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- (Poly vinylchloride) is manufactured in the form of a white powder. Before it is fabricated, various additives such as stabilisers and plasticisers are introduced. Unplasticised PVC - the UPVC of so many replacement windows, is hard and strong, and has numerous uses in the construction industry. Plasticised it is more flexible and can be used for coatings, insulation etc. A considerable amount of research exists which cast doubts on the environmental and health effects of the life cycle of PVC - its disposal is a particular problem. Several european countries have now banned the material, which makes its continued use in the replacement window industry all the more frustrating.