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Dry Etchants
Dry and Wet Etchants
Wet Etchants
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Single Crystal Etchants
Thin Film Etchants
Thin Foil Etchants
Wafer Etchants
Al Etchants
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Ga Etchants
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In Etchants
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| Material | Knoop Hardness |
| Talc | 20 |
| Silver | 20 |
| Copper | 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 |