Grease plays a pivotal role in the maintenance and longevity of machinery across various industries. Understanding the different types of grease and their specific applications is essential for selecting the right lubricant to ensure optimal performance and durability.
What Is Grease?
Grease is a semi-solid lubricant composed of a base oil, a thickening agent, and additives. The base oil provides the lubricating properties, the thickener gives the grease its consistency, and additives enhance performance characteristics such as oxidation resistance, corrosion protection, and extreme pressure capabilities.
Common Types of Grease
1. Lithium-Based Grease
Composition : Formulated by thickening mineral or synthetic oils with lithium soap.
Properties
- Excellent mechanical stability.
- Good water resistance.
Use when
- Steel mill continuous casters
- Paper machi
- Used in automotive and industrial machinery for bearings, chassis, and general-purpose lubrication.
| Parameter | Value |
|---|---|
| Dropping Point | 260–300°C |
| Max Continuous Service | 180°C |
| Water Resistance | Good (ASTM D1264: 3–8% loss) |
| Compatibility | ✅ Simple Lithium · ⚠️ Calcium Sulfonate · ❌ Polyurea |
| NLGI Grades | 1, 2, 3 |
Positioning InsightThe correct first upgrade when simple lithium runs out of temperature headroom. Unit cost is 20–30% higher than simple lithium; the upgrade is justified when relubrication intervals drop below 50% of OEM specification at operating temperature.
For a full breakdown of lithium grease chemistry, NLGI grade selection, and product specifications, see our complete lithium grease guide.
2. Calcium-Based Grease
Composition : Formulated by thickening mineral oils with calcium soap.
Properties
- Good water resistance.
- Effective in low-temperature environments.
- Less stable at higher temperatures.
- Excellent water resistance and adhesion (ASTM D1264: typically <10% washout loss)
- Good corrosion protection in wet environments
- Reliable low-temperature pumpability
- Limited high-temperature stability due to low dropping point
Use when
- Marine equipment
- Agricultural machinery
- Low-speed, water-exposed bearings
- Open gears in humid environments
| Parameter | Value |
|---|---|
| Dropping Point | 90–105°C (hydrated) · up to ~175–220°F / 80–105°C typical (Alibaba) |
| Max Continuous Service | ~60–70°C (practical limit ~50°C below dropping point) |
| Water Resistance | Excellent (ASTM D1264: typically <10% loss) |
| Load Capacity | Moderate (not suitable for heavy shock loads) (Alibaba) |
| Compatibility | ❌ Lithium · ❌ Polyurea · ⚠️ Limited cross-compatibility (risk of softening/hardening) |
| NLGI Grades | 1, 2 (most common), 3 |
Positioning InsightThe lowest-cost solution for wet environments where temperature remains below ~70°C. Performance failure is driven by thermal collapse—not water washout—making it unsuitable once operating temperatures exceed basic ambient-industrial ranges.
For a full breakdown of calcium grease chemistry, NLGI grade selection, and application limits versus lithium and calcium sulfonate systems, see our complete calcium grease guide.
3. Aluminum Complex Grease
Composition : Created by thickening mineral oils with aluminum soap.
Properties
- High-temperature stability.
- Excellent water resistance.
- Good shear stability.
Use when
- Ideal for high-temperature applications such as ovens, kilns, and steel mills.
| Parameter | Value |
|---|---|
| Dropping Point | 250°C+ |
| Metal Adhesion | Excellent — film reattaches after shear |
| Water Resistance | Good |
| Compatibility | ⚠️ Generally incompatible with lithium |
Positioning InsightAluminum complex grease flings off and reattaches. In open gear drives, wire rope, and conveyor chains — where conventional greases centrifuge away from the contact zone — film retention is the primary challenge. For those three applications, aluminum complex is the standard specification.
For a full breakdown of Aluminum Complex Grease, NLGI grade selection, and application limits versus lithium and calcium sulfonate systems, see our complete calcium grease guide.
4. Barium Complex Grease
Composition:Formulated by thickening mineral oils with barium soap.
