What is Grease?
Grease is a semi-solid lubricant composed of base oil, a thickener (soap or soap-based compound), and various additives.
Unlike liquid oils, grease is not fluid. Thanks to this characteristic, it adheres to the applied surface and remains in place for a long time. It is especially an ideal lubrication solution for components that:
• Operate under high pressure
• Are difficult to lubricate continuously
• Work in open or dusty environments
Main Functions of Grease
• Reducing friction
• Preventing wear
• Providing protection against corrosion (rust)
• Creating a barrier against water and external contaminants
• Increasing load-carrying capacity
Where is Grease Used?
• Industrial and manufacturing facilities
• Automotive industry
• Agricultural and construction machinery
• Open gear mechanisms
• Chains
• Crane systems
What Does the Grease Number Mean?
The numbers on grease are generally determined according to the NLGI (National Lubricating Grease Institute) standard. This number indicates the grease consistency (hardness level).
NLGI Classification
| NLGI Grade | Consistency |
|---|---|
| 000 | Very fluid |
| 00 | Fluid |
| 0 | Soft |
| 1 | Semi-soft |
| 2 | Medium |
| 3 | Hard |
| 4-5-6 | Very hard |
The most commonly used grease type is NLGI Grade 2. Its consistency is similar to that of toothpaste.
Grease is a critical lubricant for ensuring the safe, efficient, and long-lasting operation of machines and equipment. Selecting a grease with the appropriate NLGI grade and technical specifications for the intended application helps reduce maintenance costs and improves overall performance.
For proper grease selection, the equipment manufacturer’s technical recommendations should always be taken into consideration.
