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Materials 'air out' BMW air duct

Materials Editor Gary Chamberlain cites noteworthy elastomer products

By Gary Chamberlain -- Design News, July 20, 1998

Combine a hard polypropylene core and a soft, elastic sealing component and what do you get? For BMW, the material duo significantly cut costs for air duct systems versus previous ducts made of thermoset rubber, copolyester, and polypropylene. The BMW system requires high-temperature resistance and elasticity, as well as long-term properties to ward off chemicals and aging for under-the-hood operation. Using 3D/sequential blow molding, Santoprene thermoplastic rubber from Advanced Elastomer Systems (AES) is molded with a hard polypropylene/glass-fiber material. True to its name, 3D/sequential blow molding enables the production of parts in three dimensions, while allowing molders to change from one material to another during the production of one part. "This application has excellent potential for automotive OEMs around the globe," says Juergen Gloeckler, AES' automotive director, Europe. Advanced Elastomer Systems: Product Code 4375

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