4. Summary of Test Method
4.1 The Test Methods D1403 cone penetration of an approximately 50g aliquot of lubricating grease is determined. The grease is then subjected to low shear at 20 to 35°C (68 to 95°F) for 2h more or less 5min in a standard roll stability apparatus, before the cone penetration is again measured. The difference between the cone penetration before working and the cone penetration after is used as a measure of the effect of low shear working on grease consistency.
5. Significance and Use
5.1 The roll stability test is widely used in specifications. Test results are significant insofar as they can show a directional change in consistency that could occur in service. No accurate correlation is established between the test results and shear stability in actual service.
