O rings are used to seal liquids or gases against leakage and loss, which work as mechanical seals for every machine requiring fluid containment. The shape of an o ring is akin to that of a doughnut in its mathematical description, from which it derives its name. Furthermore, because of its circular shape, an o ring is well suited for both static or dynamic applications.
How to select the material?
Four points help you make a selection of o ring material.
How to describe an o ring?
There are three crucial dimensions (inner diameter, outer diameter, cross section) to measure an o ring when trying to find the right size of o ring.
Getting the right hardness.
Getting the right hardness is one of the key factors to selecting the right o-ring for your application. It is measured by the Shore A durometer, the higher the durometer, the harder the compound. Generally, 70 durometer hardness should be used whenever possible, as it offers the best combination of properties for most o ring applications.
O-ring applications are categorized by the type of relative motion occurring between the mating surface. Static applications involve sealing between two mating parts that do not move. Dynamic sealing describes applications where the mating parts are moving in relation to on another.
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