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An Introduction To Upvc Windows And Similar Products By: Chris Coxon | Sep 23rd 2010 - Un-Plasticized Polyvinyl Chloride or uPVC windows and doors provide several advantages over the traditional materials for similar products. For example, the products made by using uPVC tend to be more energy efficient, weather resistant and economical, and require limited maintenance to keep them functional. Tags:upvc windows, composite door, bi folding doors