This paper discusses the flame resistance of PVC products made of compounds containing flame retarding additives. The major additive types are phosphate esters, chlorinated paraffins, antimony oxide, hydrated alumina and borates. Of these, the phosphate esters and antimony oxide are the most widely used due to many factors. These compounds are discussed in some detail. Recent developments in PVC flame suppressants are briefly reviewed and the forecast for the future is included, particularly in development of smoke suppressants. Extensive test data are presented in curves.