Definition: The dropping point of grease is the temperature, expressed in degrees, at which the first drop of grease sample drips from the grease cup in a dropping point apparatus. This temperature is known as the dropping point of the grease.

Key Points:

① The dropping point is an indicator of the thermal stability of grease and can predict its maximum operating temperature.

② The higher the dropping point, the better the high-temperature performance of the grease. It provides an estimate of the maximum temperature limit for grease usage.

③ The dropping point also reflects the grease’s resistance to leakage. It is influenced by the type and quantity of thickener used.

④ Generally, the higher the thickener content, the higher the dropping point, and the less likely the grease is to leak. The dropping point should exceed the working temperature of the lubricated part by 20–30°C.

? Test Standard: GB/T 3498 “Test Method for Dropping Point of Grease Over a Wide Temperature Range”, Equivalent Method: ASTM-D 2265