General Characteristics of Semi-Crystalline Plastics: Sharp melting point Difficult to thermoform Opaque Good chemical resistance Difficult to bond using adhesives or solvents Resistant to stress cracking Good fatigue resistance Good for bearing and wear (as well as structural applications) Semi-crystalline plastics can be considered for a variety of applications. Selecting a plastic material for use in a high temperature environment requires careful review of material properties data. View our interactive Thermoplastics Triangle to compare materials. Acetal High strength, stiff, low friction engineering plastic with good wear properties. HDPE Durable, versatile, low cost, abrasion and chemically resistant plastic material. LDPE Soft, flexible, lightweight plastic material that is easy to fabricate and form. Nylon Strong, stiff engineering plastic often used to replace metal bearings and bushings. PBT Strong, stiff plastic, good machining characteristics, bearing and wear, and chemical resistance. PEEK Strong, stiff plastic with outstanding chemical resistance; performs over a wide range of temperatures. PET A strong, dimensionally stable plastic with outstanding chemical resistance and wear properties. Polypropylene Low cost, chemical resistant plastic with excellent aesthetic qualities. PPS Plastic material with excellent chemical and corrosion resistance at elevated temperatures. PTFE Low friction engineering plastic with outstanding chemical, high temperature, and weathering resistance. PVDF High purity engineering plastic with excellent chemical, abrasion, and flame resistance. UHMW Extremely tough abrasion resistant, low cost plastic, used for a wide range of wear applications.