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Description
Mobil Polyrex EM 103 Grease (NLGI 3)Industrial Grease Manufacturing All Mobil Lubricants Mobil Polyrex Series Electric Motor Bearing Grease Mobil Polyrex EM 103 Electric Motor Bearing Grease NLGI 3 Polyurea Thickener Vertical Mount & Large Motors NLGI 3 POLYUREA 270C Dropping Point Vertical Mount Bearings Large Frame Motors Stiffer Consistency Engineered for Vertical Mounts & Large Motors Mobil Polyrex EM 103 is the NLGI 3 grade in the Polyrex EM Series, providing the same super premium
Stiffer Consistency — Engineered for Vertical Mounts & Large Motors
Mobil Polyrex EM 103 is the NLGI 3 grade in the Polyrex EM Series, providing the same super-premium polyurea formulation as Polyrex EM in a firmer consistency specifically recommended for vertically mounted bearings, or very large motors where OEM specifications call for a stiffer grease.
The Polyrex EM Series was specifically engineered to solve the failure modes that conventional greases suffer in electric motor applications — and EM 103's stiffer consistency was developed for the specific problem of grease slumping and migration in vertical bearing housings, where a softer grade would run out under gravity and leave the bearing under-lubricated. For South African manufacturing and processing facilities running large or vertically mounted motors, Polyrex EM 103 is the correct choice where bearing fill retention and long-term reliability are the priority.
Product Overview
Mobil Polyrex™ EM 103 is a super-premium electric motor bearing grease formulated with an advanced polyurea thickener and proprietary manufacturing techniques — delivering improved bearing performance and protection for long electric motor life. The NLGI 3 consistency is specifically recommended for applications such as vertically mounted bearings, or very large motors where a stiffer grease consistency may be required by the OEM.
The advanced polyurea thickener provides increased durability versus conventional polyurea greases when subjected to mechanical shear forces — maintaining grease structure and bearing protection over the full service interval. Mobil Polyrex EM 103 also delivers excellent corrosion resistance and superior oil separation and water washout resistance compared to standard Polyrex EM, making it particularly well suited to large-frame motors operating in demanding industrial environments.
Mobil Polyrex EM 103 is compatible with a number of ExxonMobil lithium complex greases and competitive electric motor mineral polyurea products, as determined by ASTM D6185 methodology. Available in 18kg pail and 180kg drum from Orbit Industrial — distributing Mobil lubricants across the Western Cape, Northern Cape and Garden Route.
Why NLGI 3 Matters for Vertical Mounts & Large Motors
The case for a stiffer NLGI 3 grease is stronger in vertical bearing and large motor applications than in standard horizontal motor installations — because the consequences of using the wrong consistency are uniquely costly:
Grease Migration — The Primary Failure Mode
In vertically mounted bearings, softer NLGI 2 greases can slump and migrate downward under gravity over time, leaving the upper bearing race under-lubricated. The stiffer NLGI 3 consistency of Polyrex EM 103 resists this migration and maintains correct bearing fill throughout the service interval.
Superior Oil Separation Resistance
Oil separation of just 0.1 mass% — meaningfully lower than standard Polyrex EM's 0.5% — reducing oil bleed and maintaining consistent lubrication in large-frame and high-temperature motor applications.
Excellent Water Washout Resistance
Water washout loss of just 0.8 wt% provides strong resistance to grease loss in humid or wash-down industrial environments where bearing housings are exposed to moisture.
OEM Compliance for Large Motors
Many large-frame electric motor OEMs specify a firmer NLGI 3 grease for the higher loads and bearing geometries common in large industrial drive motors — Polyrex EM 103 meets this requirement directly.
Full Performance Benefits
Stiffer Consistency for Demanding Mounts
The NLGI 3 grade resists slumping and migration in vertically mounted bearings, holding its structure where a softer NLGI 2 grease would run out of the bearing housing under gravity.
Advanced Polyurea Thickener
Increased durability versus conventional polyurea greases when subjected to mechanical shear forces — maintaining grease structure and bearing protection over the full service interval.
Outstanding Grease Life
750+ hours of lubrication life at 177°C allows significantly extended re-lubrication intervals — reducing maintenance frequency and labour cost across large electric motor populations.
Excellent Corrosion Resistance
Provides protection against rust and corrosion for bearing surfaces in humid and demanding industrial environments — protecting large-frame motor bearings from premature corrosion-related wear.
Excellent Low-Temperature Performance
Maintains bearing protection down to -29°C, ensuring reliable lubrication and motor start-up performance in cold storage, refrigeration and outdoor industrial environments.
Broad OEM Compatibility
Recommended for vertically mounted bearings and large-frame motors across major bearing and electric motor manufacturer specifications — simplifying procurement for large industrial drive applications.
Recommended Applications
Note on marine and coastal use: Mobil Polyrex EM 103 provides slightly less protection under mild salt-water wash conditions than standard Mobil Polyrex EM. For coastal or marine motor applications, confirm the correct grade with our technical team before specifying.
Polyrex EM 103 vs Polyrex EM — Grade Selection
Always confirm the correct grade and consistency from your motor OEM service manual before ordering. Contact Orbit Industrial for grease selection assistance.
Technical Properties
| Property | Test Method | Value |
|---|---|---|
| Grade | — | NLGI 3 |
| Thickener Type | — | Polyurea |
| Colour, Visual | — | Blue |
| Dropping Point | ASTM D2265 | 270°C |
| Penetration, 60X | ASTM D217 | 250 (0.1mm) |
| Penetration Change, 60X–100,000X | ASTM D217 | 40 (0.1mm) |
| Four-Ball Wear Test, Scar Diameter | ASTM D2266 | 0.6mm |
| Lubrication Life @ 177°C | ASTM D3336 | 750+ hrs |
| Oil Separation, 0.25 psi, 24h @ 25°C | ASTM D1742 | 0.1 mass% |
| Water Washout, Loss @ 79°C | ASTM D1264 | 0.8 wt% |
| Copper Strip Corrosion, 24h @ 100°C | ASTM D4048 | 1A |
| Corrosion Preventive Properties | ASTM D1743 | Pass |
| SKF Emcor Rust Test, 10% Synthetic Sea Water | ASTM D6138 | 0, 1 |
| Low Temp Torque, Running, -29°C | ASTM D1478 | 910 g-cm |
| Low Temp Torque, Starting, -29°C | ASTM D1478 | 5840 g-cm |
| Base Oil Viscosity @ 40°C | ASTM D445 | 115 mm²/s |
| Base Oil Viscosity @ 100°C | ASTM D445 | 12.2 mm²/s |
| Viscosity Index | ASTM D2270 | 95 |
Typical properties — not guaranteed specifications. Source: ExxonMobil Product Data Sheet, August 2025.
Pack Sizes & Procurement
Available Pack Sizes
16kg Pail
Workshop & plant supply
Orbit Industrial supplies Mobil Polyrex EM 103 electric motor grease to manufacturing, processing and facilities operations across the Western Cape, Northern Cape, Garden Route and Gauteng. Request a bulk quote →
Technical Documentation
Mobil Polyrex™ EM Series — Technical Datasheet
Electric motor bearing grease series · Orbit Industrial
For Safety Data Sheet (SDS) visit msds.exxonmobil.com →
Orbit Industrial Supplies distributes genuine Mobil Polyrex electric motor greases to manufacturing, processing and industrial operations across South Africa. Mobil Polyrex EM (NLGI 2) → · Full grease range → · Request a quote →
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy