The grease has hardened. Is it necessary to add some oil?
After most of the grease has been stored for a period of time, the consistency may increase, which is what is said to be "hard". In fact, even if the grease appears to be hard, the normal use is no problem under the premise that the consistency does not increase much. If the consistency changes greatly, it means that the base oil is separated too much. During use, the frictional resistance of the mechanical parts is increased and the mechanical power consumption is increased, so it cannot be used directly.
Some users add base oil to the hardened grease to dilute it. Some repairers prefer to add lubricating oil to the grease when using grease in winter. This approach is wrong. Because the structure of the grease consists of a colloidal structure system composed of a thickener and a base oil, the thickener forms a structural network, and the base oil is adsorbed in the network to form a stable structural system, and the thickener and the base oil are not separated. If the base oil is added after the fat is formed, although it is stirred, the lubricating oil cannot be uniformly dispersed into the network due to the lack of the necessary homogenization treatment process, the colloidal stability of the grease is deteriorated, and the oil separation is increased. Will affect the effect of use.
Grease that has thickened, when other physical and chemical properties change little, the same base oil can be added to the production plant, and after normalization process and analysis and testing, it can be used normally.