What is CPVC Pipe? CPVC is a thermoplastic made by further chlorination of polyvinyl chloride resin. In its chemical structure, two carbon atoms are bonded with two hydrogen and two chlorine atoms. These molecules combine to form polymer chains of CPVC. CPVC offers superior resistance to degradation and offers long service life. CPVC (chlorinated polyvinyl chloride) is a durable material that has been used successfully in plumbing applications worldwide for over 50 years. CPVC’s inherent c...