Um, give me one thing that changes. DDDYou're young, things change.
http://en.wikipedia.org/wiki/LexanLexan is a registered trademark for SABIC Innovative Plastics' (formerly General Electric Plastics) brand of polycarbonate resin thermoplastic. Polycarbonate polymer is produced by reacting bisphenol A with carbonyl dichloride, also known as phosgene. Lexan is the brand name for polycarbonate sheet and resin in a wide range of grades. Applications are mainly in three domains–building (glazing and domes), industry (machine protection and fabricated parts) and communication and signage. Common usages include space and sports helmets, clear high performance windshields and aircraft canopies, and bullet resistant windows.
Bullet-resistant glass is usually constructed using polycarbonate, thermoplastic, and layers of laminated glass. The aim is to make a material with the appearance and clarity of standard glass but with effective protection from small arms. Polycarbonate designs usually consist of products such as Armormax, Makroclear, Cyrolon, Lexan or Tuffak, which are often sandwiched between layers of regular glass.
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