According to a plant engineer, this standardization provided insurance against contamination of high purity products and an extra margin of performance in both mechanical and elevated temperature properties. Summary It should be obvious from the diversity of applications described that selection of the optimum thermoplastic material for a given set of service conditions requires interchange between the user and the pump manufacturer. Operating temperature range is a basic consideration, as is the specific resistance of the various thermoplastics to the chemicals involved. Once these two variables have been considered, however, the abrasive characteristic of the fluid plays a significant role. So does the requirement for ultrapurity that calls for natural or unpigmented materials.
Cost is also significant, since the cost of pumps in the available materials differs greatly.
However, they offer significant advantages in terms of chemical resistance, abrasion resistance and temperature limitations. Where this translates into extended service life and reduced maintenance, initial pump cost becomes less significant. PVC AND CPVC - Polyvinyl Chloride PVC is the largest volume member of the vinyl family. It has excellent resistance to electroplating chemicals and a wide variety of strong acids, caustics, salts and solvents. This ultra high molecular weight polyethylene offers good impact strength, abrasion resistance and toughness, plus broad chemical resistance and a low coefficient of friction.