What typically characterizes a high-temperature grease?

A high-temperature grease is typically characterized by a high dropping point. The dropping point is the temperature at which a grease transitions from a semi-solid to a liquid state, which is crucial for maintaining effective lubrication under elevated temperatures. Greases with a high dropping point are formulated to withstand higher temperature environments without losing their lubricating properties, thereby providing reliable performance in applications like bearings and gears that operate at elevated temperatures.

The other characteristics mentioned do not align with what is expected from high-temperature grease. Greases with low viscosity would not perform well under high-temperature conditions, as they could easily thin out and lose their lubricating ability. High water content would generally dilute the lubricating properties and reduce the effectiveness of the grease, making it unsuitable for high-temperature applications. Lastly, low oxidation stability would lead to rapid degradation of the grease under high temperatures, resulting in increased wear and failure of the machinery. Thus, a high-temperature grease is specifically formulated to exhibit a high dropping point, ensuring its performance in demanding conditions.