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If you work with gemstones or glass, you know the importance of a good lap disc.
It's the foundation of your grinding work – the surface that shapes, smooths, and prepares your materials.
For years, the choice has been simple: you bought what was available. But now, you have a choice.
Sintered diamond or electroplated diamond?
One gives you short-term savings with frequent replacements. The other gives you long-term value with consistent, durable performance.
In this article, we'll compare sintered diamond and electroplated lap discs – and explain why the 200mm sintered diamond lap disc is the smarter long-term investment for gemstone and glass grinding.
A sintered diamond lap disc is made by mixing diamond grit with metal powder (bronze, cobalt, or iron-based) and then sintering – heating and compressing until the metal fuses around each diamond grain.
The diamond grit is distributed throughout the entire working layer – not just on the surface.
| Feature | Sintered Diamond (This) | Electroplated Diamond |
|---|---|---|
| Diamond location | Throughout working layer | Only on surface |
| Diamond layer thickness | Thick (several millimeters) | Thin (single grain layer) |
| Self-sharpening | Yes – fresh diamond exposed as it wears | No – once worn, it's gone |
| Can be dressed? | Yes | No |
How It's Made: Diamond grit is suspended in a nickel plating solution and electrochemically bonded to a steel disc in a single layer.
| Aspect | Electroplated Lap Disc |
|---|---|
| Diamond layer | Single grain layer on surface |
| Initial sharpness | Very sharp |
| Life | Short – diamond layer wears off |
| Cost | Lower upfront cost |
| Maintenance | None – cannot be dressed |
| Best for | Occasional use, short runs |
How It's Made: Diamond grit is mixed with metal powder and sintered under high heat and pressure.
| Aspect | Sintered Diamond Lap Disc |
|---|---|
| Diamond layer | Diamond throughout working layer |
| Initial sharpness | Moderate (improves with break-in) |
| Life | Long – self-sharpening |
| Cost | Higher upfront cost |
| Maintenance | Can be dressed to refresh surface |
| Best for | Production, long-term use, bulk grinding |
This is the most important difference between sintered and electroplated lap discs.
| Stage | Sintered Disc | Electroplated Disc |
|---|---|---|
| New | Sharp diamond exposed | Sharp diamond exposed |
| After some use | Diamond dulls, bond wears slightly | Diamond dulls, no new diamond |
| After more use | Dull diamond releases, fresh diamond exposed | Diamond layer worn off – disc is dead |
| Continued | Consistent cutting continues | Disc must be replaced |
| Benefit | Sintered Disc | Electroplated Disc |
|---|---|---|
| Consistent cutting speed | ✅ Yes – self-sharpening keeps it sharp | ❌ No – slows down as diamond wears |
| Long life | ✅ Yes – diamond throughout the layer | ❌ No – only one layer |
| Lower cost per part | ✅ Yes – fewer disc changes | ❌ No – frequent replacements |
| Can be dressed | ✅ Yes – refresh when needed | ❌ No – cannot be dressed |
| Gemstone Type | Hardness (Mohs) | Application |
|---|---|---|
| Quartz (amethyst, citrine) |
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