1) thixotropy

Grease is the most basic characteristic is thixotropy. When a force is applied when the grease flow becomes soft, performance of viscosity reduction, but once at rest, after a period of time (short), consistency increased again (recovery), this characteristic is called thixotropy. The characteristics of the grease, it is decided that it can not be suitable for lubricating oil lubrication parts lubrication, and show its excellent performance.

2) viscosity

Grease usually with apparent viscosity or similar viscosity, the grease viscosity, temperature and shear rate must be specified. Similar viscosity index can be used to control the low temperature fluidity and pumping performance.

3) strength limit

The ultimate strength grease is the stress caused by the sample to start the flow of the required minimum cut, also known as the ultimate shear stress. Grease the ultimate strength is a function of temperature, the strength limit temperature is high fat is small and the temperature is reduced, the strength limit fat change, type and content on the thickening agent of its size, and grease conditions also have a certain relationship.

4) low temperature fluidity

One of the important indexes measure the low temperature performance of lubricating grease is low torque, i.e. at low temperature (20 DEG C) grease block low speed flow bearing rotation degree, average value of low temperature torque of grease by starting torque and rotational torque of 60MM.

5) drop point

Grease under specified conditions, the minimum temperature of liquid is called the drop point. The highest temperature dropping point of lubricating grease is helpful to the differential grease type and a rough estimate of grease, in general, for the use of soap grease, the temperature should be lower than 20~30 DEG C drop point drop point is high, its heat resistance is better.

6) evaporation

The evaporation of the grease (degrees) said the long-term use of grease under high temperature conditions, the lubricant volatile degree of evaporation, the smaller the better. The evaporation of the fat is mainly determined by the nature of the lubricating oil and the composition of the fractions.

7) colloidal stability

Colloidal stability grease grease colloid structure refers to keep stable under certain temperature and pressure, to prevent the performance of lubricating oil separated from the grease in the grease is divided oil resistance. Usually, the quantity of grease is converted into mass fraction to represent the quantity of oil. Grease colloid stability reflects grease oil and application time in long-term storage in the trend, if the colloidal stability of grease, in the role of the heat, pressure and centrifugal force easily under severe oil, resulting in life decreases rapidly, and the grease thickened dry, loss of lubrication effect.

8) oxidation stability

Oxidation stability refers to the grease used in long-term storage or long-term high temperature resistance heat and oxygen, ability to maintain its properties without permanent change. Due to oxidation, often reduce the content of free alkali or free organic acid content increased, the drop point decline, the appearance of dark colors, abnormal smell, stiffness, ultimate strength, similar to decrease viscosity, formation of corrosive products and destroy the structure of lubricating grease material, caused by the separation of oil soap. Therefore, in the long-term storage of grease, should be stored in dry and ventilated environment, prevent sun exposure, and should regularly check for changes in free base or free organic acid, corrosion and other projects, to ensure its quality and performance.