SHEAR AND MECHANICAL STABILITY

In many bearing applications a grease can be subjected to high mechanical

shear stresses or high loading conditions. These high mechanical shear

stresses or high loading conditions can severely work a grease. Unless the

grease exhibits good to excellent shear stability, the grease will either run

out of the lubrication area or will separate into its base oils and thickener

components, thus allowing the oil component to run out of the bearing and

leave the thickener behind to lubricate.

Shear stability is the property that best reflects a grease’s ability to retain

its integrity or consistency . It is a means of judging the grease’s ability to

“stay put” in the bearing. It is important that when a grease is worked in a

bearing, any change in the grease’s consistency must be moderate in

order for the grease to stay in the bearing and act a seal to prevent water,

dirt or other contaminants from entering the bearing.

Schaeffer Mfg’s Aluminum Complex Base Greases and Bentone Base

Greases due to not only their low thickener contents but also due to their

processing through a collodial mill after formulation in order tighten them

exhibit very good to excellent shear stability. This very good to excellent

shear stability results in the Schaeffer greases’ ability to moderately

harden in consistency when subjected to high mechanical shear stress or

high loading conditions. By moderately hardening in consistency, this

results in the Schaeffer Greases “staying put” in the bearing.

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