Polyurea (Diurea) Grease Thickener
Polyurea (diurea) grease thickeners are formed in-situ by the reaction of diisocyanates with amines during grease manufacturing. The resulting non-soap thickener network provides superior high-temperature stability, with dropping points exceeding 250°C, making polyurea greases the standard choice for electric motor bearings and high-temperature industrial applications. Polyurea greases also exhibit excellent oxidative stability due to the absence of metallic soap, making them preferred in sealed-for-life bearing applications.
Technical Specifications
| NLGI grade | #1, #2, or #3 |
| dropping point | >250 °C (ASTM D566) |
| penetration (NLGI #2) | 265–295 (0.1mm) |
| operating temperature range | -30 to +180 °C |
| appearance of finished grease | Light amber to tan smooth grease |
| oxidation stability (ASTM D942) | <10 psi drop at 100h, 99°C |
Applications
- Electric motor and generator bearing greases (sealed-for-life)
- High-temperature conveyor and oven chain bearing applications
- Automotive alternator, starter motor, and water pump bearings
- Industrial spindle bearings in machine tools
- High-speed rolling element bearings requiring long service life
Key Features
- Exceptional high-temperature performance with dropping points >250°C for demanding bearing applications
- Superior oxidation resistance versus soap-based greases for extended sealed-bearing service life
- Non-toxic and halogen-free thickener chemistry compatible with food-grade applications
- Excellent structural stability prevents bleed and phase separation under centrifugal forces in high-speed applications
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