Selecting the correct diamond grinding tools is the most important technical decision in the concrete polishing process. Your choice of “bond” (the metal or resin matrix holding the diamonds) and “grit” (the size of the diamond abrasive) determines whether your floor is leveled correctly or ruined by improper cutting.
Following industry standards for surface preparation, here is the professional guide to selecting and using diamond tools.
1. Understanding the “Bond” Matrix
The “bond” is the metal or resin that holds the diamond particles. It must wear away at the right rate to expose new, sharp diamonds.
- Soft Bond: Used on Hard Concrete. Since the floor is dense, it will dull the diamonds quickly. A soft bond wears away fast, constantly exposing fresh diamonds so you can continue cutting.
- Hard Bond: Used on Soft/Porous Concrete. On soft floors, diamonds stay sharp longer but the bond can wear away prematurely. A hard bond keeps the diamonds locked in place longer, ensuring they do the work before the tool disappears.
2. Selecting the Grit Sequence
The grit is the size of the abrasive. You move from large (coarse) to small (fine) to refine the surface.
- Metal-Bond (30 to 120 Grit): These are your “cutting” tools. They handle the heavy lifting: removing surface paste, leveling high spots, and opening the pores.
- Transition/Resin-Bond (100 to 400 Grit): These remove the scratch pattern left by the metal-bond tools.
- Polishing Resin (800 to 3000 Grit): These refine the surface to a high-gloss finish.
3. Usage Best Practices
The most common cause of flooring failure is skipping a grit or failing to clean the floor.
- The “Double the Grit” Rule: Never jump more than double your current grit level (e.g., from 50 to 100 is fine, but 50 to 200 will leave visible “pigtail” scratches that will never come out).
- The Cleaning Protocol: You must vacuum the slab completely after every single tool change. If a single 50-grit diamond particle gets trapped under a 400-grit pad, you will create a deep, visible scratch that destroys your finish.
- Directional Grinding: For the best results, grind in a cross-hatch pattern (North-South, then East-West) during the initial stages to ensure the floor is perfectly flat and consistent.
Comparison of Diamond Tooling
| Tool Type | Grit Range | Primary Use | Impact on Surface |
| Metal Bond | 30 – 120 | Leveling/Heavy Removal | Creates deep “cut” |
| Hybrid/Transition | 100 – 400 | Removing scratches | Smooths the cut |
| Resin Bond | 800 – 3000 | Polishing/Refining | Creates clarity/gloss |
Professional Execution in the GTA
In the Greater Toronto Area, concrete characteristics vary wildly between new pours and older warehouse slabs. An experienced technician must perform a “scratch test” or use a Mohs hardness pick kit to determine the concrete hardness before starting. If you use a hard-bond tool on hard concrete, you will “glaze” the diamonds, effectively turning your expensive tools into useless metal blocks.
For professional-grade polishing that matches the correct diamond technology to your specific slab, AK Level & Polish provides the expertise needed to navigate these technical variables. They ensure that every grit sequence is executed with the proper tooling, vacuum protocol, and densification chemistry to deliver a flawless, durable result.
Would you like to discuss the specific tools or diamond types required for a slab you are currently evaluating?
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