Mobiltac™ NC Series open-gear oils
Mobiltac™ NC Series is a high-performance, non-leaded, diluent-type, heavy-bodied lubricant designed for a wide variety of open gear marine applications. This non-chlorinated lubricant offers easy startup at low temperatures and helps support minimal equipment wear, downtime and maintenance costs. This lubricant strongly adheres to gear teeth and other machine elements to resist excessive throw-off.
This lubricant offers a range of potential benefits including:
- Helping to support minimal equipment wear, downtime and maintenance costs
- Easy start-up at low temperatures
- Superb protection in wet environments, helping reduce unanticipated downtime
- Helping provide a protective lubricating film at low temperatures
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Data Sheet
Product data sheet (PDS) 
Safety data sheet (SDS) Product Information
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Technical resources
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Learn about five different circumstances related to switching and mixing ExxonMobil marine lubricants.
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Learn more about best practices for handling, storing and dispending ExxonMobil marine lubricants
Features and Benefits
The Mobiltac NC Series of products are the most recent technology advance for the Mobiltac brand of products that have been used with great success in open gear and other mining applications for several decades. These new technology products provide significantly improved environmental and performance benefits over older diluent-type technologies. They offer the following features and potential benefits:
| Excellent protection of gear teeth and other machine elements under boundary lubrication conditions | Less equipment wear and breakdown; lower replacement, downtime and maintenance costs |
| Excellent low-temperature pumpability | Easy start-up at low ambient and avoids cost of preheating |
| Excellent resistance to water washing | Maintains superb protection in wet environments; less unanticipated downtime |
| Minimal throw-off and dripping | Less product waste and new product cost |
| No chipping or flaking at low temperatures | Maintains protective lubricating film at low temperatures |
| Easy to clean up with rags and conventional solvents or cleaning fluids | Improved safety and reduced maintenance costs |
Applications
Mobiltac 375 NC, 325 NC and Mobiltac 275NC are designed for use in a wide variety of open gear and mining applications:
- Mobiltac 375 NC, containing a high-viscosity base oil, is recommended for the lubrication of highly loaded open gears, including those that operate at high temperature, for example, ring gears on cement kilns and large gears on ore-processing mills
- Mobiltac 325 NC is recommended for the same applications as Mobiltac 375 NC. It contains more diluent and has a lower viscosity for ease of application at cooler temperatures
- Mobiltac 275 NC is designed for service as a lubricant for mine and quarry shovels, draglines, and related equipment; also open gears, racks and pinions, swing gears, booms and sticks
- Minimum operating temperature for Mobiltac 325 NC is -18 C, 375 NC is -1 C and 275 NC is -9 C
Typical Properties
| Appearance | Viscous, semi-fluid, black |
Viscous, semi-fluid, black |
Viscous, semi-fluid, black |
| Viscosity, ASTM D 445 |
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| cSt @ 40º C, with diluent | 5000 | 1500 | - |
| cSt @ 100º C, without diluent | 1260 | 1000 | - |
| Flash Point, ºC, ASTM D 92 | 135 | 110 | 150 |
| Specific Gravity, ºC kg/l, ASTM D 1298 | 0.96 | 0.95 | 0.99 |
| Maximum Temperature Use, ºC | 121 | 93 | - |
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__galvanized_wire_rope_fs_md_e.jpg)
Mobilarma™ 798 offers excellent water-displacing properties to support the lubrication and rust protection of wire rope – in extreme temperatures and for both strands and running rope.The ...
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