O-Ring / Viton O-ring
The O-ring 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. They can seal tens of megapascals (thousands of psi) of pressure.
O-ring specifications labeling method: ID(inner diameter)* CS(cross section)
Vacuum applications
In vacuum applications, the permeability of the material makes point contacts quite useless. Instead, higher mounting forces are used and the ring fills the whole groove. Also, round back-up rings are used to save the ring from excessive deformation. Because the ring feels the ambient pressure and the partial pressure of gases only at the seal, their gradients will be steep near the seal and shallow in the bulk (opposite to the gradient of the contact stress See: Vacuum_flange#KF.2FQF. High-vacuum systems below 10^9 Torr use copper or nickel O-rings. Also, vacuum systems that have to be immersed in liquid nitrogen use indium O-rings, because rubber becomes hard and brittle at low temperatures.
O-ring specification & size
5x1.9, 6x1.9, 7x1.9, 8x1.9, 9x1.9, 10x1.9, 11x1.9, 12x1.9, 13x1.9, 14x1.9, 14x2.4, 15x2.4, 16x2.4, 18x2.4, 19x2.4, 20x2.4, 22x2.4, 
24x2.4, 25x2.4, 26x2.4, 28x3.1, 30x3.1, 32x3.1, 35x3.1, 38x3.1, 40x3.1, 45x3.1, 50x3.1, 55x3.1, 60x3.1, 63x3.1, 65x3.1, 68x3.1, 
70x3.1, 75x3.1, 80x3.1, 85x3.1, 90x3.1, 95x3.1, 100x3.1, 105x3.1, 110x3.1, 115x3.1, 120x3.1, 125x3.1, 130x3.1, 135x3.1, 140x3.1, 
145x3.1, 150x3.1, 155x3.1, 160x3.1, 165x3.1, 28x3.5, 30x3.5, 31x3.5, 32x3.5, 34x3.5, 35x3.5, 36x3.5, 38x3.5, 40x3.5, 41x3.5, 42x3.5, 
44x3.5, 45x3.5, 46x3.5, 48x3.5, 50x3.5, 51x3.5, 54x3.5, 55x3.5, 56x3.5, 50x5.7, 51x5.7, 60x5.7, 63x5.7, 65x5.7, 70x5.7, 73x5.7, 75x5.7, 
80x5.7, 85x5.7, 90x5.7, 95x5.7, 100x5.7, 105x5.7, 110x5.7, 115x5.7, 120x5.7, 125x5.7, 130x5.7, 135x5.7, 140x5.7, 145x5.7, 150x5.7,
 155x5.7, 160x5.7, 165x5.7, 170x5.7,
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