19% TO 82% BETTER SHEAR STABILITY
ROLL STABILITY TEST (ASTM D-1831)
In this test a sample of grease is worked for 60 strokes and its penetration is measured in accordance with the ASTM D-1403 “Test For Cone Penetration of Lubricating Grease Using One-Quarter and One- Half Scale Cone Equipment”.
After the worked penetration is determined and recorded a 50 gram sample of grease that has not been worked is placed in the test cylinder and distributed uniformly on the inside wall of the cylinder.
A weighted roll is placed inside the cylinder , the cap tightened and the entire cylinder assembly is mounted onto the test assembly.
The test assembly is started and the weighted roll revolves along the inside of the cylinder at 165 rpm for a period 2 hours.
At the end of a two hour rolling period the cylinder assembly is dismantled and the grease being tested is removed so that its worked penetration according to the ASTM D-1403 can be determined.
From the before and after penetration readings the percent change in consistency is calculated.
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