Unverified90% confidenceDecision RuleTime unknown
真正的全遮光需要面料内衬含涂层或三层复合结构（表布+黑丝遮光层+里布），克重≥300g/㎡；单层涤纶染色布最多做到70%-85%遮光，仍会透白光
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90%
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Long-term
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Unverified涂层遮光布（黑丝/三层夹层）遮光靠涂层，克重通常300-400g/㎡；高织高密提花布靠纱线密度遮光更透气但遮光率多为85-95%，纯全黑需靠涂层实现88% similarUnverified真正遮光靠的是布料背面的黑丝或涂层，'三层编织无涂层'的遮光布克重需≥260g/㎡才能达到90%以上遮光，纯色纺织无涂层布几乎无法全遮光86% similarUnverified真正的高遮光靠面料本身密织+黑丝涂层实现，而非颜色深浅。选购时应把面料对着强光看是否透光，深色但薄的窗帘可能仅遮光70%，浅色三层复合布反而能达99%85% similarUnverified涂层遮光布（背面白色/黑色胶层）遮光率高但不透气、易折痕开裂；提花三层编织布遮光率同样可达99%且垂感透气更好，长期使用优选后者84% similar
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