What is the difference between uPVC and PVCu?
There is no real difference between uPVC and PVCu. Both terms refer to unplasticised (hard) PVC, which is used extensively in building products where rigidity is an important attribute. Plasticised (soft) PVC on the other hand is used where flexibility is important, for example medical tubing applications, insulation sheathing on electrical wiring, etc. Saying PVCu has more to do with commonality of terminology world-wide than it is to do with formulation.