CPVC Frequently Asked Questions

With more than 65 years of production and fabrication experience, SEKISUI CHEMICAL is a world leader in PVC (polyvinyl chloride), CPVC (chlorinated polyvinyl chloride) resin, and CPVC compound for building, automotive, aircraft, and medication markets.

Durastream CPVC is high-performance compound commonly used in extruded pipes and profiles, injection-molded fittings, and calendared sheet, due to the compound’s high-heat deflection, flame retardance, smoke suppression, and superior corrosion resistance. Durastream CPVC forms strong, durable components that consumers and manufacturers can rely on. As one of the leading producers of this versatile thermoplastic, we are happy to share a few frequently asked questions and answers.

Frequently Asked Questions

What is the difference between CPVC and PVC chemically?
How CPVC is produced?

CPVC is produced using PVC, water, and chlorine.

Photochlorination (UV or light energy) is the most popular chlorination method, but SEKISUI’s proprietary technology uses thermal chlorination (heat energy). See figure below for the 4 step process.

How is UV or light chlorination different from heat chlorination?

CPVC is produced using PVC, water, and chlorine.

Photochlorination (UV or light energy) is the most popular chlorination method, but SEKISUI’s proprietary technology uses thermal chlorination (heat energy).

Using the heat chlorination method during molding slows the rate of CPVC dehydrochlorination, requires less stabilizer, and results in CPVC resin that less likely to burn. 

What is the difference between CPVC and PVC performance?

CPVC has several key performance characteristics that differentiate it from PVC.

  • Heat Resistance

Heat Resistance is 10-40℃ higher than PVC. CPVC can be used for high temperature

applications like hot water pipes.

  • Mechanical Properties, Strength

Superior mechanical properties specifically at high temperatures outside the PVC range

  • Chemical Resistance

Superior chemical resistance in acidic or alkaline condition, making CPVC the better choice for industrial and chemical applications

  • Flame Retardance

Superior flame resistance. The optimal choice for fire sprinkler systems.

  • Relatively low cost

CPVC is reasonably priced when compared to comparable engineering thermoplastic material

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