Unverified70% confidenceFactTime unknown
遮阳篷的UPF防护会随水洗次数和布料老化下降，涂层类防晒布洗涤20-30次后防护力明显衰减，而纤维本身高密度织造的面料防晒更耐久
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70%
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Long-term
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Unverified防晒效果会随洗涤和拉伸衰减：涂层型面罩水洗20-30次后UPF明显下降，追求耐用应选纤维本身致密（非涂层）的原纱型防晒面料94% similarUnverified化纤类防晒面料的UPF不因水洗降低，可长期使用；但含棉混纺或喷涂防晒剂的口罩水洗20-30次后防护力明显衰减，看清材质标注93% similarUnverified防晒效果依赖织物密度和后整理涂层，涂层型口罩水洗30次后UPF会明显衰减，选择原纱防晒(如冰氧吧/凉感纱)的产品耐洗性更持久93% similarUnverified防晒衣防晒力主要靠面料密度、纤维本身和涂层三种途径，其中涂层型（后整理）水洗20-30次后UPF会显著衰减，原纱型（二氧化钛混入纤维）耐洗性更强，长期使用选原纱型92% similarUnverified涂层类防晒口罩水洗后UPF值会逐渐衰减，一般30-50次水洗后防晒力明显下降；纤维本征型（如高密涤纶、原液着色纱）耐洗性好，注重耐用选纤维型92% similar
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