Properties
- Excellent mechanical stability and load-carrying capacity under heavy-duty conditions
- High dropping point and strong thermal resistance (typically >220°C)
- Outstanding resistance to water washout and chemical exposure (acids, alkalis, solvents)
- Good anti-wear and extreme pressure (EP) performance
Use when
- Aeronautical systems
- Marine environments
- Chemical processing equipment
- Heavy-load industrial bearings (e.g., rolling mills, conveyors)
| Parameter | Value |
|---|---|
| Dropping Point | ~220–260°C (barium complex typical) |
| Max Continuous Service | ~150–180°C (rule: ~50°C below dropping point) |
| Water Resistance | Excellent (ASTM D1264: <2–5% loss typical) |
| Load Capacity | High (EP-capable, suitable for heavy loads) (IKV Lubricants) |
| Chemical Resistance | Excellent (resistant to acids, alkalis, solvents) (HJ OIL GROUP) |
| Compatibility | ❌ Lithium · ❌ Polyurea · ⚠️ Limited compatibility (risk of structure breakdown) |
| NLGI Grades | 1, 2, 3 |
Positioning InsightA high-performance option for harsh conditions involving heavy load, water, and chemicals. It has mostly been replaced by calcium sulfonate and lithium complex greases in modern applications.
For a full breakdown, see our complete barium grease guide for chemistry, limits, and modern alternatives.
5. Polyurea Grease
Composition : Synthesized by reacting polyisocyanate with amines, resulting in a non-soap thickener.
Properties
- High-temperature stability.
- Excellent water resistance.
- Oxidation stability.
Use when
- IE3 / IE4 high-efficiency motors
- Sealed-for-life bearings
- Electric motor bearings
- Water pump bearings
- Cooling tower fans
- VFD-driven motor systems
| Parameter | Value |
|---|---|
| Dropping Point | 250–280°C |
| Oxidation Stability | Excellent (ASTM D942: <35 kPa pressure drop) |
| Metal Corrosion Risk | None — no metallic soap chemistry |
| Water Resistance | Good |
| NLGI Grades | 2, 3 |
Positioning InsightA long-life grease for electric motor bearings where high heat and oxidation resistance matter most.
For a full breakdown, see our polyurea grease guide for chemistry, limits, and motor applications.
6. Bentonite (Clay) Grease
Composition : Thickened with bentonite clay.
Properties
- High-temperature stability.
- Water resistance.
- Adhesive properties.
Use when
- Cement kiln car axle bearings
- Glass furnace equipment
- Industrial oven conveyor systems
- Ceramic kiln cars.lications:
| Parameter | Value |
|---|---|
| Dropping Point | None — does not melt |
| Max Continuous Service | 350°C+ |
| Water Resistance | Good |
| Low-Temp Pumpability | Poor — manual application only |
| Compatibility | ❌ Incompatible with all soap-based types |
| NLGI Grades | 1, 2 |
Positioning InsightUsed where temperatures exceed the limits of soap-based greases (>300°C), as it does not melt or lose structure.
For a full breakdown, see our bentonite grease guide for high-temperature limits and application constraints.
7. Extreme Pressure (EP) Grease
Composition : Base grease fortified with extreme pressure (EP) additive packages such as sulfur-phosphorus or solid lubricants.
Properties
- High load-carrying capacity under shock and boundary lubrication conditions
- Anti-wear and anti-scuffing protection to prevent metal-to-metal contact
- Improved film strength at low speed / high load regimes
- Performance validated by ASTM D2596 Four-Ball Weld Load and ASTM D2509 Timken OK Load
Use when
- Jaw crushers
- Ball mills
- Slow-speed heavy-load bearings
- Pin-and-bush connections
- Press and stamping equipment
| EP Additive | Mechanism | Activation |
|---|---|---|
| Sulfur-Phosphorus | Chemical film at asperity contact | 200–400°C surface temp |
| MoS₂ | Solid film — low speed/high load | Ambient — no threshold |
| Graphite | Dry film at extreme surface temp | >400°C surface temp |
Positioning InsightUsed where standard greases fail under shock loads or boundary lubrication, providing protection against wear and surface damage.
For a full breakdown, see our EP grease guide for additive chemistry, test standards, and load performance limits.
