What is the difference between the pour point (freezing point), cloud point and freezing point of the lubricating oil test?

March 11, 2024

What is the difference between the pour point (freezing point), cloud point and freezing point of the lubricating oil test?

In this cold winter, people can rely on wearing clothes, heating, air conditioning and other ways to adjust the ambient temperature, those who spend heavily purchased equipment and how to do? In low temperature environment, the equipment wants to operate normally, the selection of lubricating oil is very important.

However, for lubricating oil, low temperature is also a "challenge", especially in the particularly cold winter in the north, the low temperature performance of lubricating oil will directly affect the normal use of equipment, and even affect the service life. Just like car glass water, if the freezing point of 0℃ glass water is used in winter, in the sub-zero environment, not only can not be used, but also may cause the box to freeze and crack.

In the physical and chemical properties of oil tests, commonly used low temperature tests are: pour point (freezing point), cloud point and freezing point, what is the difference between them?

Pour point and freezing point

Pour point and freezing point are the main items of lubricating oil technical indicators, almost all lubricating oil technical indicators have pour point (or freezing point) this index, and it is the factory batch inspection project of lubricating oil.

Pour point refers to the lowest temperature at which the oil sample can continue to flow under the conditions specified in the standard. According to GB/T 3535-2006 "Method for Determination of pour point of Petroleum Products", the fluidity needs to be checked every 3 ° C.

The freezing point is the highest temperature when the oil sample is cooled to the liquid level without moving under specified conditions, which is determined in accordance with GB/T510-2018 "Method for Determination of the freezing Point of Petroleum Products".

Cloud point

Turbidity point is an important index to evaluate the low temperature fluidity of liquid petroleum products, biodiesel, biodiesel blended fuel, and is an important technical index of class II and III Base Oil.

Turbidity point is the highest temperature of clear and transparent liquid petroleum products, biodiesel, biodiesel blended fuel, etc. when they are foggy or cloudy for the first time due to the appearance of wax crystals, which is determined according to GB/T 6996-2014 "Turbidity point Determination Method for Petroleum Products".

Freezing point

Freezing point is one of the most important technical indicators of engine coolant, and it is a necessary test item for engine coolant production quality control.

The freezing point is the temperature at which the engine coolant begins to crystallize without being supercooled. Or in the case of supercooling, the coolant initially crystallized and quickly rose to the highest temperature, which was determined according to SH/T 0090-1991(2000) "Engine coolant freezing point determination Method".

The above indicators of low temperature performance detection not only provide a reference basis for the storage and transportation of products, but also provide an important reference indicator for the equipment operation to select the correct products. In addition, it should also be noted that the generally selected pour point of the lubricating oil must be 5 to 10 ° C lower than the lowest ambient temperature used by the equipment.

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