PEI copolymers take higher heat.GE Advanced Materials Advanced Materials is a leading peer-reviewed materials science journal published every two weeks. Advanced Materials includes Communications, Reviews, and Feature Articles from the cutting edge of materials science, including topics in chemistry, physics, q formerly GE Plastics) in Pitts-field, Mass., is extending the application range of its Ultem polyetherimide (PEI) resins by raising their heat resistance. New PEI-sulfone copolymers boost PEI's glass-transition temperature (Tg) to 247 C, or 30[degree]C above conventional PEI, while retaining similar flow-ability and transparency. The highest heat resistance is provided by Ultem XHT XHT Expandable Home Theatre , introduced at NPE NPE NullPointerException (Java) NPE Network Processing Engine NPE National Policy on Education NPE National Plastics Exposition NPE Natural Penis Enlargement NPE Nutrition Program for the Elderly 2003 as Lexan XH6050. Its Tg is 247 C, making it the most heat-resistant, injection moldable amorphous resin available, according to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. GE. It is aimed at auto fog-lamp reflectors. High-heat PEIs also appear in three new electrical films marketed as alternatives to polyimide Pronounced "poly-ih-mid." A type of plastic (a synthetic polymeric resin) originally developed by DuPont that is very durable, easy to machine and can handle very high temperatures. Polyimide is also highly insulative and does not contaminate its surroundings (does not outgas). . Ultem 1000B, 5000B. and EXSP0023 films have Tgs of 217 C, 225 C, and 245 C respectively. They are offered in up to 48-in. width and thicknesses of 2 to 28 mils (50 to 700 microns). Uses include electronic bar-code labels, insulation tapes, wire wrap, and flexible circuitry. Tel: (413) 448-5700, www.geadvancedmaterials.com [ILLUSTRATION OMITTED] |
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