The flame retardant and smoke suppression effect of serial metal hydroxystannates on semi-rigid PVC

The flame retardant and smoke suppression effect of serial metal hydroxystannates on semi-rigid PVC was studied.The flame retardant and smoke suppression mechanism of metal hydroxystannates was investigated through quantitative analysis and the SEM of the residual char after sample burning.The results showed that samples treated with flame retardants had higher limiting oxygen index(LOI) and char yield,lower smoke density rating(SDR) and maximum smoke density(MSD),and better flame retardant and smoke suppression performance.The flame retardants had a little effects on the mechanical properties of materials since its using amount was small.