Acetal is a high-performance engineering polymer often used for parts that would otherwise be made of metal. Chosen for its distinct characteristics, it is widely used in both machining and injection moulding. There are two types of acetal. Homopolymer, produced by DuPont as Delrin®, consists of a chain of identical oxymethylene units. Copolymer, introduced by Celanese as Celcon®, consists of a chain of alternating oxymethylene and oxyethylene units. While the two acetals differ in some ways, they share basic characteristics.
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