Main difference between CPVC and PVC is that CPVC has approx. 50% higher chlorine content than PVC. Due to the high chlorine content in CPVC or Chlorinated PVC, we are able to use moulded fittings and extruded pipe to handle higher temperatures up to 90 C, while PVC is only suitable up to 60 C.Post-chlorinated industrial PVC is the process used to improve the chlorine content to achieve CPVC.