What is Diamond Suspension?
Diamond suspension (sometimes called liquid diamond compound or diamond slurry) is a polishing solution containing micron-sized diamond particles evenly dispersed in a liquid carrier. This formulation allows the abrasive particles to remain evenly distributed, ensuring consistent polishing and material removal during finishing operations.
Diamond suspensions are widely used across precision industries because the hardness of diamond allows it to polish extremely hard materials such as hardened steel, carbide, ceramics and technical metals.
Product Composition
Our diamond suspension formulation contains:
-
Water: 40–70 % by weight
-
Dipropylene glycol: 20–50 % by weight
These components create a stable carrier fluid that helps maintain uniform dispersion of the diamond particles during polishing.
The suspension contains high-quality graded diamond abrasive, ensuring consistent particle size and predictable polishing performance.
High Diamond Content
Our diamond suspension contains a higher diamond concentration than many competing products on the market.
Higher diamond concentration provides:
-
faster polishing performance
-
more efficient material removal
-
improved finishing consistency
-
longer working life between applications
This makes the product particularly suitable for professional polishing environments and industrial finishing processes.
Typical Applications
Diamond suspension is commonly used for:
-
Injection mould polishing
-
Tool & die finishing
-
Precision engineering components
-
Metallographic sample preparation
-
Flat lapping operations
-
High-precision surface finishing
Diamond suspensions are frequently used where extremely consistent surface finishes and tight dimensional tolerances are required.
Diamond Suspension vs Diamond Paste
Diamond suspension and diamond paste both use micron-sized diamond particles to polish hard materials. The difference lies mainly in viscosity and application method.
Diamond suspension uses a fluid carrier, making it ideal for automated polishing systems and flat lapping operations where the abrasive must spread evenly across a polishing surface.
| Feature | Diamond Suspension | Diamond Paste |
|---|---|---|
| Consistency | Liquid / sprayable | Thick paste |
| Application | Flat lapping and machine polishing | Manual polishing |
| Distribution | Even distribution across large surfaces | Localised polishing |
| Automation | Ideal for dosing systems | Generally applied manually |
| Typical Industries | Metallography, precision engineering | Tool & die polishing, mould finishing |
When to Use Diamond Suspension
Diamond suspension is typically preferred for:
-
Flat lapping plates
-
Machine polishing systems
-
Metallographic preparation
-
Continuous polishing processes
The liquid carrier allows consistent dosing and even abrasive distribution during polishing.
Moleroda also supplies diamond compound in paste form, available in medium and high concentrations.
How to Use Diamond Suspension
1 - Shake Before Use
Always shake the bottle before use to ensure the diamond particles are fully mixed throughout the suspension.
This ensures uniform abrasive distribution.
2 - Apply to the Polishing Tool or Surface
The suspension can be applied to:
-
lapping plates
-
polishing pads
-
polishing cloths
-
felt polishing tools
-
wooden lapping sticks
Diamond suspensions can be used for both manual polishing and machine-based lapping systems.
3 - Spray or Dose During Polishing
The product can be used in two ways:
-
Manual spray bottle application
-
Automatic dosing systems on polishing machines
If using a spray bottle, apply small amounts regularly to maintain lubrication and consistent polishing action.
4 - Lubricate as Necessary
In some polishing applications it is beneficial to use lapping fluid alongside diamond products.
Lapping fluid helps:
-
maintain lubrication
-
prevent drying during polishing
-
reduce scratching
-
improve abrasive performance
Diamond Polishing & Lapping
Progression Guide
Our diamond suspension is available in the following micron grades:
| Micron | Typical Use |
|---|---|
| 45 micron | Initial lapping / stock removal |
| 25 micron | Surface preparation |
| 16 micron | Scratch removal |
| 10 micron | Pre-polishing |
| 6 micron | Fine polishing |
| 3 micron | Mirror finishing |
| 1 micron and below | Ultra-fine / optical finishing |
Using progressively finer diamond grades allows each polishing stage to remove the scratch pattern from the previous stage.
Recommended Products
Diamond suspension is typically used with various polishing tools depending on the application.
Recommended Polishing Tools & Consumables
Common consumable tools & applicators include:
![Mounted Wooden Lapping Sticks [600x600]](https://moleroda.com/wp-content/uploads/2021/11/woodenbobsL-2.jpg)
Mounted Polishing Products
Mounted Felt Bobs & Points
Mounted Polishing Products
For rotary polishing operations, felt or wooden bobs provide good contact with the workpiece and help distribute the suspension evenly.
Recommended Lapping & Rotary Polishing Systems
Popular rotary and lapping tools include:
Micromotor Systems
Moleroda OZ Black Micromotor System with Handpiece and Foot Pedal
Air (Windy) Tools
NSK Air Grinder – Impulse NA45-400 with 45° Angle Head (40,000 RPM)
Flexible Shaft Machines
Air (Windy) Tools
