High Temperature Anti-Seize Lubricants

Threaded connections for high-temperature applications are mostly made of high-alloy steels. Because these alloys are very noble, they have almost no oxide layers that could protect them from seizure.

Lubrication is absolutely essential to avoid galling and also to prevent other joint failures such as stress corrosion cracking by elements that may be present in the lubricant. For these applications it is very important that lubricants are selected with the correct level of purity to avoid alloy damage and joint galling at high temperatures.

How to choose a high temperature grease?

When selecting a high-temperature grease, consider the following factors:

1. Determine the actual temperature range. Operating temperature may be lower than it appears. Use a contact or non-contact sensor to measure the operating temperature of the lubricant. Is it above 392ºF (200ºC)?
2. Is it intermittent or continuous? If it is continuous, look for a top-of-the-line product that meets operational requirements.
3. Do heating and cooling cycles accompany machine on and off periods? Consider whether moisture can be induced by the atmosphere or machine steam impacts
4. What is a reasonable relubrication interval or relubrication capability? If relubrication is going to be difficult, consider a top-of-the-line product for lower operating costs, even if it is more expensive.
5. Consider any cosmetic issues. Can product drip onto the part during the process? The frequency and volume of relubrication must be balanced against product contamination issues.

Types of high temperature greases :

• High Temperature Molybdenum and Graphite Grease : Used in bearings, trolley wheels, fans, film tensioner chains, etc.
• High temperature silicone grease : Resistant to the external environment.
• Copper grease : Often used in braking systems and industrial machine components.
• Perfluoropolyether (PFPE) oil based products : Used in the chemical industry, fuel and chemical tanks

By selecting the right high-temperature greases for specific applications, companies can improve equipment efficiency, reduce maintenance costs and increase overall productivity. With specially designed high-temperature greases, these problems can be solved.

Many of the advanced oils used in high temperature greases (fluorinated polyethers, perfluro polyethers, phenyl polyethers, silicones, etc.) will outlast their thickening systems.

High temperature grease applications:

• Rolling mill bearings
• Crushing and screening machines
• Roller bearings for gluing, paper converting and drying machines
• Oven grates and fire rollers for ovens
• Oven fan bearings
• Hot mix asphalt plants
• Conveyors, industrial painting lines
• Space Equipment (300 degree high temperature grease is preferred)
• Water pumps and electric motors