Blending CPVC and PVC

Blending CPVC and PVC

TempRite® Engineered Materials CPVC is designed to blend easily with existing PVC formulations. The resulting PVC/CPVC blends are easy to process into a variety of end-use applications.

Adding CPVC to PVC results in a number of advantages in terms of performance and safety. PVC/CPVC blends offer:

  • Higher softening temperatures
  • Better flame retardancy
  • Lower smoke density
  • Lower shrinkage
  • Increased flexibility
  • Improved resistance to corrosive chemicals

The process for blending CPVC and PVC differs slightly depending on whether the final resin is intended for a flexible or a rigid application.

When blending TempRite Engineered Materials CPVC into flexible profile applications, the addition of CPVC resin leads to shorter and lower plasticisation, a lower melt viscosity, a better melt homogeneity and an overall improved appearance of the final product.

Absorption of plasticiser will begin at a higher temperature compared to normal PVC – typically 40°C higher – and the viscosity of the resulting blend will be lower. As a consequence, two options exist for blending in a turbo-mixer: using the standard process and maintaining the maximum temperature below 100°C; or adding the CPVC only after the plasticiser is absorbed by the PVC, or at the very end of the dry-blending process. Adherence to either of these procedures will ensure a lump-free, homogenous end product.

When blending TempRite CPVC into rigid profile applications, the addition of CPVC resin only modifies the rheology slightly. Sometimes the addition of CPVC also results in a shorter gelation or plasticisation period.

 

Heat-Resistant CPVC Applications

Heat-Resistant Applications

Increased temperature and heat resistance for improved dimensional stability

Fire-Resistant CPVC Applications

Fire-Resistant Applications

Improved fire resistance due to reduced flame spread, smoke development resistance and lower smoke density, resulting in an improved Euroclass rating

Flexible CPVC Applications

Flexible Applications

Increased softness, reduction in the amount of plasticiser and flame retardant required, and improved fire performance

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