More difficult to process and generally requires pre-curing/cross-linking Long linear molecular chains similar to PTFE Table 3 details the characteristics of each, and Table 4 lists the strengths and limitations. Two types of PPS are available: linear and branched. ![]() It works in conjunction with the whole system: Anytime a shaft has run out or wobbles, a PPS bushing stabilizes the shaft. PPS primarily appears as shaft stabilizing bushings. ![]() PPS has about the same hardness as PET but with broader chemical and temperature resistance. Sometimes, it is referred to as PET’s older, more established brother. It has a broad temperature range and chemical resistance. Polyphenylene Sulfide (PPS) is a higher-cost, very hard material. Table 2 details its strengths and limitations. It is very dimensionally stable, fairly inexpensive, and easy to machine. PET is primarily used in conjunction with proprietary fillers for vertical pump bushings. With a relatively low service temperature, it is only good to about 210 ℉. It is primarily used for bearings and bushings. ![]() Polyethylene terephthalate ( PET) is a very hard, dense material. Table 1 details the material’s strengths and limitations. An inexpensive option, it is compatible with most other materials. PTFE has a wide temperature range and broad chemical resistance. It is the most commoditized engineered industrial plastic because of its dependable nature for many purposes. Polytetrafluoroethylene (PTFE), a universal material, performs well in many applications. Plastic should be selected carefully to match the parameters of each application. Each has unique characteristics, strengths, and limitations. These five are the primary bases for most industrial, high-performance plastics. These components cannot be constructed from any plastic on the shelf.
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