What are the testing items for lubricating grease?

1. Appearance: The lubricating grease should be uniform, without obvious layering, bubbles, precipitation, contamination, and foreign objects.
2. Penetration: The penetration of lubricating grease refers to the depth at which the needle is inserted into the grease at a certain temperature, which is an indicator reflecting the viscosity and fluidity of the grease.
3. Drip point: The drip point of lubricating grease refers to the temperature at which the grease begins to lose its lubricating ability at a certain temperature, and is an indicator of the grease's high temperature resistance performance.
4. Oxidation stability: Lubricating grease comes into contact with oxygen during the operation of mechanical equipment, which can easily cause oxidation reactions and lead to the degradation and deterioration of the grease. Therefore, oxidation stability is an indicator reflecting the antioxidant performance of lubricating grease.
5. Copper corrosion: Copper corrosion test is an important method for evaluating the corrosion resistance of lubricating grease. Apply lubricating grease onto the copper sheet and observe the corrosion on the surface of the copper sheet at a certain temperature and time.
6. Moisture: The presence of moisture in lubricating grease can reduce its performance, therefore, oil-water separation experiments can detect the moisture content in lubricating grease.
7. Viscosity index: The viscosity index of lubricating grease is an indicator that reflects the sensitivity of changes in grease viscosity to temperature changes.