By looking at the diverse types, let's first figure out what exactly uPVC windows are. uPVC is an abbreviation for unplasticized polyvinyl chloride—a challenging, rigid type of plastic. Unlike traditional PVC, uPVC lacks plasticizers in its composition, which makes it more rigid and an ideal material for windows. This kind of window is good in insulation, can resist weather conditions, and is easy to maintain. Being environmentally friendly, uPVC is easily recyclable and has a long life.