Abstract
Measurements have been made of the viscosity changes with time which a commercial aluminum stearate grease undergoes, immediately after it has been heated to given temperatures and maintained at these temperatures under shear. When the equilibrium viscosity attained at any temperature is plotted against temperature, the curve obtained indicates the occurrence of a phase transformation in the grease, which is considered to be the transition from the paste to the jelly. It is concluded that the aluminum stearate grease is essentially a metastable jelly at temperatures below the transformation temperature, but transforms slowly to a paste on aging, the rate of transformation being accelerated by shear.
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