What is POLYLUB GLY 801?
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What is POLYLUB GLY 801?
POLYLUB GLY 801 is a multi-purpose lithium soap grease manufactured by KLÜBER, formulated with a mineral base oil and enhanced with molybdenum disulfide (MoS₂) solid lubricant additives. This combination produces a grease that handles heavy-duty applications across multiple industries while remaining cost-effective for high-volume consumption. KLÜBER developed this product to serve as a dependable, general-purpose lubricant that maintenance teams can rely on for everyday bearing and chassis lubrication tasks.
The NLGI 2 consistency grade places POLYLUB GLY 801 in the most widely specified grease category for industrial bearings, balancing pumpability with mechanical stability. Its lithium soap thickener stays in place within bearing housings and resists being thrown out under centrifugal force. The MoS₂ additive serves as a sacrificial layer between metal surfaces, reducing friction and preventing adhesive wear when loads exceed the film strength of the base oil alone—a valuable characteristic in construction and agricultural equipment that experiences shock loading and oscillating motion. The brown-to-dark-brown appearance is characteristic of greases containing molybdenum disulfide and serves as a visual indicator of the solid lubricant content.
Technical Profile
| Property | Value |
|---|---|
| Base Oil | Mineral oil |
| Thickener Type | Lithium soap |
| NLGI Grade | NLGI 2 |
| Operating Temperature Range | -30°C to +120°C |
| Color | Brown to dark brown |
| Certifications | None |
The mineral base oil provides adequate film strength for moderate-speed, moderate-load conditions typical of general industrial and mobile equipment bearings, with natural metal affinity contributing to the grease’s adhesion. The lithium soap thickener—the workhorse of the grease industry—offers mechanical stability, water resistance, and a stable matrix that holds and releases oil at predictable rates, plus broad compatibility with other lithium greases when mixed during relubrication. The -30°C lower limit reflects adequate low-temperature flow for temperate and moderate winter conditions, while the 120°C upper limit is set by mineral oil oxidation stability and lithium soap thermal degradation. Near the upper limit, relubrication intervals should be shortened. The absence of formal certifications positions this product for applications where specific OEM approvals or food-grade registrations are not mandatory.
Applications
POLYLUB GLY 801 is engineered for broad versatility across mobile and stationary machinery, with particular strength in environments where heavy loads, moderate speeds, and exposure to moisture are everyday conditions.
Vehicle Chassis and Plain Bearings. The MoS₂ content suits chassis lubrication points on trucks, buses, and off-highway vehicles. Shackle pins, king pins, fifth-wheel plates, and spring hangers benefit from the solid lubricant’s ability to maintain a separating film under high contact pressures and low-speed sliding motion. Plain bearings with oscillating motion also gain from EP protection during start-up when hydrodynamic oil films have not yet formed.
Construction Machinery. Excavators, bulldozers, wheel loaders, graders, and backhoes operate in dusty, wet, high-impact environments. POLYLUB GLY 801 delivers the load-carrying capacity needed for pivot pins, bucket linkages, slew bearings, and undercarriage components. Good metal adhesion keeps lubricant in place despite vibration, washout, and constant jolting. The corrosion protection package defends against rust on exposed wear surfaces.
Agricultural Equipment. Tractors, combines, balers, tillage implements, and harvesting machinery share the harsh operating profile of construction equipment with the added challenge of long seasonal duty cycles. The affordability of POLYLUB GLY 801 is meaningful in agriculture, where large machines have numerous grease points requiring frequent replenishment. Disc harrow bearings, PTO shaft universal joints, and implement pivot points all respond well to lithium grease with MoS₂ fortification.
General Industrial Bearings. Conveyor rollers, fan bearings, pump bearings, mixer shafts, and electric motor bearings at moderate speeds and temperatures are all within the grease’s working range. The NLGI 2 consistency suits most industrial rolling-element bearing applications, and the lithium thickener provides the mechanical stability needed for continuous-duty equipment.
