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Types of Double Glazed Window Hinges UPVC window hinges are often under the radar and are often forgotten about, but they do important work. Lubricating the hinges every now and then will save you energy and money as well as keep your warm! If you know what to look for, choosing the right uPVC window hinge is easy. The primary things to consider are the track outer width (18mm) and the hinge arm thickness (13mm or 17mm). UPVC UPVC is a well-known material for windows and doors because it's durable and long-la