Unverified75% confidenceFactTime unknown
TPU防水膜透湿量普遍达3000-5000g/㎡/24h，远优于PVC(几乎不透湿)，是可透气防水垫的主流材料标准
1
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75%
Confidence
Long-term
Relevance
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Unverified防水层克重≥90g/㎡的TPU膜可承受机洗甩干不脱膜，低于60g/㎡的薄膜多次洗涤后易起皱漏水，尿床/漏奶高频场景应选≥90g/㎡且标注可机洗的产品85% similarUnverified厚材质防浸泡与轻量之间需权衡：0.5mm TPU 20L约重500-700g，轻量尼龙涂层袋同容量仅150-250g但只防泼溅，登山轻量党选轻款+电子设备单独套硬防水盒83% similarUnverified真正防水的风衣面料克重需≥180g/m²且带PU/TPU涂层或防水膜（防水指数≥5000mm），普通聚酯纤维标注'防泼水'只能应对小雨，中雨会渗透83% similarUnverified透气性与防水性此消彼长：透气用MVTR值衡量，≥15000g/m²/24h为高透气；20000mm以上高防水膜（如硬壳）透气普遍偏弱，长时间快走易内部凝水，压缩款优先选透气膜（如三层软壳/2.5层轻量膜）81% similarUnverified防水层选TPU膜优于PU/PVC涂层：TPU耐水解、耐洗次数可达80-100次仍不漏，PU涂层洗30-50次后易开裂脱层导致渗漏81% similar
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