Abstract: Self-lubricating bearings, such as journal-type bearings are obtained by molding under pressure at elevated temperatures a substantially homogeneous blend of from about 70 to 95% of an ultra high molecular weight ethylene polymer and from about 5 to 30% of a normally solid lubricant which can be a wax, fat or mixtures thereof, or a mixture of either or both of these lubricants with a grease. The bearings exhibit excellent dimensional stability, good wear resistance, and a surface which is not oily to the touch. The bearings are self-lubricating, slowly releasing lubricant at temperatures developed in ordinary use.

Abstract: A machine for testing and comparing bearings of the plain or sliding type and bearing materials comprising one or a pair of bearing test stations each having a test bearing housing for fixedly retaining a selected test bearing. A rotatably driven shaft is journalled in the test bearing. Means are provided for applying a predetermined load radially on the test bearing in the housing and means are also provided for measuring the friction force generated by rotation of the shaft in the test bearing, whereby the coefficient of friction of the test bearing can be determined. Means are also provided for damping oscillations occurring in the test bearing housing and for limiting rotation of the test bearing and housing under excess generated friction force.