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Types of Double Glazed Window Hinges UPVC window hinges usually go by the wayside and are forgotten, but they do important work. A small amount of oil on the hinges now and then will save you money, energy, and keep you warm! If you know what to check then choosing the correct uPVC window hinge is straightforward. The main things to check are the track's outer diameter (18mm) and the thickness of the hinge arm (13mm or 17mm). UPVC UPVC is a very popular material for windows and doors because it's strong an