When we use grease, equipment cannot be effectively protected due to improper storage or prolonged use. So, what causes the bearing grease to fail? It is helpful for our daily maintenance of grease. The following is Jiurun's analysis of the reasons for the failure of lubricating grease:

　　1. Failure caused by physical factors

　　During use, the grease will be subjected to mechanical shearing and centrifugal force at the same time, and the grease will be thrown out of the friction interface to separate the grease, resulting in a decrease in oil content and a decrease in cone penetration and hardening, and the grease will completely fail to a certain extent; Under the action of mechanical shearing, the structure of the oil is destroyed (such as the detachment or orientation of soap fibers), resulting in its softening, decrease in consistency, increase in oil content, and ultimately failure. Under normal conditions, if the conveying speed is increased by 2000 rpm, the service life of the grease will be shortened by about half. Under high shear stress, the speed is doubled and the service life is only 1/10 of the original.

　　2. Failure caused by chemical factors

　　Bearing grease chemically reacts with oxygen in the air to produce acidic substances that first consume the antioxidant additives in the grease. However, the generated organic acid will corrode the metal components to a certain extent, destroy the structure of the oil, reduce its dropping point, increase the viscosity of the base oil, and make its fluidity worse. Extensive tests have shown that the higher the temperature, the more obvious the decline in grease life. For example, when the temperature is 90~100℃, the grease life is halved every 19℃, and when the temperature is 10~150℃, the grease life is halved every 15℃.

　　In addition, moisture, dust and harmful gases in the environment where bearing grease is used are also important factors in the deterioration of the grease. For example, copper, iron, lead, bronze and other wear particles are mixed into the grease, which will catalyze the oxidation of the grease. In short, there are many reasons for the failure of grease, and sometimes it may be caused by one reason, but most of them are the result of a combination of factors, or one reason is the breakthrough, and then the result of the combination of other reasons.