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Types of Double Glazed Window Hinges UPVC window hinges often go under the radar and are often forgotten about yet they serve an important job. The oiling of the hinges every now and then will save you energy, money and keep you warm! The right uPVC hinge for your double-glazed windows is easy if you know what to look for. The thickness of the hinge arm (13mm and 17mm) as well as the track's outer diameter (18mm) are the most important factors to look for. UPVC UPVC is a popular material for doors and wind