1) contact degeneration

Grease is the most basic characteristics, is contact degeneration. When applied an external force, the flow of the grease in gradually become soft, apparent viscosity is reduced, but once at rest, after a period of time (very short), consistency to increase (restoration), this kind of characteristic called contact degeneration. The characteristic of grease, decided it is not suitable for parts of the lubricating oil lubrication, and show that it good performance.

2) viscosity

Grease usually use apparent viscosity or similar viscosity to represent, in that the viscosity of the grease, temperature and shear rate must be specified. Can use similar viscosity index to control the low temperature fluidity and pumping sex.

3) the ultimate strength

Grease the ultimate strength is the guide to the sample began to flow the minimum shear stress, also called ultimate shear stress. Grease ultimate strength is a function of temperature, the higher the temperature, the more fat ultimate strength is smaller, the temperature is reduced, fat ultimate strength change, it depends on the size of the thickener types and content, and system fat process conditions also have a certain relationship.

4) low temperature fluidity

Low temperature performance measure grease is one of important indicator to low temperature torque, which is, namely, in low temperature (- and ° C below) grease block low-speed flow bearing rotational degree, grease low torque by starting torque and rotation sixty mm after the average of the torque said.

5) drop point

Grease under prescribed conditions to a certain fluidity of minimum temperature is called drop point. Drop point of grease help identify grease types and roughly grease highest use of temperature, generally speaking, for soap grease, its use temperature should be lower than dropping point and ~ 30 ° C drop point is higher, the heat resistance, the better.

6) evaporative

Grease the evaporative (c) said grease in high temperature condition for a long time, when using, grease oil volatile degree, evaporative smaller may be more beautiful. Grease the evaporative mainly depends on the nature of the lubricating oil and breakup.

7) colloid stability

Grease of the colloid stability is refers to the grease in a certain temperature and pressure keep colloid structure stability, prevent oil from grease was related to the performance, also is the grease resistance grease ability. Usually the grease precipitation oil quantity reduction for the mass fraction to indicate. Grease of the colloid stability reflects the grease in long-term storage and application time oil trend, if the grease of the colloid stability is poor, is in heat, pressure, centrifugal force under the action of such as prone to identify oil, resulting in reduced quickly life, and grease thickened dry, lose lubrication.