What is the dropping point of grease?

The dropping point of grease refers to the temperature at which it changes from solid to liquid when heated under specified conditions.

I. Importance of dropping point

1. Measuring heat resistance: The dropping point can reflect the heat resistance of grease. Generally speaking, the higher the dropping point, the stronger the ability of grease to maintain a stable state in a high temperature environment, and the less likely it is to flow and deteriorate.

2. Guiding the use temperature: When selecting grease, its dropping point should be higher than the highest operating temperature in actual use to ensure that the grease will not melt and flow due to excessive temperature during operation and lose its lubricating effect.

II. Factors affecting the dropping point

1. Base oil properties: Different types of base oils have different dropping points. Generally, the dropping point of synthetic base oils is relatively high, while the dropping point of mineral base oils is relatively low.

2. Types of thickeners: Thickeners have a great influence on the dropping point. For example, lithium-based greases have a high dropping point, while calcium-based greases have a relatively low dropping point.

3. Additives: Certain additives can increase the dropping point of grease and enhance its heat resistance.

III. Dropping point determination method

Generally, the method specified in the national standard is used for determination. The grease is placed in a specific container, heated at a specified heating rate, and the temperature at which the grease changes from solid to liquid is observed, which is the dropping point.