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DuPont Zytel HTN resins smooth path to lead-free circuit assembly

Du Pont Engineering Polymers : 25 June, 2007  (New Product)
DuPont scientists have developed the new LX series of DuPont Zytel HTN high performance polyamide to meet growing demand for electronic components that can withstand the higher temperatures required for board assembly with lead-free solders.
David Glasscock, Americas business manager for High Temperature Solutions at DuPont Engineering Polymers said “Connectors and other parts molded from Zytel HTNLX deliver outstanding performance in surface-mount reflow processes using lead-free solder.'

Operating temperatures with lead-free solder are typically in the 250ºC to 260ºC range, about 20 to 30 degrees higher than those employed with conventional lead-containing solder.

“During assembly at these higher temperatures and during molding, Zytel HTNLX delivers valuable advantages over several alternative polymers,” Glasscock added. Among them:

Faster line speeds. Zytel HTNLX withstands higher peak reflow temperatures than PA46 and other similar PA6T polymer grades. Higher temperatures result in faster solder melting, thus enabling increased line speed.

Less part breakage. Test data using actual connectors show more toughness for Zytel HTNLX than PA9T and PPS polymer grades and greater weld line strength than PA9T, PPS and another PA6T. Increased toughness pays off with reduced damage of parts and assembled circuits during shipping, handling and service.

Water-controlled molds. Molders can avoid the drawbacks of oil temperature control with Zytel HTNLX. Unlike PA9T and another PA6T, it can produce fully crystallized parts when molded in water-controlled tooling.

Faster molding, more design freedom. During molding, Zytel HTNLX flows more easily than PA9T and other PA6T grades. Better flow can allow faster molding cycles, lower injection pressure, and successful molding of parts with thinner walls and/or longer flow paths.

Several electronic manufacturers in Asia are already profiting from the use of Zytel HTNLX. In a connector for subscriber identity module cards in mobile phones, for example, Wooyoung Company Ltd. of Korea is benefiting from its resistance to higher reflow temperatures and its excellent dimensional stability, toughness and strength. Commercial applications at other manufacturers include surface-mount switches and input/output connectors.

New LX series resins are glass-reinforced flame-retardant materials with a V-0 classification under the UL94 standard. Grades with glass-fiber content of 20, 30 and 45 percent are available.

Zytel HTN is one of ten families of high-performance engineering polymers supplied by DuPont.

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.
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