CPVC is a thermoplastic produced by chlorination of PVC resin. CPVC is the first choice of material for potable water supply and is in used across the world for more than 50 years. Chlorinated polyvinyl chloride pipe is the most used piping in building construction in most parts of the world, outpacing ordinary polyvinyl and metal and copper alternatives. Builders often prefer it because it is very durable, resists corrosion, and has very high temperature thresholds.