O-ring seal for rock bit bearings

Details O-ring seal for rock bit bearings O-ring seal for rock bit bearings

F - Mech Eng,Light,Heat,Weapons

16

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F16J 15/54 (2006.01) C08K 3/04 (2006.01) C08L 15/00 (2006.01) E21B 10/22 (2006.01)

Patent

CA 2096300

A dynamic O-ring seal for retaining the lubrication around a rock bit bearing for drilling subterranean formations has a composition comprising 100 parts by weight highly-saturated nitrile elastomer, furnace black in the range of from 40 to 70 parts by weight, peroxide curing agent in the range of from 7 to parts by weight, graphite in the range of from 10 to parts lay weight, zinc oxide or magnesium oxide in the range of from 4 to 7 parts by weight, stearic acid in the range of from 0.5 to 2 parts by weight, and sufficient plasticizer to provide a Shore hardness no more than A 80.

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