Lube-Tech
The mixing of these five neat greases (Biobased : Mineral Oil-based) resulted in six mixtures using numbers associated with these five greases:
6. 50:50 of Grease 1 : Grease 4 7. 50:50 of Grease 1 : Grease 5 8. 50:50 of Grease 2 : Grease 4 9. 50:50 of Grease 2 : Grease 5 10. 50:50 of Grease 3 : Grease 4 11. 50:50 of Grease 3 : Grease 5
The eleven total samples were tested for Dropping Point, Sheer Stability, and High-Temperature Storage Stability properties. The latter should be helpful to determine the impact of heating on mixture of two different greases.
Table 2 shows changes in the penetration values of neat and mixed greases before and after heating and test in a Grease Worker at 60 up and down strokes. For high-temperature storage stability, the sample grease was twice worked 60X and then its penetration value was determined: once without heating and once after storing at 120°C heat for 70 hours. The change in these penetration values was calculated on both the neat greases and grease mixtures.
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.132 page 3
If the change in the penetration value of the mixture was equal to or between the changes of the constituent greases, the greases were considered compatible. If the change in the penetration value of the mixture was less than the lower constituent grease value or greater than the higher constituent grease value by 7 points or less, the greases were considered borderline compatible. If the change in the penetration value of the mixture was less than the lower constituent grease value or greater than the higher constituent grease value by more than 7 points, the greases were considered incompatible.
Figures 2 and 3 show examples of the appearance of a grease after being worked 100,000X (this is 100,000 down and up strokes).
Figures 4 and 5 show an example of the appearance of greases after they had been subjected to 120°C heat for 70 hours. Those greases were then worked 60X and were compared to the 60X Worked Penetration results of the same grease mixture that had been heated, thus providing the high-temperature storage stability results.
Table 2: High Temperature Storage Performance of Test Greases Neat and Mixed
LUBE MAGAZINE NO.161 FEBRUARY 2021
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