Unverified75% confidenceFactTime unknown
防晒面料的紫外线阻隔能力会随水洗次数衰减，涂层型面料水洗50次后UPF可能明显下降；应选纤维本身防晒（如原液着色纱线）而非后整理涂层的产品
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75%
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Long-term
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Unverified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94% similarUnverified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93% similarUnverified物理遮蔽型防晒（高密织物+浅色）比涂层化学防晒更耐洗，涂层防晒裤水洗30-50次后UPF值会明显衰减，认准'纤维本身防晒'或'凉感锦纶'工艺93% similarUnverified涂层型防晒面料多次机洗后UPF会下降，追求耐用应优先选择纤维本身防晒（原纱型/高密度织造）的产品，机洗50次UPF衰减更小91% 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91% similar
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