UPVC – Unplasticized Polyvinyl Chloride is a form of plastic. It is also considered as Rigid PVC which is a resistant from of PVC and is often used for pipework and window frames due to its hard consistency. It has many features like excellent performance, durability, very little maintenance, and no bending. If you use it for your windows, it would be great value for money due to its thermal efficiency and sound insulation. With UPVC windows, you can be rest assured that even in the harshest weather conditions your windows will not warp, rot, or rust.