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UPN - AS ASTON SEALSUPN 孔/轴用U型圈 材料 2 1 1 类型 聚氨酯 名称 SEALPUR 93 硬度 93 ShA 2 类型 丁腈橡胶 NBR 名称 RUBSEAL 70 硬度 70 ShA 应用范围 压力
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