Features of O-Ring :
1. O-Rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable, and have simple mounting requirements. They can seal tens of megapascals (thousands of psi) of pressure.
2. O-Rings are available in round, quad, and square cross-section shapes. The shape, or profile, of an o-ring is relevant to its application.
3. O-Rings are available in a variety of materials for use in different applications. Temperature, lubrication, sealing pressure, and chemical compatibilities are important factors to consider.
Material grade of O-Ring: 
Viton, NBR, EPDM, etc.
Application of O-Ring:
Successful O-ring joint design requires a rigid mechanical mounting that applies a predictable deformation to the O-ring. This introduces a calculated mechanical stress at the O-ring contacting surfaces. As long as the pressure of the fluid being contained does not exceed the contact stress of the O-ring, leaking cannot occur.
An O-ring, also known as a packing, or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.
The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring. Dynamic examples include rotating pump shafts and hydraulic cylinder pistons.
O-rings are mechanical gaskets that provide a pressure and fluid seal at the interface of two parts in dynamic and static applications. They are round in shape and vary by size and cross-section shape. O-rings are typically made of elastomers such as nitrile and silicone, and are used in engines, faucets, flanges, valves and cylinders.
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