Waterproof and breathable polymer film and coatings are permeable to water vapour molecules and not to permit water droplets to penetrate through them.
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- 防水可呼吸性是指聚合物薄膜及涂层不允许水滴透过,同时却要保证水蒸汽分子自由透过,达到防水可呼吸的目的。