Understanding the Mechanism of Molykote High-Temperature Bearing Grease

In industrial environments where temperatures exceed conventional limits, maintaining stable bearing performance is a key challenge. Molykote® high-temperature bearing greases, developed by Dow, are engineered to deliver long-term protection under extreme thermal stress, ensuring smooth operation and extended component life.

1. Base Oil and Thickener Technology

Molykote high-temperature greases typically use synthetic base oils such as PAO (polyalphaolefin) or ester oils, which offer superior thermal stability and oxidation resistance compared to mineral oils.
The thickeners — commonly lithium complex, polyurea, or PTFE-based systems — provide excellent structural integrity, allowing the grease to maintain consistency even above 180 °C.

2. Anti-Oxidation and Wear Protection Mechanism

At high temperatures, oxidation is a primary cause of lubricant degradation. Molykote greases incorporate antioxidant and antiwear additives that form a protective boundary film on metal surfaces.
This film reduces direct metal-to-metal contact, minimizing friction, wear, and surface fatigue under high-load and high-speed conditions.

3. Evaporation and Stability

One of the critical challenges in high-temperature lubrication is oil evaporation. Molykote greases have a low volatility formulation, ensuring minimal oil loss and consistent lubrication film thickness during prolonged thermal exposure.
Additionally, low bleed rates prevent oil separation, preserving mechanical stability over extended operating cycles.

4. Applications

Molykote high-temperature bearing greases are widely applied in:

• Electric motor bearings

• Conveyor and oven fan bearings

• Automotive alternators

• Plastic molding equipment

• Industrial dryers and kilns

Their ability to perform under thermal cycling, oxidation, and load stress makes them an essential choice for industries seeking reliability and reduced maintenance.