time the emission of toxic gases such as CO or H CN, the optical density of smoke, the weight loss and the formation of soot . Expandable graphite, when added in PU, enables a decrease in toxic gases in a lower proportion than APP. In addition, rye note that oxidation reacti ons strongly influence the nature of the combustion gases in case of fire.