Which type of grease is recommended for use in dry conditions above 70 degrees Celsius?

The recommended choice for use in dry conditions above 70 degrees Celsius is sodium-based grease. Sodium-based greases are particularly suitable for high-temperature applications due to their thermal stability and resistance to oxidation. They maintain their consistency and performance even when exposed to heat, making them ideal for environments where temperatures exceed 70 degrees Celsius.

Sodium-based greases also tend to be water-resistant, which adds to their versatility in different operating conditions. However, it is also important to consider the specific requirements of your application, such as load, speed, and environmental exposure.

In contrast, calcium-based greases are known for their water resistance but can struggle at elevated temperatures, while lithium-based greases are more commonly used across a broader temperature range but might not perform optimally in very high temperatures compared to sodium-based varieties. Graphite-based grease is typically used for its dry-lubrication properties rather than for conventional lubrication tasks, especially at higher temperatures.