polycarbonate lexan!

polycarbonate lexan

Comprehensive Analysis

1) "Polycarbonate" -- As to polycarbonate lexan poly�car�bon�ate Pronunciation: -'kär-b&-"nAt, -n&t Function: noun : any of various tough transparent thermoplastics characterized by high impact strength and high softening temperature Pronunciation Symbols 2) "Lexan" -- As to polycarbonate lexan Bottles made of Lexan LEXAN® is a registered trademark for General Electric Company's brand of highly durable polycarbonate resin thermoplastic intended to replace glass where strength justifies its cost. It is a polycarbonate polymer consisting of chains of Bisphenol A alternating with carbonyl chloride, also known as phosgene. The trademark holder promotes the style "LEXAN", but both "Lexan" and "lexan" are commonly used (at least outside the context of sales literature), without implying claims about its source. Lexan was discovered in 1953 by GE chemist Dr. Daniel Fox, while working on a wire coating. Dr. Hermann Schnell of Bayer in Germany applied for a U.S. patent on a virtually identical molecule the same year that GE filed for a patent, 1955, but Dr. Fox is generally credited with the discovery. Lexan is similar to polymethyl methacrylate (Plexiglas/Lucite/Perspex) — commonly described as Acrylic — in appearance, but is far more durable, often to the point of being described as "bulletproof" (depending on the thickness of the sample and the type of weapon used). Lexan is used in the aerospace industry for aircraft canopies, windscreens and other windows, but can be found in household items, such as bottles, compact discs, and DVDs. It is also used to make Bullet-resistant glass. The ASP 9mm features transparent grips made of Lexan, so that the rounds in the magazine are visible. Lexan is manufactured by GE Plastics, a unit of General Electric. It is manufactured at several GE plants, the largest being in Mt. Vernon, Indiana; Cartagena, Spain; and Bergen op Zoom, The Netherlands. GE Plastics is headquartered in Pittsfield, MA. Jack Welch, former CEO of GE, started as a chemical engineer in this division in Pittsfield. Perhaps the most visible Lexan consumer product is the Apple Computer iBook and the iPod; the gleaming white plastic is GE Lexan. It also is used by Nalgene for their 1-liter wide mouth water bottle, popular with hikers and mountaineers. Nalgene participates in Lexan's publicity. Lexan is also used by other water bottle manufacturers. Lexan is used for magazines..." 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Polycarbonate Physical Properties Density (ρ) 1200-1220 kg/m³ Abbe number (V) 34.0 Refractive index (n) 1.584-6 Flammability V0-V2 Limiting oxygen index 25-27% Water absorption - Equilibrium(ASTM) 0.16-0.35% Water absorption - over 24 hours 0.1% Radiation resistance Fair Ultraviolet (1-380nm) resistance Fair Mechanical Properties Young's modulus (E) 2-2.4 GPa Tensile strength (σt) 55-75 MPa Compressive strength (σc) >80 MPa Elongation (ε) @ break 80-150% Poisson's ratio (ν) 0.37 Hardness - Rockwell M70 Izod impact strength 600-850 J/m Notch test 20-35 kJ/m² Abrasive resistance - ASTM D1044 10-15 mg/1000 cycles Coefficient of friction (μ) 0.31 Thermal Properties Melting temperature (Tm) 267°C* Glass transition temperature(Tg) 150°C Heat Deflection Temperature - 10 kN (Vicat B)[citation needed] 145°C Heat Deflection Temperature - 0.45 MPa 140°C Heat Deflection Temperature - 1.8 MPa 128-138°C