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Chlorinated polyvinyl chloride (CPVC) is created when PVC homopolymer undergoes a chlorination reaction resulting in additional chlorine atoms on the base molecule. The result is an amorphous polymer similar to PVC in composition with a higher heat distortion temperature. This provides a material with high temperature strength and excellent flammability properties that also exhibits many of the desirable physical characteristics of polyvinyl chloride such as exceptional corrosion resistance and good mechanical properties.

CPVC has an upper working temperature limit of 200°F or approximately 60°F above that of PVC, which greatly increases the product's application range and makes it advantageous for many
aggressive high temperature processing applications such as plating and chemical processing.

CPVC is used in the manufacture of pipe, fittings, valves, machining shapes, sheet and duct, offering advantages for piping and related applications due to its high glass transition temperature, high strength
to weight ratio, pressure bearing capability, corrosion and chemical resistance, and low friction loss characteristics.

In addition to chemical inertness and mechanical strength, CPVC products have excellent flammability properties when compared to other plastics and many common building materials. It will not support
combustion, is rated as self-extinguishing and has very low flame and smoke characteristics. These unique fire resistance properties enable product applications that are unacceptable for many other plastics, such as use in fire resistant construction and fire sprinkler piping applications.

Similar to PVC processing, CPVC is manufactured into various products by extrusion, injection molding and calendering. Joining and fabrication is also accomplished by solvent cementing, hot air welding, thermoforming, machining and hot sheet welding.

Although PVC and CPVC are similar in nature, they are not the same. Care should be used when investigating and comparing the chemical resistance, processing, joining/fabrication techniques and applications of PVC and CPVC.

The minimum physical properties of compounds for use to manufacture CPVC are called out in ASTM Standard D1784. Within this standard, the compounds are separated into Cell Classification numbers that reflect the actual minimum physical properties of the compound with regard to impact strength, tensile strength, modulus of elasticity, deflection temperature under load, flammability and chemical
resistance. The Cell Classifications called out within this standard help define and establish a basis for selecting and identifying various grades of CPVC compounds for correlation to specific applications.

Industrial Piping Applications
(Pipe, Valves, Fittings, Sheet)
Sheet, Rod and Tube
  • Chemical processing
  • Plating
  • Water and waste water treatment
  • Corrosive fume handling (duct)
  • Hot and cold water plumbing
  • Fire sprinkler piping
  • High purity applications
  • Condensate return lines
  • Pulp and paper industries
  • - Food contact applications
  • Corrosive resistant tanks and vessels
  • Corrosive resistant workstations and equipment
  • Pump and valve components
  • Spacers, hangers, stiffeners, hubs and other mechanical components
  • Nuts, bolts, fasteners
  • Fume scrubbers

PVC and CPVC Tolerances

Rod Specifications Sheet Specifications
DiameterTolerances Tolerances
1/4" to 7" dia.+3%/-0% Extruded  Press Laminated
   Thickness+ 5% Thickness+ 10%
DiameterLength Width+1/2"/-.000" Width+3/16"/-.000"
1/4" to 2"10' Length+3/4"/-.000" Length+1/8"/-.000"
2-1/8" to <5"5'        
5" to 7"2' CPVC        
 4' CPVC