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RHEOLOGICAL PROPERTIES OF GREASES OVER WIDE TEMPERATURE RANGES.
ARMY WEAPONS COMMAND ROCK ISLAND ILL RESEARCH AND ENGINEERING DIV
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Routine physical characteristics were determined for ten lubricating greases of varying types. The roll stability test for lubricating grease, ASTM D1831-64, was performed on each grease at eleven temperatures ranging from -65 F to 250 F and for extended periods of time. The apparent viscosity, ASTM D1092-62, was determined for each grease at the same temperatures. Curves were constructed from the roll stability, apparent viscosity and yield stress data. A departure from the general trend of the slope of these curves was taken as a possible phase change or transition temperature. The wear preventive characteristics of lubricating grease, ASTM D2266-64T were determined for two greases that gave indications of having definite phase changes. Wear tests were made over the working range of temperatures for each grease. The results did not show any noticeable change in lubricity of the grease occasioned by the indicated phase change. Author
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