(低密度聚乙烯)：具有以下优良性质：高撕裂强度，高耐化学性，防水性。
LDPE (Low Density Polyethylene) : Offers such advantage as tear strength and high chemical resistance. It is also waterproof.
复合防水屋面可以采用两种性质不同的防水材料复合使用，使其优点互补，达到提高屋面整体防水性能的目的。
The compound waterproofing roof may adopt two kinds of waterproof material, which make their advantage mutually and be able to reach the purpose of the perfect waterproof function of house roof.
LDPE(低密度聚乙烯)：具有以下优良性质：高撕裂强度，高耐化学性，防水性。
LDPE (Low Density Polyethylene) : Offers such advantage as tear strength and high chemical resistance. It is also waterproof.
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