Grease drum pump

Product Manual：

I. Grease: Definition and Essence：

1. Standard Definition

Grease is a semi-solid lubricating medium composed of base oil, thickener, and functional additives. At ambient temperatures, it exists as a paste that adheres to friction surfaces, serving to reduce friction, resist wear, seal, prevent rust, and dampen vibrations.

2. Essence (Core Principle)

The essence of grease: a semi-solid colloidal dispersion system where the thickener acts as a framework to adsorb and retain the base oil.

Simply put:

Thickener = Sponge framework

Base oil = Oil within the sponge

Under stress/heat, it releases an oil film for lubrication; at rest, it maintains its semi-solid form without loss.

3. Summary of Medium Properties

State: Semi-solid colloidal medium

Category: Lubricating medium / Tribological medium

Operating principle: Thixotropy (thins under shear, regains paste-like consistency upon cessation)

II. Classification of Greases：

1. Classification by thickener (most mainstream and commonly used)

(1) Calcium-based grease

Good water resistance, inexpensive, not heat-resistant

Primarily used in low-speed, general machinery, and water pumps

(2) Sodium-based grease

Heat-resistant, not water-resistant

Used in motors and high-temperature bearing areas

(3) Lithium-based grease

General-purpose, water-resistant, high-temperature resistant, excellent overall performance

Currently the most widely used general-purpose grease

(4) Complex lithium-based grease

High-temperature, long-life, multi-purpose

Mainstream for automotive, motors, bearings, construction machinery

(5) Aluminum-based / Complex aluminum-based grease

Water-resistant, anti-drip, excellent stringing properties

Open gears, chains

(6) Bentonite Grease (Inorganic Thickener)

No drop point, exceptional high-temperature resistance

(7) Polyurea Grease

High-temperature, long-life, metal soap-free

Specialized for motors and high-temperature bearings

(8) Fluorinated Grease (Perfluorinated Polyether)

Chemical/solvent resistance, high-temperature stability, exceptional durability

Precision instruments, vacuum systems, chemical corrosion protection

2. Classification by Application

(1) General-purpose Greases

Lithium-based, lithium complex—universal equipment use

(2) High-Temperature Greases

Lithium complex, polyurea, bentonite

(3) Extreme Pressure Anti-Wear Greases

Gears, bearings, heavy-duty equipment

(4) Waterproof Grease

Calcium-based, Aluminum-based, Compound Lithium

(5) Low-Temperature Grease

Sub-zero environments, precision machinery

(6) Food-Grade Grease

Food/medical equipment, safe and non-toxic

Sealing Grease

Valves, plugs, anti-seize/anti-stick

3. Most Common Industrial Greases (Simplified Version)

General-purpose lithium-based grease

Composite lithium-based grease

Calcium-based grease

Sodium-based grease

Polyurea grease

Extreme pressure lithium-based grease

Fluorinated grease

III. Only these types of barrel pumps can draw grease：

(1) Screw Pump (High-Viscosity Specific)

Suitable for: Conveying extremely soft, high-viscosity grease

Commonly used in automated, continuous conveying systems

(2) Pneumatic Plunger Grease Pumps (Most Common)

Suitable for: 18L, 20L, 50L, 200L grease drums

Principle: Compressed air drives a piston to force out paste-like grease

Advantages: High pressure, stable flow, explosion-proof, dirt-resistant

Applications: Industrial lubrication, filling, centralized oil supply systems

(3) Electric Plunger-Type Grease Pump

Suitable for: Fixed workshop stations, locations without compressed air

Note: Must be plunger-type construction, not standard impeller pumps

(4) Manual Grease Pump / Hand-Operated Rod Pump

For small containers and minimal usage

Low efficiency, only suitable for small-volume filling

IV. Pumps Absolutely Not Suitable for Grease Transfer：

Standard electric liquid transfer pumps (drum pumps / solvent pumps)

Centrifugal pumps, gear pumps (cannot draw high-viscosity grease)

Plastic hose pumps, diaphragm pumps (generally ineffective for grease)

Technical Specifications Table：