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This patent describes the manufacture of a seal with graded properties that may be used as the bearing seal in a down-hole rock bit. A property gradient is formed in a seal, or a section of the seal, from the exterior surface inwards without changing the seal composition. The property change is created by use of an electron beam.
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A photocurable composition is described that is intended to improve reworkability as a sealing material, while securing an adequate hardness. It contains a photocurable liquid resin, a (meth) acrylate monomer and a photopolymerization initiator. The photocurable composition is composed of a hydrogen
This patent is concerned with the duo-cone type of mechanical face seal that is used in earthmoving equipment applications. Elastic layers (28, 29) are used on the conical surfaces of the seal rings and housing respectively. The purpose is to inhibit entrainment of debris.