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Xiamen Best Seal Imp.and Exp.Co.,Ltd.
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Silicone O-ring

The O-ring is the most common type of fluid seal.  An O-ring's simple design lends itself to a multitude of sealing uses, including static, reciprocal, oscillating, and dynamic applications at low speed and pressure.  In elevated operating pressure environments, addition of a backup ring will greatly increase the extrusion resistance of an O-ring. 
The most basic shape of an O-ring is a simple circular sealing torus, usually made from an elastomeric material. Beyond the standard O-ring, Best Seals can supply more advanced sealing designs such as Quad Rings, which are specially designed for low pressure sealing.  Best Seals also offers O-rings in advanced materials such as Viton®, Viton Extreme®, and Teflon®.