Mobil Polyrex 461 EP
Mobil Polyrex 461 EP is a shear-stable polyurea grease formulated for high-temperature, heavy-duty industrial applications. It is designed with a proprietary polyurea thickener system and extreme-pressure additives to provide excellent load-carrying capability, oxidation resistance and long service life under severe operating conditions.
One of the key advantages of Mobil Polyrex 461 EP is its excellent extreme-pressure and wear protection. The formulation includes a specialised EP additive package that provides high load-carrying capability while maintaining thermal stability, helping protect bearings and components operating under heavy loads and shock conditions.
Mobil Polyrex 461 EP also offers outstanding high-temperature performance. The grease resists oxidation and oil separation at temperatures up to approximately 170°C, helping maintain lubrication performance and extend service intervals in demanding environments.
Another important benefit is its excellent pumpability. With an NLGI 1 consistency, the grease is suitable for use in centralized lubrication systems and long distribution lines, providing reliable mobility at low temperatures and consistent delivery to lubrication points.
Mobil Polyrex 461 EP also provides strong water resistance and corrosion protection. The formulation helps keep grease in place in wet environments while protecting bearings and metal components from rust and corrosion. This makes it suitable for harsh industrial operating conditions.
The product is recommended for medium to slow speed plain and rolling bearings exposed to high temperatures, heavy loads and shock loading. Typical applications include steel mill continuous casters, wood pellet mills and equipment used in cement, glass, mining and chemical plants.
Physical characteristics include an NLGI grade 1 consistency with base oil viscosity of approximately 460 mm²/s at 40°C. Mobil Polyrex 461 EP has a dropping point of approximately 255°C and a worked penetration of approximately 325 (0.1 mm). The grease has a weld load of approximately 400 kgf in the four-ball EP test and a wear scar diameter of approximately 0.5 mm. Additional properties include water washout of approximately 1%, flow pressure of approximately 900 mbar at −20°C and a green, smooth and tacky texture, supporting reliable performance in high-temperature industrial applications.
