Quick Answer

Metal bond tools hold diamonds in a metal matrix for aggressive cutting and long life; resin bond tools hold diamonds in a resin matrix for smooth polishing and fine finishes. In a concrete floor job you use both: metal first to cut, resin last to polish.

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What the Bond Actually Does

The bond is the material that holds diamond crystals in the segment. As the bond wears, fresh diamonds are exposed. Metal bonds wear slowly and keep diamonds locked in place, which suits hard materials and heavy stock removal. Resin bonds wear faster and release diamonds sooner, which keeps the surface cool and smooth for finishing work.

Metal Bond Tools

• Best for: grinding, levelling, coating removal
• Pros: fast cutting, long life, aggressive profile
• Cons: leaves scratches, needs to be followed by finer grits
• Typical forms: grinding discs, cup wheels, grinding shoes, metal segments

Resin Bond Tools

• Best for: polishing, honing, gloss finishing
• Pros: smooth surface, high gloss, low risk of deep scratches
• Cons: wears faster, cuts slower, costs more per square metre at coarse grits
• Typical forms: polishing pads, resin bond pads for floors and stone

How to Combine Them

Start with metal bond at coarse grits (6# to 120#) to level and cut, switch to hybrid bond for the transition, then finish with resin bond from 400# upward. This is the standard sequence on polished concrete and terrazzo.

Frequently Asked Questions

Q: Which one lasts longer?

A>Metal bond, by far - often 3-5 times the life of resin at similar grits. That is why metal is used for the expensive coarse steps.

Q: Can resin bond tools cut concrete?

A>They can, but slowly. Use metal or hybrid for any real stock removal.

Q: Do I need both for a polished floor?

A>Yes. Metal removes and profiles, resin refines and shines. Using only one leaves either a rough or a dull finish.

Q: What is hybrid bond?

A>A middle option with both metal and resin properties, often used at 50-200 grit as the bridge between metal and resin steps.

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Conclusion

Metal bond and resin bond are not competitors - they are two stages of one process. Match the bond to the step: cut with metal, polish with resin.