UPVC or PVCu stands for unplasticized polyvinyl chloride, by their very nature they are rigid and not flexible and are used in the production of windows for flats and plots. uPVC is the best material for windows because of its durability and strength. They also require very little maintenance. https://doubleglazedddoors.blogspot.com/2019/09/can-you-get-discount-on-double-glazing.html