Ruichen Sealing Co., Ltd.
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U-cups are a lip seal, named for the cross-section’s distinctive “U” shape. They are used for both dynamic and static applications. The “U” shape energizes the sealing lips as the application pressure increases. This brilliant design has been modified to create several unique configurations. These modifications provide additional benefits for a variety of applications.
As we can see in the drawing, the cross section have two lips, so they are also known as lip seals.
Description of NBR
Besides NBR, materials used on the asymmetrical seals vary from Urethane, and FKM to possibly Ethylene Propylene (EPR), Fabric and Rubber, Highly Saturated Nitrile (HSN) or PTFE.
1、Excellent Abrasion-Resistance,Good Rebound Resistance
2、Good Tensile Strength and Elongation
3、Excellent Animal and Vegetable Oil Resistance
4、Good Oil and Fuel Resistance
5、Good Water Resistance
1、Poor Oxygenated-Solvent Resistance
2、Poor Ozone Resistance
-40℃-100℃, -55℃-120℃(special formula)
1、Fuel tank, lubricating oil tank and oil in the hydraulic oil, gas, water, silicone grease, silicone oil and other Fluid medium rubber parts, especially the sealing parts.
2、It is currently the most widely used, the lowest cost of rubber seals.
U-Cups are used interchangeably for piston or rod sealing.They are commonly used in linear applications to seal the rod or piston. Usually used in air pump, hydraulic cylinder.
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