Product Description
Mobilgrease XTC is an extra high performance product designed for use in high
speed coupling applications. It is manufactured with a selected high viscosity
mineral base oil and an extremely effective, heavy-duty additive package.
Mobilgrease XTC is formulated to provide low bleed as well as high temperature
stability, properties critical to modern coupling lubrication and protection.
While the base oil provides excellent elastohydrodynamic lubrication (EHL)
film protection properties, the additive package enhances the extreme pressure
(EP) / anti-wear protection, rust and corrosion performance and the high
temperature stability of this leading edge product. Mobilgrease XTC also
incorporates proprietary formulation stability to outperform best-in-class low
bleed coupling greases with respect to high temperature stability in high
shear conditions. Mobilgrease XTC is an NLGI No. 1 lithium soap-base product.
ExxonMobil research scientists formulated Mobilgrease XTC to meet or exceed
the requirements of modern high-speed gear and grid design couplings including
the AGMA CG-2 and CG-1 specifications. This grease has shown excellent
performance and protection in a wide variety of coupling applications covering
a broad range of industries.
Based on its outstanding performance, this grease has become the product of
choice for many coupling users. Mobilgrease XTC fully meets the performance
requirements of major coupling manufacturers.
Features and Benefits:
The Mobilgrease brand of products is well known and highly regarded world-wide
based on their outstanding performance and the RandD expertise and the global
technical support that stand behind the brand. The outstanding qualities of
one of these lubricants in this family, Mobilgrease XTC, have made it the
choice of many users, especially when performance is a key concern.
Mobilgrease XTC enjoys an excellent reputation in the lubrication of high
speed and high temperature gear and grid coupling applications. Close contacts
with original equipment manufacturers (OEMs) and end-users ensure that
products such as Mobilgrease XTC will be available to meet critical
application needs, both now and in the future.
Mobilgrease XTC was specifically designed for high speed and high temperature
coupling applications, and offers the following advantages and potential
benefits:
Features
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Advantages and Potential Benefits
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Excellent resistance to oil separation
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Less leakage, better reliability and coupling protection
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Excellent EHL contribution and wear protection
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Less coupling wear, even when misaligned, and lower maintenance costs
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Excellent high temperature stability
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Long grease life and extended intervals between relubrication
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Good resistance to rust and corrosion
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Maintains excellent grease performance even in tough aqueous environments
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Applications
Application Considerations: Because Mobilgrease XTC is highly viscous and has
adhesive agents to address coupling demands, use of hand-operated grease guns
at low ambient temperatures without auxiliary heat is discouraged.
Mobilgrease XTC fully meets existing and AGMA Type CG-2 requirements for
high-speed flexible gear and grid couplings. Mobilgrease XTC also meets less
demanding AGMA Type CG-1 requirements. Mobilgrease XTC maintains its excellent
performance characteristics in ambient temperatures up to 120º C. It is not
recommended for temperatures below -30º C. Mobilgrease XTC is used widely in
industrial applications requiring the use of:
- Grid-type flexible couplings
- Gear-type flexible couplings
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Specifications and Approvals

Mobilgrease XTC meets or exceeds the following industry specifications:
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| Meets AGMA CG-1 | |
| Meets AGMA CG-2 | |
Typical Properties

Mobilgrease XTC
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|
| NLGI Grade | 1 |
| Thickener Type | Lithium/Polymer |
| Color, Visual | Dark Brown |
| Penetration, Worked, 25º C, ASTM D 217 | 325 |
| Dropping Point, ºC, ASTM D 2265 | 215 |
| Viscosity of Oil, ASTM D 445 | |
| cSt @ 40º C | 680 |
| Centrifugal Bleed, ASTM D 4425, K36, 24 hrs, 38º C, vol % | 0 |
| Penetration change, ASTM D 217, from 60X to 10,000X, mm/10 | +25 |
| Bomb Oxidation, ASTM D 942, Pressure drop at 100 hrs, kPa | 35 |
| Four- Ball Wear, ASTM D 2266 | 0.35 |
| Four- Ball EP Test, ASTM D 2596, Weld Point, Kg Load Wear Index, Kgf | 315 51 |
| Timken OK Load, ASTM D 2509, lb | 60 |
| Corrosion Prevention, ASTM D 1743 | Pass |
| Copper Strip Corrosion, ASTM D 4048 | 1A |
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Health and Safety
Based on available information, this product is not expected to produce
adverse effects on health when used for the intended application and the
recommendations provided in the Material Safety Data Sheet (MSDS) are
followed. MSDS's are available upon request through your sales contract
office, or via the Internet. This product should not be used for purposes
other than its intended use. If disposing of used product, take care to
protect the environment.
The Mobil logotype, the Pegasus are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.
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