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Eight major properties of Petrolube's grease (on)
2015/1/23
Thixotropy
The most basic characteristic of Petrolube grease is thixotropy. When an external force is applied, the flow of Petrolube's grease is gradually softening and the viscosity is reduced, but once it is at rest, after a period of time (very short), the consistency increases (recovers) again. This characteristic is called thixotropic. . This property of Petrolube's grease determines its ability to lubricate in areas that are not suitable for lubricating oils, while demonstrating its excellent performance.
2. Viscosity
Petrolube greases are usually expressed in terms of apparent viscosity or similar viscosity. When describing the viscosity of Petrolube grease, the temperature and shear rate must be specified. Similar viscosity indicators can be used to control its low temperature fluidity and pumpability.
3. Strength limit
The strength limit of Petrolube grease is the minimum shear stress required to cause the sample to begin to flow, also known as the ultimate shear stress. Petrolube's grease strength limit is a function of temperature. The higher the temperature, the lower the strength limit of the fat, the lower the temperature, the greater the strength limit of the fat, the size of which depends on the type and content of the thickener, and the process conditions of the fat-making process. There is also a certain relationship.
4. Low temperature fluidity
One of the important indicators to measure the low temperature performance of Petrolube's grease is the low temperature torque, that is, the degree of rotation of Petrolube's grease blocking low speed flow bearing at low temperature (below -20 °C), the low temperature of Petrolube grease The torque is represented by the starting torque and the average of the torque after 60 rpm.
5. Dropping point
The lowest temperature at which Petrolube grease reaches a certain fluidity under specified conditions is called the dropping point. The drop point of Petrolube's grease helps to identify the type of Petrolube grease and the roughest estimate of the maximum temperature of Petrolube's grease. In general, for soap bases, the temperature should be lower than the drop point 20~ The higher the dropping point at 30 ° C, the better the heat resistance.
The most basic characteristic of Petrolube grease is thixotropy. When an external force is applied, the flow of Petrolube's grease is gradually softening and the viscosity is reduced, but once it is at rest, after a period of time (very short), the consistency increases (recovers) again. This characteristic is called thixotropic. . This property of Petrolube's grease determines its ability to lubricate in areas that are not suitable for lubricating oils, while demonstrating its excellent performance.
2. Viscosity
Petrolube greases are usually expressed in terms of apparent viscosity or similar viscosity. When describing the viscosity of Petrolube grease, the temperature and shear rate must be specified. Similar viscosity indicators can be used to control its low temperature fluidity and pumpability.
3. Strength limit
The strength limit of Petrolube grease is the minimum shear stress required to cause the sample to begin to flow, also known as the ultimate shear stress. Petrolube's grease strength limit is a function of temperature. The higher the temperature, the lower the strength limit of the fat, the lower the temperature, the greater the strength limit of the fat, the size of which depends on the type and content of the thickener, and the process conditions of the fat-making process. There is also a certain relationship.
4. Low temperature fluidity
One of the important indicators to measure the low temperature performance of Petrolube's grease is the low temperature torque, that is, the degree of rotation of Petrolube's grease blocking low speed flow bearing at low temperature (below -20 °C), the low temperature of Petrolube grease The torque is represented by the starting torque and the average of the torque after 60 rpm.
5. Dropping point
The lowest temperature at which Petrolube grease reaches a certain fluidity under specified conditions is called the dropping point. The drop point of Petrolube's grease helps to identify the type of Petrolube grease and the roughest estimate of the maximum temperature of Petrolube's grease. In general, for soap bases, the temperature should be lower than the drop point 20~ The higher the dropping point at 30 ° C, the better the heat resistance.
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