The oxidation of PVC materials PVC pipe production line was not in the fire protection technology embodied in the study of flame retardant technology, PVC plastic China exists a tendency, one-sided pursuit of the oxygen index increased, ignoring smoke performance. Statistics show that 79% of the fires were fatal to smoke. Some UPVC tubes have an oxygen index of more than 50%, but the amount of smoke is very high when burning, and the temperature of VEKA is only between 70 and 90 degrees centigrade.

UPVC pipe has been widely used in high-rise buildings, but the fire problem has not been paid enough attention to, and no suggestion has been made on the installation of UPVC pipes during fire special acceptance. (1) rain, sewage and ventilation risers are arranged as far as possible along the exterior wall of the building. (2) when the rain, sewage and ventilation risers are in the building, they shall be installed in the pipe well, or protected by non combustible materials such as brick and concrete block. (3) the branch pipe which is discharged into the standpipe of the drainage pipe adopts metal drainage pipe or adopts strict fire prevention measures for the branch pipe, such as steel bushing, inorganic fireproof sleeve, etc.. (4) the fittings for drainage shall be made of metal as much as possible.