Unverified80% confidenceFactTime unknown
面料仅有防晒涂层的帽子多次水洗后UPF会衰减，选择原纱防晒（纤维本身含防晒成分）的产品耐久性更好，涂层款清洗次数一般不超过20次防晒力就明显下降
1
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80%
Confidence
Long-term
Relevance
-
First Seen
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Unverified物理防晒（面料致密度、深色、涂层）比化学防晒剂涂层更耐久，反复水洗后UPF衰减更小；宣称'含防晒助剂'的浅色帽子洗涤20-30次后防护会明显下降93% similarUnverified涂层类防晒帽不建议频繁机洗或用力揉搓，涂层随洗涤次数增加会脱落导致UPF值下降，原纱防晒面料则耐水洗且防晒性能稳定92% similarUnverified防晒口罩水洗后UPF会衰减，选择标注'50次水洗后UPF仍≥40'或采用原纱防晒（如凉感锦纶+氨纶物理编织遮挡）而非后整理涂层的产品，涂层型洗几次防晒力就明显下降92% similarUnverified面料涂层型防晒口罩（如钛白粉/氧化锌涂层）水洗20次后UPF值会明显衰减，选购应认准'原纱防晒'（防晒因子织入纤维），标注'洗涤50次UPF不衰减'的产品耐用性更佳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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