Standardization and Selection of a Method for Evaluating Shear Resistance of Lubricating Oils with Polymer Additives

摘要

The wide use of polymer additives increasing the viscosity index of mineral oils justified the usefulness of selecting a standard laboratory method for evaluating the shear resistance of this kind of oils. The suitability of a particular method was analyzed on the basis of comparative tests performed in Poland and abroad using mechanical methods (in a laboratory and on stands), operational tests, and ultrasonic methods, including the method developed in the Institute of Aeronautics. The ultrasonic method described and incorporated in branch standard BN-70/0535 was accepted as the most advantageous method from the standpoint of standardization requirements.