Plastic injection moldable engineering

Poly(butylene terephthalate) (PBT) is produced in a much smaller voliune than PET. However, PBT is more widely accepted as an injection-moldable engineering plastic in the large automotive and electronic markets due to its faster crystallization rate (Pratt and Hobbs 1976). Hence, PBT is more commonly employed in the formulation of blends also. PBT has generally been preferred over PET in the engineering plastics arena because of its superior processability, faster crystallization rate, shorter molding cycles, and better properties (DTUL/impact balance) in the molded parts, particularly in the unfilled form. Nevertheless, PET is also used to... 

Polyphenylene oxide (Noryl from GE) and polyphenylene sulfide (Ryton from Phillips) are used as high-temperature engineering plastics. Polyphenyl ether sulfones are manufactured by a number of companies under a variety of trade names including 720P, 220P by ICI and RADEL by Union Carbide. They are generally used as injection-moldable thermoplastics and in the adhesive and composite industry. 

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