Composite earth boring bit seal

摘要: A high performance rock bit journal seal is formed from a composite material comprising an elastomeric and nonelastomeric polymeric material. The preferably in the form of fibers compiled or woven into sheet. may include one more lubricant additives. comprises number repeating sheets fabric that are bonded together with can either be entirely partially material, which case it preferred wear dynamic surface remaining portion used as primary seal, secondary dual bit. Seals display enhanced resistance, reduced coefficient friction, improved high-temperature stability endurance when compared to noncomposite materials, thereby both extending useful life seals therefrom bits employ such seals.