APPLICATION DETAIL Zip Fastener A zip fastener consists of a fabric tape, a zip fastener chain, top and bottom end pieces and a slide. In an open-ended zip fastener, one end piece is a fixed half into which the other end piece is pushed. While the slide is usually made of metal, many zip fasteners employ plastic materials for all the other non-fabric parts. Celanese developed a special grade of Hostaform® acetal copolymer that is an excel

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