A new line of thermoformable polycarbonate sheets incorporates GE Plastics' highly weatherable Lexan SLX resin for demanding Class A surface applications. Alextra coextruded sheet from Allen Extruders Inc., Holland, Mich., is made of glossy SLX capstock over various substrates. It is aimed at transportation, agriculture, personal recreation, and marine industries. One of the first uses is exterior bus panels. Weather resistance and gloss retention of SLX capstock enables these sheet products to compete with thermosets such as RIM, RTM, and other fiberglass composites, according to Allen sales manager Mike Ringquist. Among the three new products, Alextra MV, with a PC/ABS substrate, has good impact strength and HDT of 225 F. Alextra TS (also with PC/ABS) has higher stiffness, a CLTE near that of thermoset glass composites, and an HDT of 280 F. Alextra ET is based on Lexan EXL, a PC/silicone copolymer, and offers low temperature ductility to -60 C, HDT of 275 F, and good chemical resistance. These materials boast a high depth of image, high regrind compatibility, and easy formability. Widths up to 72 in. and thicknesses from 0.060 to 0.500 in. are available.
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