Although drip point is a very important indicator of a grease's high temperature performance, it is by no means the only indicator. In product profiles, the "drip point" is often prominently marked on the outside, with a "drip point of 380°C" which is attractive and seems to be the legendary "high temperature grease", but the actual temperature it can reach may not even be 150°C. It may not even be enough to reach a temperature of 150°C. This article looks at the high temperature performance of greases. In higher temperature conditions it is also easy to make the evaporation loss of grease increase, oxidation deterioration and condensation and oil separation phenomenon is serious. The main reason for the failure of grease, mostly due to the shrinkage of the gel and the evaporation loss of the base oil off, that is, the grease off the efficiency of the process and the use of temperature-related.

The high temperature performance of the grease can be used at a higher temperature to maintain its adhesion performance, its deterioration failure process is also slower. The high temperature performance of grease can be evaluated by dropping point, evaporation degree and bearing leakage amount.

The dropping point of grease refers to the minimum temperature when it reaches a certain liquidity under the specified conditions, expressed in ℃. The dropping point has no absolute physical significance, its value varies with the heating rate of the equipment.

The dropping point of grease mainly depends on the type and content of thickening agent, the dropping point of grease can roughly reflect the upper limit of its use temperature. Obviously, when the grease reaches the dropping point it has lost its ability to adhere to the metal surface. Generally speaking, grease should be in the drop point below 20 ℃ a 30 ℃ or lower temperature conditions. Usually, grease with a high dropping point has a relatively high temperature, but the actual temperature of grease is generally 30°C to 50°C below the dropping point. The key to high temperature grease resistance is the choice of base oil, which plays a decisive role in the high and low temperature performance of the grease. In addition to this, there is a relationship with the way the grease is thickened and the content of the additive type.

The choice of high temperature grease should not be based on the drop point, but on how to choose a good grease for your equipment. Don't think that "the higher the temperature the safer the grease" or "high drop point is high temperature resistant".

After reading this article on the high temperature performance of grease, I hope it will help you.