Ask the expert.Q: We are looking for Looking for In the context of general equities, this describing a buy interest in which a dealer is asked to offer stock, often involving a capital commitment. Antithesis of in touch with. a material to be able to form laser microvias that also has CTE (Coefficient of Thermal Expansion) The difference between the way two materials expand when heat is applied. This is very critical when chips are mounted to printed circuit boards, because the silicon chip expands at a different rate than the plastic board. control for leadless component attach reliability and is capable of passing a 1 meter drop impact test for handheld personal electronics. What do you recommend? A: Arlon's nonwoven non·wo·ven adj. Made by a process not involving weaving. Used of textiles. n. Material or a fabric made by a process not involving weaving. aramid (NWA NWA Northwest Airlines (ICAO code) NWA Northwest Arkansas NWA National Wrestling Alliance NWA National Weather Association NWA National Works Agency (Jamaica) NWA Network Analyzer ) laminates offer world-class performance for CTE control. In response to needs foi higher reliability and performance, Arlon has developed two substantially improved epoxy systems for NWA, both of which result in improved copper peel strength in finished clad laminates and PWB's. The best peel strength is achieved with the 55ST product, in which an interpenetrating polymer network achieves exceptional internal cohesion between the aramid fibers and resin, resulting in peel values of 10 lb/in for 1 oz (35 micron) Copper. 55ST was especially designed to minimize risk of pad lifting during G-forces generated by drop testing. A second resin system, 55LM, exhibits 8 lb/in peels with 1 oz Cu, while also exhibiting extremely low moisture regain, comparable to multifmletional FR-4 and substantially improved over epoxy systems used with other NWA's. This offers fabricators improved material handling while delivering a highly reliable circuit hoard for personal electronics and other CTE-sensitive applications. As with Arlon's other NWA products, 55ST and 55LM are lightweight (25% less than glass-epoxy), exhibit low in-plane CTE's of 9-12 ppm/[degrees]C, excellent surface flatness and planarity and inherently resist CAF CAF - constant applicative form formation. In addition. NWA' s exhibit good registration stability and inhibit resin microcracking due to random microfiber mi·cro·fi·ber n. An extremely fine synthetic fiber that can be woven into textiles with the texture and drape of natural-fiber cloth but with enhanced washability, breathability, and water repellancy. reinforcement, making it an ideal substrate for laser mierovia and HDI HDI Human Development Index (UNDP yardstick of human welfare) HDI Help Desk Institute HDI Humpty Dumpty Institute (New York, New York) HDI High Density Interconnect applications. Additional information is available on Arlon's website at www.arlon-med.com. Have a question: email us at experts@arlon-med.com Featured Arlon Expert Ronald Kirby, Director of Euro Sales & Product Support |
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