O Ring ESR Vacuum Quartz Upper (old style). Material: Nitrile
O-rings are the most frequently used of all seals. The suitability of O-rings as good vacuum seals stems from their ability to adapt to the minute unevenness of the mating surfaces. The surface of the O-ring must be free of releasing grease or talcum, smooth and crack-free and scratch-free. The rings should be seamlessly pressed, the parting of the pressing tool should be on the level of the ring diameter and can be removed by grinding.
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