UPVC Or PVCu stands for unplasticized polyvinyl chloride, with their own nature they're rigid and flexible and are used at the production of windows for both flats and plots. uPVC Is the ideal material for windows for its sturdiness and strength. They also require almost no routine maintenance. https://allen62.webs.com/apps/blog/show/47269107-an-unconventional-guide-on-double-glazing-windows