Concrete Hardness Guide for Choosing Metal Bond Diamonds
Concrete Hardness Guide for Choosing Metal Bond Diamonds
How to match bond hardness, grit, and grinding goal for better cutting speed, longer tool life, and cleaner scratch control.
Choosing the right metal bond diamond starts with one question: how hard is the concrete?
This matters because bond hardness controls how quickly fresh diamonds are exposed during grinding. If the bond is too soft for the slab, the tool can wear too fast. If the bond is too hard for the slab, the tool may glaze, cut slowly, and leave an inconsistent scratch pattern.
A practical rule used on many jobs is simple. Soft concrete usually needs a harder bond. Hard concrete usually needs a softer bond. Medium bond is often the starting point when slab hardness is uncertain, but it is not always the best final answer.
Start by looking at the floor condition and the job goal. If the slab is hard and dense, you usually need a softer bond to keep the tool open and cutting. If the slab is soft, abrasive, or sandy, you usually need a harder bond to avoid excessive wear. If your first cut is only for scratch refinement or light cleanup, your bond and grit choice may be different from a heavy opening pass.
Grit matters too. Lower grits are commonly used for aggressive opening, coating residue cleanup, and major scratch removal. Mid grits are often used for scratch control and surface refinement before transition. The right progression depends on slab hardness, floor flatness, and what step comes next.
For most contractors, bond selection should never be separated from the full process. Ask these five things before choosing metal bond diamonds: machine brand and model, slab hardness, current floor condition, target result, and the grit stage you plan to run next.
If your goal is polished concrete, the metal bond step should leave a scratch pattern that the transition step can realistically remove. If your goal is coating prep or heavy surface opening, the tool should prioritize cutting efficiency and floor consistency before polish quality.
Monkey King Diamond supplies metal bond grinding tools for major grinder systems, including Lavina, Husqvarna, HTC, Scanmaskin, Terrco, EDCO, and more. If you are unsure which bond fits your slab, send your machine model, concrete condition, and target result. We can help narrow the right starting point faster.
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