GF Harvel CPVC Duct pipe is extruded from a light-gray-colored Chlorinated Polyvinyl Chloride (CPVC) compound with a Cell Classification of 23447 per ASTM D1784. This enables GF Harvel Duct to safely carry a maximum service temperature of 200ªF. GF Harvel CPVC Duct is chemically resistant to most acids, bases, salts, aliphatic solutions, oxidants, and halogens. Detailed chemical resistance data is available and should be referenced for proper material selection.