The stability of lubricating grease primarily consists of the following three categories, with their definitions and influencing factors as follows:
Oxidative Stability
Definition: The ability of lubricating grease to resist oxidation during storage and use, closely related to the chemical properties of base oils, thickeners, and additives.
Influencing Factors:
Soap-based thickeners (e.g., lithium-based, sodium-based) exhibit varying catalytic effects on base oil oxidation, with lithium-based types demonstrating relatively better oxidative stability.
Organic/inorganic thickeners are inherently less prone to oxidation and do not catalyze base oil oxidation.
Colloidal Stability
Definition: The ability to maintain colloidal structure stability under heat or pressure and prevent base oil separation, assessed by oil separation rate.
Testing Methods: Includes standardized techniques such as pressure oil separation, cone-net oil separation, and centrifugal oil separation.
Improvement Measures: Optimizing the ratio of base oil to thickener, adjusting soap fiber structure, and adding stabilizers.
Mechanical Stability
Definition: The ability to resist consistency changes under mechanical shear forces (not directly mentioned in search results but a standard industry classification).
Oxidative stability and colloidal stability are particularly critical in lubricating grease performance, directly impacting its service life and storage stability.
SH269 Grease Worker according to GB/T269-91 "Grease and petroleum grease cone penetration determination" test standard requirements in the specified test conditions, after the change of mechanical shear work to judge the mechanical stability of grease, to extend the work cone penetration or shear stability, the unit is 0.1mm.
ASTM D217 ISO2137 Petroleum Products Lubricants Tester Mechanical Grease Worker
Grease Worker ASTM D217 for Measuring The Consistency of Lubricating Grease
ASTM D217 Lubricating Mechanical Grease Worker
Motorized Grease Worker, ASTM D217 Cone Penetration of Lubricating Grease
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