What indicators are used to measure the high temperature performance of grease?

Dropping point - Volatility ? Oxidation stability ˉ Colloidal stability ° High temperature fluidity ± Bearing performance 13. What is the dropping point? What is the relationship between the dropping point of grease and the actual use temperature?

Dropping point is an important quality indicator. Under normal circumstances, when the grease is heated under the specified test conditions, the first drop of liquid dripping from the grease cup of the instrument (or the temperature when the oil column flows out of 25mm) is its dropping point. The maximum use temperature of the grease can be roughly estimated by the dropping point. Generally, for soap-based grease, its use temperature should be 20-30oC lower than the dropping point. The higher the dropping point, the better its heat resistance. However, some greases are limited by the evaporation of the base oil, or because the system undergoes a phase transition (becoming a rubber-like gel that does not adhere to metal), so that the maximum use temperature is much lower than the dropping point. 14. What is the low-temperature fluidity of grease?

The indicator for measuring the low-temperature fluidity of grease is low-temperature torque, that is, the degree to which the grease hinders the rotation of a low-speed ball bearing at low temperatures (below -20oC). The magnitude of low-temperature torque is related to the difficulty and power loss of low-temperature starting of grease-lubricated bearings. The low-temperature torque of grease varies with the type of base oil. The smaller the unworked cone penetration of the grease, the larger the dynamic torque. The larger the starting torque, the greater the starting power consumption, and the worse the low-temperature performance of the grease.