Polyurea Grease: Key Features and Applications

What Is Polyurea Grease?

Polyurea grease is a non-soap grease that uses a polyurea thickener to retain lubricating oil. Compared with conventional soap-thickened greases, it is widely selected for applications requiring high-temperature stability, oxidation resistance and long relubrication intervals.

Key Features of Polyurea Grease

1. Excellent High-Temperature Performance
Polyurea thickeners can maintain grease structure under elevated temperatures, making polyurea grease suitable for continuously operating bearings and other heat-generating equipment.

2. Good Oxidation Stability
Polyurea grease generally offers good resistance to oxidation, which can help extend grease service life in applications exposed to heat and continuous operation.

3. Long Service Life
Its combination of thickener stability and oxidation resistance makes polyurea grease commonly used for long-life bearing lubrication and applications where frequent relubrication is inconvenient.

4. Suitable for Electric Motors
Polyurea greases are widely used in electric motor and fan bearings. However, the specific grease should be selected according to bearing speed, temperature, load and motor manufacturer's requirements.

Common Applications

For example, Mobil Polyrex EM is a polyurea-thickened grease designed for electric motor bearing applications. Other polyurea greases are available for different temperature, load and speed requirements.

How to Select Polyurea Grease

Do not select grease only by the word “polyurea.” Check:

• Operating temperature
• Bearing speed
• Load and vibration
• Base oil viscosity
• NLGI grade
• Water exposure
• Relubrication interval
• Compatibility with the existing grease

Important: Polyurea greases are not automatically compatible with every other grease. When changing products, grease compatibility should be confirmed with the lubricant manufacturer.

Conclusion

Polyurea grease is a practical choice for high-temperature, long-life and continuously operating bearing applications, especially electric motors, fans and industrial equipment. The correct product should always be matched to the actual operating conditions and equipment requirements.