There are many different scales / methods to measuring hardness. The best method you choose will depend on the material that you are measuring. The below chart is intended to give you a general reference of how some of these methods relate to others, using .
|
| Mohs (HM) |
Knoop (HK) |
Brinell Indentation (HB Indentation) |
Brinell 10mm Standard 500 kgf (HB 500) |
Rockwell A-Scale (HRA) |
Vickers (HV) |
Material Example |
| 1 |
-- |
-- |
-- |
-- |
27 |
Talc |
| 2 |
-- |
-- |
-- |
-- |
61 |
Gypsum |
| 2.5 |
117 |
-- |
90 |
-- |
102 |
- |
| 3 |
169 |
4.9 |
136 |
-- |
157 |
Calcite |
| 3.5 |
239 |
4.10 |
189 |
60 |
229 |
- |
| 4 |
327 |
3.50 |
-- |
66 |
315 |
Fluorite |
| 4.5 |
436 |
3.08 |
-- |
72 |
418 |
- |
| 5 |
564 |
2.76 |
-- |
77 |
535 |
Apatite |
| 5.5 |
705 |
2.44 |
-- |
81 |
669 |
- |
| 6 |
839 |
2.27 |
-- |
84 |
817 |
Feldspar |
| 6.5 |
929 |
-- |
-- |
86 |
982 |
- |
| 7 |
-- |
-- |
-- |
-- |
1161 |
Quartz |
| 8 |
-- |
-- |
-- |
-- |
1567 |
Topaz |
| 9 |
-- |
-- |
-- |
-- |
2035 |
Corundum |
| 10 |
-- |
-- |
-- |
-- |
-- |
Diamond |
|
