BAE Systems HybriDrive

Rubber Seals & Tubing

Available from Timco Rubber Products Inc.

Depending on the relative motions acting upon them, rubber seals and rubber gaskets can be classified as one of two types.

Static Seals
A static condition exists in a sealing application when there is little or no motion of the mating assembly parts upon the seal itself. This type of seal typically has only an initial compression (the sealing of a hose joint), or periodic compressions caused from opening and closing (door seal in a house).

These seals, when compressed, will cause pressure to act in a vertical direction relative to the seals face, thus squeezing between two opposite surfaces to eliminate any gaps between them. This is common in both o rings and face gaskets.

In undertaking a static seal application, the compression forces should be properly assessed. The recommended compression range for static rubber seals is 10-30% with an upper limit of 50%. If the compression is too high, a variety of design elements can be added to alleviate any difficulties.

• The part can be looked at to be made in sponge or foam
• A lower durometer can be pursued
• The walls can be thinned

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