Since the melt viscosity of CPVC is at least 2 times that of PVC, and the processing temperature is high, the release of hcl due to thermal decomposition during processing causes difficulties in processing and molding and corrosion of equipment. In the extrusion process, how to achieve the ideal "plasticization" (plasticization in place) of CPVC, a high-viscosity material, is the key to CPVC processing technology. Therefore, it has special requirements for the formulation.