Conveyor Bearings. Both gravity and powered roller conveyors in material handling, packaging lines, and bulk transport depend on reliable bearing lubrication. POLYLUB GLY 801 helps prevent brinelling and false-brinelling damage that occurs when conveyor bearings sit idle under vibration or undergo reciprocating micro-motion. Its economical pricing makes it practical for facilities operating extensive conveyor networks with hundreds of lubrication points.
Advantages & Limitations
Advantages
MoS₂ Fortification for Heavy Loads. The molybdenum disulfide solid lubricant provides a low-shear separating layer effective even when the base oil film is squeezed out under extreme pressure or shock loading. The MoS₂ platelets align under shear to reduce friction in boundary and mixed-film lubrication regimes, extending the load-carrying range beyond a plain lithium grease.
Reliable EP Protection. The extreme-pressure additive package works in concert with MoS₂ to prevent scuffing, galling, and adhesive wear in heavily loaded contacts. This dual EP mechanism—chemical reaction layers plus physical solid lubricant platelets—covers a range from slow-speed high-torque joints to moderate-speed rolling-element bearings.
Wide Application Versatility. A single product covering chassis lubrication, plain bearings, rolling-element bearings, and general industrial grease points reduces inventory complexity and misapplication risk. Maintenance teams can consolidate grease inventory around one product for most lubrication points, simplifying procurement, storage, and training.
Strong Metal Adhesion. The grease resists being thrown off rotating components and clings to vertical and overhead surfaces, preventing dry starts after extended idle periods. This tackiness, combined with water-resistant lithium thickener, helps the grease persist through rain, splash, and washdown exposure.
Cost-Effective for High-Volume Use. The mineral oil base and lithium soap chemistry are among the most economical grease components, positioning POLYLUB GLY 801 as an affordable option for operations consuming large quantities across many lubrication points. Fleet operators, agricultural enterprises, and construction companies achieve adequate performance without overspending on specialized greases.
Good Corrosion Protection. Rust and corrosion inhibitors protect ferrous metal surfaces from moisture-induced oxidation—important for outdoor equipment exposed to rain and humidity, as well as indoor applications where washdown procedures create persistently damp conditions around bearings.
Long-Established Product History. POLYLUB GLY 801 benefits from an extended track record in the field, giving maintenance engineers confidence in its consistency. Years of proven performance across diverse industries reduces the technical risk of introducing a new lubricant into established maintenance programs.
Limitations
Not Food Grade. This product carries no food-grade certifications and is unsuitable for applications where incidental food contact is possible. Food, beverage, and pharmaceutical facilities must select greases with appropriate NSF H1 or equivalent registrations for lubrication points near product zones.
Maximum Temperature of 120°C. The upper operating limit restricts use in oven bearings, kiln car bearings, hot fans, and equipment near furnaces or steam lines. Near the 120°C mark, relubrication frequency must increase significantly, and the grease should not be specified where prolonged high-temperature exposure is expected.
Mineral Oil Oxidation Life. Mineral base oils oxidize more rapidly than synthetic hydrocarbons or esters, particularly at elevated temperatures. In applications running continuously near the upper temperature limit, the oil will thicken, form varnish deposits, and lose lubricating properties over a shorter service interval than a comparable synthetic grease. This must be factored into relubrication scheduling and bearing life calculations.
Not for High-Speed Precision Bearings. The consistency and solid lubricant content make POLYLUB GLY 801 unsuitable for precision spindle bearings, high-speed electric motor bearings, and instrument bearings where churning losses, heat generation, and vibration from solid particles would compromise performance. High-speed applications demand greases with lower base oil viscosity and channeling characteristics optimized for minimal drag.
MoS₂ Discoloration. The dark gray-to-black color from molybdenum disulfide can stain surrounding components, machine frames, and operator clothing. The discoloration is an inherent characteristic of the MoS₂ additive and does not indicate degradation; it remains visible throughout the product’s service life.
