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Common Hardness of Materials |
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| Material |
Knoop Hardness |
| Talc |
20 |
| Silver |
20 |
| Cooper |
163 |
| Aluminium |
80-250 |
| Annealed Steel |
200 |
| Martensite |
500-800 |
| Glass |
530 |
| Carburized Steel |
730 |
| Chromium Plating |
740 |
| Quarz (Silicon Dioxide) |
820 |
| White Cast Iron |
840 |
| Nitrided Steel |
970 |
| Cementite (Iron Carbide) |
1025 |
| Zirconia |
1160 |
| Zirconium Boride |
1550 |
| Chromium Carbide |
1735 |
| Molybdenum Carbide |
1800 |
| Titanium Carbide |
1800 |
| Tungsten Carbide |
1880 |
| Tantalum Carbide |
2000 |
| Alumina |
2100 |
| Zirconium Carbide |
2100 |
| Beryllium Carbide |
2410 |
| Titanium Carbide |
2470 |
| Silicon Carbide |
2480 |
| Aluminium Boride |
2500 |
| Vanadium Carbide |
2660 |
| Boron Carbide |
2750 |
| Titanium Diboride |
4400 |
| Diamond |
7000 |
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