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What Makes Grinding Tools Work Faster and Longer

If you ask a diamond wheel sellers about their grinding wheels, there's a good chance they will give you the classic "grinds fast, long life"  to describe their products.

Diamond grinding is a mature technology, and there are effective ways a manufacturer can alter the performance of their grinding wheels. Diamond grit size and bonding choices are the primary factors that determine a wheel's performance.


  • Diamond grits are the grinding agents. Naturally the bigger and higher-grade they are, the more aggressively the wheel will grind.
    • The common grit size for concrete wheel is #30/40.
    • More aggressive grinding wheels will sometimes use #20/25 diamond grits.
  • Bonding is the material that holds the diamond grits together. An optimized bonding formula should accomplish two things:
    • Holds the diamond grits firmly to increase grinding life time.
    • When the grits do grind away, it should expose the next layer of grits quickly.


We did some testing to see the effects in action, and here's what we've found:

Grit Size

  • A #20/25 wheel grinds about 30-40% faster compare to a #30/40 wheel. (on concrete, with same type of bonding)
  • However, the lifetime is reduced by about 10%-15%


  • For concrete under 4000 psi, the difference between a low cost bonding and a high end bonding isn't significant.
  • For concrete over 4000 psi however, using an optimized bonding grinds 20-40% faster, and increases lifetime by 50-80%. They also feel a lot smoother during use.

With consideration to labor costs, the performance and lifetime you get with better grit and bonding will be well worth its higher cost.

If we are also grinding epoxy, mastics, glues, etc., the higher grit size and bonding become a necessity as the lower end grinding wheels will struggle to function on such tacky surfaces.



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  • Jim Leonard on

    Black mastic under floor tile? 200 rooms, 15’*20’

  • Joni on

    I am making a concrete countertop and just need a wet sander to do a smooth finish. What should I buy? I will also be pulling up tile and finishing a concrete floor. What will I need for that?

  • David M on

    I work as an engineering support technician. When problems arise, I get to research to find the answers needed to provide the lasting results needed. My last task was to find a way to paint guide stripes on an old loading dock floor. Not paint would last longer than 3 months before looking terrible and having to be painfully scraped and reapplied. I knew there had to be a better way. During the research, I learned that years of traffic was one main issue, no prep work was done other than sweeping. One source told me that the cement needed to be ground to provide a clean area to etch. They mentioned eDiamondTools by name, and that led me to this site. I found the proper wheel and was satisfied. Knowing the clean up was going to be a nightmare, I returned to learn that dust shrouds were actually made to assist in that task. I’ve decided that this problem was laid on my shoulders, and I wasn’t willing to follow the same path others had, so I am now prepared to make these guide stripes last years, rather than months. Thanks to your site, I know that I am now ready to tackle this project with great results. Thank you.

  • Wayne Scow on

    Which will work best for removing carpet glue from concrete

  • Bruce S Cameron on

    I have a job in a critical area where the dust may be contaminated with alpha particles. The concrete floor is about 50 years old, and is very hard and uneven and we have to grind it as flat as we can. We have tried shrouds on the grinder and super vacs, and too much dust gets out . Could we use one of these diamond wheels on a slightly wet floor? Thank you for any help.

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