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特点：外表一面是骨架，一面是橡胶，双唇口，有弹簧设计，通常使用在密封压力低于1bar之场合，增加防尘的唇部提供对主唇的保护，双唇间中空处填入油脂以防止轴的腐绣，在无润滑的情况下亦能短暂运转。
Characteristics: One side of the surface is the skeleton, and the other side is the rubber. It has double lips and the spring design. It is often used on occasions where the sealing pressure is lower than 1bar. The lip part increasing the dust prevention provides the protection for the main lip, and oil will be added between the two lips to prevent the corrosion and rusting of the axis. It can operate temporarily when there is no lubrication.
材质：NBR（丁晴橡胶）、ACM（亚克力橡胶）、
Material Quality: NBR (Nitrile Butadiene Rubber), ACM (Acrylic Rubber)
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