What is Industrial Grease? Composition & Types

What is grease?

In industrial maintenance, grease is far more than just "thick oil"—it is a purpose-engineered, semi-solid lubricant designed to stay in place where liquid oil would leak, wash away, or fail to provide adequate protection.

The Basic Composition

Grease functions like a fluid-filled sponge. The matrix or structure holds the oil and
additives in suspension, releasing the fluid to lubricate under friction and dynamic load, then reabsorbing it as movement stops. Its composition breaks down into three key ingredients:

Base Oil (60% – 75%):
The primary fluid responsible for doing the actual work of lubrication.Can be mineral, synthetic, or bio-based.
Thickener (5% – 25%):
The chemical "sponge" structure.Usually metallic soaps (e.g., Lithium, Calcium, Aluminum complex) or non-soaps (e.g., Polyurea, Clay).
Additives (5% – 20%):
Performance enhancers that provide Anti-Wear (AW), Extreme Pressure (EP) resistance, anti-corrosion, or oxidation stability.

When to use Grease vs. Oil

Factor	Grease	Oil
Sealing Capability	Acts as a secondary physical seal against dirt and moisture.	Requires mechanical seals to prevent leakage.
Retention	Stays localized on unsealed or open components.	Gravity causes it to drip and run off exposed surfaces.
Cooling & Heat	Poor thermal dissipation.	Excellent heat transfer and cooling properties.
Re-application	Ideal for intermittent or hard-to-access lube points.	Best for continuous recirculation and filtering systems.

Why it matters for Lubrication Reliability™

From a plant reliability perspective, applying the wrong grease or failing to manage re-lubrication intervals is a leading cause of premature bearing failure. Ensuring the Right Grease is matched with the Right Quantity at the Right Time minimizes friction, eliminates solid contamination ingress, and maximizes asset lifespan

What is grease?