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AEGIS SGR™
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WILMINGTON, Del., July 19, 2005 - The new AEGIS™ shaft grounding coupling promises to protect motor bearings against electrical damage produced by shaft current. Electro Static Technology, an ITW Company based in Mechanic Falls, Maine, produces the coupling using eight key housing and sealing parts molded from glass-reinforced, flame-retardant grades of DuPont™ Zytel® HTN high-performance polyamide and Zytel® nylon 66 resin. Zytel® HTNFR52G30BL, a PPA (polyphthalamide) resin, serves for a two-piece end cap (right photo) located inside the assembled stator (left photo). "These parts must withstand frictional heat generated by contact with the rotor during break-in and occasionally during subsequent operation," said William Oh, business unit manager at Electro Static Technology. Zytel® nylon 66 is used for the slinger (the black, ring-shaped component visible in the left photo) and five internal stator components. The parts meet needs for a combination of high stiffness, strength and toughness plus dimensional stability, UL94 V-0 performance, resistance to breakdown by shaft current up to 10 amperes, resistance to maximum operating temperatures up to 250ºF (121ºC) and molding productivity. Electro Static Technology rates the coupling for continuous operation up to 250ºF (121ºC). Typical operating temperatures are lower, however, about 150ºF (66ºC), according to Oh. During molding, both the Zytel® HTN and nylon 66 resins run consistently well with high yields and fast cycling, according to Dan Hutchens, president of Molding, Tooling and Design, Inc., Saco, Maine. For additional information, visit www.mtdplastics.com. The end cap resin, Zytel® HTN FR52G30BL, delivers a major advantage over several other high-temperature polymers in that it can be molded in water-controlled tooling. The nylon 66 resin is Zytel® FR50. "The AEGIS™ shaft coupler provides a simple, cost-effective way to extend the life of bearings for AC motors controlled by variable-speed drives," said Oh. By providing a continuous discharge path for shaft current generated by such motors, it combats the formation of fusion craters, which ultimately result in severe frosting and fluting. For more information, contact Electro Static Technology at 866-738-1875 or visit www.est-aegis.com on the web. For more information about DuPont engineering plastics, please visit plastics.dupont.com on the Web or call DuPont at 800-441-0575. DuPont is a science company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture, nutrition, electronics, communications, safety and protection, home and construction, transportation and apparel. Note to editors: Please do not assign a reader service number to any article based on the information in this release. Instead, please direct your readers to plastics.dupont.com for additional information. The DuPont Oval, DuPont™, The miracles of science™ and Zytel® are registered trademarks or trademarks of DuPont or its affiliates. EGIS™ is a trademark of Electro Static Technology, an ITW Company. Contacts: Sales: Public Relations:
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© 2007 Electro Static Technology, an ITW Company