What does the pour point of lubricating oil mean?

1 Answers
MacBentley
07/29/25 3:05pm
The pour point refers to the lowest temperature at which an oil sample can flow under specified test conditions when cooled; the freezing point refers to the highest temperature at which the surface of the cooled oil sample no longer moves under specified test conditions, both expressed in °C. Here is some related information: 1. Pour point: The physical significance of the pour point is one of the parameters reflecting the low-temperature fluidity of the oil. The lower the pour point, the better the low-temperature fluidity of the oil. Fuel oil has a technical indicator called the pour point, measured in °C. Generally speaking, the so-called pour point of fuel oil refers to the lowest temperature at which it can flow. 2. Freezing point of lubricating oil: The solidification of oil is quite different from that of pure compounds. Oil does not have a clear solidification temperature; the so-called "solidification" only means that the liquid surface as a whole loses fluidity. The freezing point is a quality indicator for diesel and lubricating oil that describes low-temperature fluidity. Its level is related to the chemical composition of the oil. Lighter fractions have lower freezing points, while heavier fractions and higher wax content result in higher freezing points.
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