Mobil Unirex N 3 (35 lb Pail)

SKU# XOM102743

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Quick Overview

This product currently has a lead time of 10-15 business days, sometimes longer.

Mobil Unirex N 3 is an NLGI Grade 3 premium lithium complex thickened bearing grease. It is suitable for high temperature service in rolling element bearings and a variety of other industrial applications, especially electric motor bearings. Unirex N 3 meets the requirements of Lubricating Grease DIN 51825 - K3N - 20 and ISO L-XBDHA 3. The lithium complex thickener resists softening / run out of bearings at temperatures to 190°C. Laboratory bearing rig tests show outstanding continuous lubrication performance at bearing temperatures of up to 140°C.

Unirex N 3 is not intended to be used under extreme pressure (EP) conditions where extra anti-welding properties are required. It is recommended for special applications such as sealed-for-life electric motor bearings, vertically mounted bearings, and higher-speed applications where DmN (mean bearing diameter X rpm) exceeds 360,000.

Product Data Sheet

Mobil Unirex N3 Pail

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  • Mobil Unirex N3 Pail

Unirex N greases exhibit excellent high and low temperature performance, resistance to water and corrosion, and long service life in a range of bearing applications.


Advantages and Potential Benefits

Excellent high-temperature performance

Lithium-complex thickener resists softening / running out of bearings at temperatures up to 190°C

Outstanding grease life

Laboratory bearing rig tests show outstanding continuous lubrication performance at bearing temperatures of up to 140°C

Very good low-temperature characteristics

Start-up power requirements are low at temperatures down to at least -20°C and may be suitable at temperatures down to -30°C in those applications where torque is not limiting. Meets DIN 51825 low temperature torque requirements at -20°C.

Excellent mechanical stability

Exhibits excellent resistance to softening due to mechanical working

Excellent water and corrosion resistance

Resists water washout and protects bearings against corrosion

Excellent performance in high-speed applications

Channelling characteristics provide excellent performance in high- speed deep-groove ball bearings. Unirex N3 is recommended where DmN (mean bearing diameter X rpm) exceeds 360,000.


Because of their outstanding oxidation stability and resistance to softening at high temperatures, UNIREX N greases may be used in many applications such as oven-conveyor bearings, dryer-roller bearings, rotary steam joints, kiln-car bearings, induced-draft fan bearings, and equipment adjacent to high radiant heat such as ovens, soaking pits, etc.

UNIREX N 2 is an NLGI No. 2 grade and is preferred in most cases for application by hand-packing or by grease gun. UNIREX N 2 is recommended for the lubrication of electric motors. It is suitable for NEMA (National Electric Manufacturer's Association) Insulation Class A, B, and F motors.

Most of the uses for UNIREX N involve manual methods of application. Although UNIREX N 2 is suitable for use in automatic centralized systems, equipment served by these systems would normally not require the long-life properties of UNIREX N, since one of the functions of automatic systems is to replenish the lubricant at relatively short time intervals.

Regardless of the level of oxidation stability of a grease, an increase in temperature will affect the rate of oxidation and thermal deterioration. Consequently, more frequent relubrication is required at higher temperatures. For UNIREX N greases, it is recommended that relubrication intervals not exceed one week of continuous service at 175°C. As temperatures approach 190°C, relubrication intervals should be daily or every shift.  Relubrication intervals will, of course, vary widely with the type of service and should be based primarily on the recommendations of the motor manufacturer.


Unirex N Series meets or exceeds the requirements of:


DIN 51825: (2004-06)


Typical Properties



Thickener Type


NLGI Grade


Color, Visual



Smooth, Buttery

Dropping Point, ASTM D 2265, °C


Base Oil Viscosity, ASTM D 445, cSt @ 40°C


Base Oil Viscosity Index, ASTM D 2270


Penetration, worked 60 stokes, ASTM D 217, mm/10


Penetration change after 100,000 strokes, ASTM D 217, mm/10


Oil Separation, ASTM D 6184, mass % @100°C / 30 hrs


EMCOR Corrosion , ASTM D 6138 (Distilled Water), rating


Water Washout @ 79°C, ASTM D 1264, mass %


Grease life, DIN 51821 (FE-9), L50 hrs @ 140°C