Plastic Pipes Conference Association # 2021 Amsterdam
Saleem Shakir
Unplasticized formulations based on Poly(Vinyl Chloride) (PVC) and Chlorinated Poly(Vinyl Chloride) (CPVC) resins offer technical solution to pressure piping systems that find extensive use in residential and industrial applications. Building upon the desirable properties of the vinyl monomer, the chlorine content of CPVC brings additional heat resistance and enhanced flame retardancy that extends its use in a wide variety of applications including hot water. Although PVC is also derived from the vinyl monomer, the properties of each material is to be respected. Formulations with blends of PVC and CPVC resins have been attempted but the compromise has to be taken into consideration. This paper will present analytical techniques such as Dynamic Mechanical Analysis (DMA) and Differential Scanning Calorimetry (DSC) to reveal the behavior of such blends whereas the results of bulk property testing can be misleading. Adherence to Cell Class targets (ASTM D1784 1 ) and meeting the required Hydrostatic Design Basis (HDB) (ASTM D2837 2 ) at elevated temperatures can be compromised.
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