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Some time ago Subcommittee V of ASTM Committee D-2 on Petroleum Products and Lubricants was requested to investigate methods for measuring viscosity at rates of shear up to 1,000,000 reciprocal seconds. Interest in the subject stemmed from the fact that the use of additives of various types in lubricants and fluids is increasing rapidly and the resultant viscosities of such products may vary with use, in which case, the values obtained in conventional equipment might not indicate their performance in use. Since previously published methods for measuring viscosity at high rates of shear had proved quite unsatisfactory due to unknown temperature values, Subcommittee V was requested to investigate the subject and, if necessary, to devise the equipment. Since a test program would necessitate the expenditure of funds, a request was made of the American Petroleum Institute Committee on Petroleum Products to finance the project, using funds collected from the sale of API viscosity standards. This project was approved and a subcommittee appointed by the API to supervise the program. The subcommittee's attention was called to the existence of two test methods which looked very promising. One of these methods incorporated the use of the Kingsbury tapered-plug instrument which had been used by Mr. S. J. Needs in his studies. The heart of this device is shaped much like a sleeve bearing; consequently, results from it should bear some relationship to bearing performances. The other test method had been in use at Pennsylvania State College by Mr. Fenske in his study of hydraulic liquids. In this case capillaries are used to measure viscosities. In view of the promise that these test methods indicated, arrangements were made to have some oils tested by those two procedures.
Geniesse, J. C.
Director, The Atlantic Refining Co., Philadelphia, Pa.