As  a  new  engineering  plastic  materials,CPVC  is formed by chlorination of  PVC monomer polymer.After   chlorination,the irregularity and polarity of the molecular bonds of PVC resin will be increased,improving the solubility  and chemical stability of the resin,thus the resistance  of  the  material  to  heat,acid,alkali,salt  and  oxidant  corrosion  will  be  increased  accordingly.
The chlorine content  is increased from 56.7%to   63-74%,the Vicat softening temperature is increased  from 72-82℃to   90- 125℃,the maximum applicable temperature is 110℃,the long-term applicable  temperatureis 95℃,and the  servicelife   is   up   to   50 years.
The glass trausition temperature Tg of CPVC willincrease significantly with the increase of chlorine  content.Therefore,CPVC has become an energy conservation and environmental protection product  because  of   its   relatively  low  installation cost,high strength,chemical  inertia,excellent mechanical strength,non-conductivity,and the       safest  combustion conductivity and smokiness.