Definition: Refers to the ability of grease’s structural system to resist deformation and flow under mechanical shear forces.

① Mechanical stability is an important performance characteristic of grease and a key factor affecting its service life.

② The mechanical stability of grease mainly depends on the type of thickener and the preparation process.

③ Methods for analyzing the mechanical stability of grease include shear stability testing, roll stability testing, and grease leakage testing for automobile wheel bearings.

? Test Standards:

? Method 1: GB/T 269 “Test Method for Shear Stability of Grease”, Equivalent Method: ISO 2137-1985;

? Method 2: SH/T 0122 “Test Method for Roll Stability of Grease”, Equivalent Method: ASTM-D1831