Grease Compatibility: Full Reference Matrix
Critical WarningMixing incompatible greases collapses thickener structure — not gradually, within hours of startup. This is the most common cause of catastrophic bearing failure following maintenance changeovers.
| Lithium | Li Complex | Polyurea | Ca Sulfonate | Bentonite | Al Complex | |
|---|---|---|---|---|---|---|
| Lithium | ✅ | ✅ | ❌ | ⚠️ | ❌ | ⚠️ |
| Li Complex | ✅ | ✅ | ❌ | ⚠️ | ❌ | ⚠️ |
| Polyurea | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ |
| Ca Sulfonate | ⚠️ | ⚠️ | ❌ | ✅ | ❌ | ⚠️ |
| Bentonite | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ |
| Al Complex | ⚠️ | ⚠️ | ❌ | ⚠️ | ❌ | ✅ |
✅ Compatible⚠️ Test before use❌ Full purge required
Safe Changeover Procedure (Incompatible Types)
- Operate bearing to 40–60°C to soften existing grease
- Remove all accessible old grease — clean cloths, no solvent unless housing design requires it
- Apply new grease; run 15–30 minutes at operating speed
- Continue applying new grease until old material is fully displaced at seals
- Apply final charge to correct level; document changeover date and new product specification
Selection by Industry: Quick Reference
| Industry | Key Equipment | Primary Challenge | Recommended Type |
|---|---|---|---|
| Cement | Roller press, kiln drives | High temp + abrasive dust | Lithium Complex EP |
| Steel | Continuous casters, rolling mills | Water + high temp + heavy load | Calcium Sulfonate Complex |
| Mining | Jaw crushers, vibrating screens | Extreme shock load + dust | EP Bentonite / Lithium Complex EP |
| Wind Energy | Yaw and pitch bearings | Slow speed + wide temp range | Lithium Complex EP |
| Marine / Port | Crane slewing rings, deck machinery | Saltwater + corrosion | Calcium Sulfonate Complex |
| Food / Pharma | Filling line bearings, mixers | NSF H1 mandatory | NSF H1 Aluminum Complex |
Sourcing from China: Verification Checklist
The procurement risk with Chinese grease manufacturers is documentation verification — not manufacturing quality. The certification requirements are identical to any other sourcing region.
Non-Negotiable Documentation for B2B Procurement
- ISO 9001:2015 — verify the issuing body at UKAS or DAkkS public registry, not on the supplier’s PDF
- NSF H1/H2 registration (6-digit number) for food-processing applications — verify at info.nsf.org
- REACH declaration for EU market shipments
- Product Data Sheets with explicit ASTM, DIN, or IP test method references for every key parameter
Five PDS Parameters That Matter — and Why
| Parameter | Test Method | What It Tells You |
|---|---|---|
| Dropping Point | ASTM D566 / D2265 | Maximum temperature before thickener structure fails |
| Worked Penetration | ASTM D217 | Confirms NLGI grade and actual consistency |
| Four-Ball Weld Load | ASTM D2596 | EP performance under shock loading |
| Water Washout | ASTM D1264 | Water resistance — percentage grease lost |
| Rust Test | ASTM D1743 | Corrosion protection performance |
Suppliers who cannot provide test method references on their PDS are producing to internal standards. That may be acceptable for low-criticality applications. It is not acceptable for critical industrial equipment.
About Anhui Zhongtian PetrochemicalAnhui Zhongtian Petrochemical has manufactured industrial lubricating grease since 1998. All product lines are documented with full ASTM test references; ISO 9001:2015 certification from accredited body available on request. Technical team available for application-specific consultation: Contact →
FAQ
Can you mix polyurea with lithium grease?
No. The thickener structures are chemically incompatible. Mixing causes structural softening and grease leakage, typically within hours of startup. Full purge procedure required before any changeover.
What NLGI grade for centralized systems?
NLGI 1 or 2 for most systems above 5°C ambient and under 50 meters line length. Below −20°C or over 100 meters: NLGI 0 or 00.
What grease for saltwater environments?
Calcium sulfonate complex. Unlike lithium greases that emulsify on water contact, calcium sulfonate complex remains structurally stable after water ingress and provides inherent corrosion protection.
How do I verify NSF H1 certification?
Request the 6-digit registration number from your supplier. Verify at info.nsf.org. Do not accept PDF certificates without registry verification — they may be expired or misrepresent certification scope.
Conclusion
Understanding the various types of grease and their specific applications is essential for maintaining machinery efficiency and extending service life. By selecting the appropriate grease based on operational needs and environmental considerations, industries can achieve optimal performance and reliability.
For more detailed information on industrial lubricants and grease types, visit Zhongtian Petrochemical.