Chemical Compatibility Constraints. The lithium thickener and mineral base oil are not designed for chemically aggressive environments involving strong acids, alkalis, solvents, or oxidizing agents—these can break down the thickener structure or react with the additive package. Equipment exposed to chemical splash or fumes should be evaluated for compatibility before specifying this grease.
Maintenance
Proper maintenance practices maximize the service life of both the grease and the equipment it protects. Before applying POLYLUB GLY 801, clean each grease fitting with a lint-free cloth to prevent dirt and grit from being forced into the bearing. Contamination is a leading cause of premature bearing failure, and even small amounts of abrasive particles introduced during relubrication can dramatically shorten component life.
Pump fresh grease slowly and steadily through each fitting, observing the expelled old grease at the seal or relief port. Continue until the purged grease appears clean and consistent in color, indicating full displacement of old, contaminated lubricant. Avoid over-greasing—particularly in electric motor bearings and sealed housings—as excess grease causes churning, elevated temperatures, and accelerated oxidation. As a rule, fill the bearing cavity to roughly one-third to one-half of its free volume, leaving room for thermal expansion and grease movement.
Establish a relubrication schedule based on operating conditions rather than calendar time alone. Bearings at higher speeds, higher temperatures, or in contaminated environments need more frequent service than those in clean, cool, slow-speed applications. Monitor bearing housing temperatures periodically; a rising trend often indicates relubrication is overdue or the grease is near the end of its service life. Document relubrication dates, quantities, and observations to build a maintenance history that supports data-driven interval optimization.
When switching to POLYLUB GLY 801 from a different grease, consider thickener compatibility. Lithium greases are generally compatible with other lithium greases, but mixing with incompatible types—such as some clay, polyurea, or calcium complex greases—can cause excessive softening or hardening. If the existing grease type is unknown, purge thoroughly during the first relubrication and monitor bearing temperatures for incompatibility signs. In critical applications, consult the previous grease manufacturer’s compatibility data before making the switch.
FAQ
A: MoS₂ is a solid lubricant that forms a low-friction layer between metal surfaces. When loads are heavy enough to squeeze out the oil film—such as during shock loading, start-up, or slow-speed oscillating motion—the MoS₂ platelets shear easily to maintain separation and prevent metal-to-metal contact, providing wear protection beyond what the base oil and EP additives alone offer.
A: Yes, provided the system is designed for an NLGI 2 grease and the pump, lines, and metering valves are sized appropriately. For progressive systems with small-diameter feed lines or long distribution runs, verify that the system can maintain adequate pressure, especially at cold-start temperatures approaching the -30°C lower limit.
A: POLYLUB GLY 801 can be used in wheel bearings for moderate-speed vehicles within the -30°C to +120°C range. For high-speed, long-distance highway operation where brake heat may elevate bearing temperatures, a grease with a higher temperature rating or synthetic base oil provides a larger safety margin. Always consult the vehicle manufacturer’s specification before selecting a wheel bearing lubricant.
A: The lithium soap thickener provides good water resistance, and the corrosion inhibitors protect metal surfaces against moisture-induced rust. The grease adheres well to metal, remaining in place despite water spray or splash. In heavily flooded conditions, a grease with enhanced washout resistance may offer longer retention, but for rain-exposed outdoor equipment and occasional washdown, POLYLUB GLY 801 performs reliably when relubrication intervals are maintained.
A: When stored in its original sealed container in a cool, dry, indoor location away from direct sunlight, POLYLUB GLY 801 typically has a shelf life of approximately three to five years from the date of manufacture. Keep containers closed when not in use to prevent dust and moisture contamination. Avoid storing cartridges and pails directly on concrete floors where temperature fluctuations cause condensation. Use oldest stock first and maintain proper inventory rotation.
Availability
POLYLUB GLY 801 is available through KOEED, an authorized distributor of KLÜBER lubrication products. For pricing, packaging options, technical consultation, or to place an order, contact the KOEED team at Moritta@KOEED.COM. The KOEED technical support staff can assist with application assessments, compatibility questions, and lubrication program optimization to help you achieve reliable equipment performance with this multi-purpose lithium grease.