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There are three main types of material used to manufacture window frames for double-glazing. These are aluminium, PVC-u and wood. These are also vinyl-coated and fibreglass frames, but for simplicity at this stage we shall stick to the three main types. The three materials each have their strengths and weaknesses and in this article we shall look at the several properties to see how each type shapes up. The properties we look at are heat insulation, sound insulation, security, appearance, maintenance and least but definitely not least, cost. We shall also briefly talk about the different styles of windows commonly available today.