The role of grease is mainly to lubricate, protect and seal. Grease works on the principle that the thickener keeps the oil where it needs to be lubricated, and when there is a load, the thickener releases the oil to lubricate. The same car also needs to use grease, then let's take a look at the performance indicators of the use of car grease?

　　According to the working standard of grease location for cars, the basic requirements for automotive grease: moderate consistency, excellent temperature resistance, water resistance, wear resistance, anti-rust treatment, anti-corrosion and colloidal stability, etc. .

　　1. Low temperature characteristics

　　For cars used in severe cold regions, the specified grease can still maintain stable lubricating performance. The index values for identifying the low temperature characteristics of automotive greases are similar viscosity and low temperature torque.

　　Similar viscosity refers to the ratio of shear stress to shear rate when automotive grease flows at a certain temperature and a certain shear rate, and generally decreases as the temperature increases. Since similar viscosities of greases are predicated on two fixed criteria of temperature and shear rate, these two necessary conditions should be indicated for similar viscosities.

　　The low temperature torque indicates the degree of conduction retardation of the rotation of the low-speed rolling bearing when the automotive grease is applied under the low temperature standard. Generally, the minimum temperature when the rolling bearing rotates once in 1min is measured with the torque of 9.8N cm. Minimum application temperature.

　　2. High temperature characteristics

　　Temperature has a great influence on the fluidity of automotive grease. As the temperature rises, the grease becomes loose, which reduces the adhesion characteristics of the grease and facilitates the outflow. In addition, it is easy to expand the volatilization damage of grease, air oxidation mildew and oil separation under higher temperature standards. Automotive greases with good high temperature properties can maintain their adhesion characteristics at higher application temperatures, and the whole process of mildew ineffectiveness is also slower.

　　3. Consistency

　　Consistency refers to the degree to which a plastic substance like grease resists deformation when subjected to force. Consistency is a characteristic of plasticity, a vague definition that reflects the deformation and flow frictional resistance of automotive greases.

　　The identification index value of the consistency of automotive grease is the penetration, which is generally measured with a penetration meter. The larger the penetration value, the weaker the structural force of the grease management system, that is, the smaller the consistency, the easier it is to deform and flow.

　　4. Corrosion resistance

　　The corrosion resistance of automotive grease refers to the characteristics of grease to avoid rusting and corrosion of parts. It is generally identified by anti-corrosion experiments, corrosion experiments, and measurement of dispersed alkali and dispersed organic acid.

　　5. Colloidal stability

　　Colloidal stability refers to the ability of automotive grease to resist the influence of temperature and working pressure to maintain the colloidal structure, that is, the reliability of the combination of base oil and thickener.

　　6. Mechanical stability

　　Mechanical stability refers to the working ability of automotive grease to resist the change of mortar consistency under the standard of mechanical work. The key lies in the compressive strength of the thickener chemical fiber itself, the attractiveness of point contact between chemical fibers and the amount of thickener. Vehicle grease with poor mechanical stability is very easy to thin or even flow out when applied, which affects the service life of the grease.

　　7. Water-resistant

　　The water resistance of automotive greases refers to the grease's ability to resist changes in construction and mortar consistency when exposed to water. When grease absorbs moisture, it melts the thickener and reduces the dropping point, causing corrosion and reducing maintenance efficiency.