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The water absorption of the expanded polystyrene board (eps board) is higher than that of the extruded polystyrene board (XPS board), and it is easy to absorb water, which is a disadvantage of the material. The water absorption rate of the thermal insulation board has obvious influence on its thermal conductivity. As the water absorption increases, its thermal conductivity increases, and the thermal insulation effect also deteriorates, so this should be paid special attention.
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