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Triple-wall or multi-wall polycarbonate sheet is manufactured by an extrusion process, with integral webs between the walls. It is light in weight (3.2kg/m2), weather and impact resistant and light-transmitting. It is also an insulant; triple-wall 16mm thick sheet has a U-value of 1.7 W/m2K; the thicker 25mm sheet has a U-value of 2.4 W/m2K. Makrolon polycarbonate surfaces for external use have an integral coat which improves durability; surfaces for internal use are coated with a water-dispersa

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