Unverified70% confidenceDecision RuleTime unknown
防晒帽的UPF防护会随反复洗涤、拉伸和汗渍侵蚀而衰减，物理遮挡型（宽檐+密织）比化学涂层型耐用性更好，选购追求持久防护应看织物密度而非仅涂层
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70%
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Long-term
Relevance
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Unverified防晒袖套的UPF防护会随反复洗涤和拉伸下降，尤其依赖织物密度而非涂层的产品；建议一个夏季强度使用后更换，涂层型褪色发白后防晒力显著衰减不宜再依赖90% similarUnverified涂层型防晒袖套（表面有涂层增加UPF）透气性差、洗几次涂层脱落防晒失效；原纱型（纤维本身防紫外，如添加二氧化钛的锦纶）更耐洗持久，认准原纱防晒标识88% similarUnverified涂层型防晒帽（化学防晒剂涂层）的UPF值会随洗涤次数下降，认准纤维本身高密织造或添加二氧化钛的物理防晒面料，防护更持久87% similarUnverified防晒面罩的UPF防护会随洗涤次数和面料拉伸变形而下降，物理遮挡型（致密织造）比涂层型更耐洗，涂层型洗几十次后防护明显衰减87% similarUnverified涂层型防晒帽（表面涂胶/银胶）防晒靠涂层，多次水洗和摩擦后UPF会明显衰减；纤维本征防晒（高密织造+原液着色）耐洗性远优于涂层款86% similar
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