The first drop point: that the grease is heated to a certain extent began to drop the first drops of temperature, it marks the grease heat capacity, maximum working temperature of various lubricating grease should be 20~300C. lower than the drop point。

    Second cone penetration: at a certain temperature, certain weight with conical hammer into the grease inside 5S for cone penetration depth, the lubricating grease. It said grease sticky degree. Cone penetration of lubricating grease is too small, that is too hard, and not easy to completely fill the friction surface; cone penetration through the large, illustrate the grease is too soft, and prone to leakage.