May. 05, 2025
Hardness Test-Pick The Right Tooling
How hard or soft is the floor that is to be grinded?
Which tooling should you start with without risking the tools to wear out too fast or that they will "glaze"?
With a simple scratch test, you can determine the hardness of the floor or the concrete in relation to the "Mohs scale". Then you can select a right tooling accordingly.
What is "Mohs scale"? The Mohs hardness scale indicates the scratch resistance of different materials in that a harder material is able to scratch a softer material. The method was created in 1812 by the German chemist and mineralogist Friedrich Mohs (1773 –1839).
The Mohs hardness scale is divided into a scale that goes from the softest material to the hardest material on earth, diamond, which has number 10 on the scale. For example, corundum (9) is twice as hard as topaz (8), while diamond is four times as hard as corundum.
1-Talc
2-Gypsum
3-Calcite
4-Fluorite
5-Apatite
6-Orthoclase
7-Quartz
8-Topaz
9-Corundum
10-Diamond
Make a simple scratch on the concrete surface and you will get the hardness of the concrete according to the Mohs scale. Start with the lower numbers of the tools andwork you way up the scale until you scratch the floor. See what number the pick has made the scratch and choose the bond of your tool accordingly. Note that this is just a guideline for your tooling choice.
Nowadays, when you buy a floor grinder, for example HTC or Scanmaskin floor grinder, there is generally a scratch tester included
Let’s take HTC EZ series and Scanmaskin Bauta Double series as examples.
Make a scratch test, and take the right tooling for your job!
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