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Thermal analysis, in particular the derivatograph and its improved variants, were used to characterize flame retardation processes in solids. The techniques presented in this paper are applicable both to solid—liquid and to gas—liquid transitions. Naturally‐occurring and synthetic polymers and flame retardants of practical importance were chosen as model substances. The results confirm data obtained using other methods. The advantages and the limits, in the application of thermal analysis to the field of flame retardation, are discussed.

ChemInform Abstract The adducts (I), derived from 2,5-dichloro-3-methyl-1H-phospholes and dichlorocarbene, decompose at 135 rc C, producing isomeric dihydrophosphorines (II) and (III).

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