This set of 7 hardness pencils covers the range of Moh's Scales from 4 through to 10.
The set comes in an attractive velvet carry box.
Hardness pencils are pencils with a tip made of one of the minerals on Moh's scale.
These pencils are used to try and scratch a stone and observe if the pencils can scratch the gem. Since this is a destructive method (it leaves a scratch), this test is mostly used on pieces of rough or on a inconspicuous place on the gemstone. It is also suitable for various other geological, construction, as well as industrial test & research purposes.
The gemstone is tested with a pencil of low hardness (starting at 4 or lower no. of hardness pencil) to try to put a tiny scratch on the stone without applying pressure. If no scratch is observed, one repeats this process with a pencil of higher hardness no. (in this case one can use the no.5) and so on until one arrives at the pencil that is able to put a tiny scratch on the stone.
For instance, if one could not scratch the mineral with pencil no.5 but it would leave a scratch with pencil no.6 the hardness of the mineral must be between 5 and 6 on Mohs scale.
To determine the hardness of a concrete surface relative to Mohs’ hardness scale you must perform a scratch test. Start by using the lowest number pick and continue up the scale until the concrete begins to scratch and that is your numeric number of hardness relative to the Mohs’ scale.
1 = Softest 10 = Hardest
Tooling Reference to Mohs’ hardness scale:
2-3: Hard Tooling
3-5: Hard Tooling
5-7: Medium Tooling
7-9: Medium Tooling
Mohs Hardness Tester For Concrete Floor Surface
Hardness Tester For Concrete Floor Surface, Industrial uses,
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|Details||This set of 7 hardness pencils covers the range of Moh's Scales from 4 through to 10. The set comes in an attractive velvet carry box. Hardness pencils are pencils with a tip made of one of the minerals on Moh's scale. 4 -FLUORITE 5 -APATITE 6 -ORTHOCLASE 7-QUARTZ 8-TOPAZ 9-CORUNDUM 10-DIAMOND|
Mohs Scale 4-10 Hardness Pencils - Set of 7 Pencils
- Product Code: HARDPENC410
- Availability: 1