Manufacturing
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# Appendix I Table of hardness values

## Table 3: Typical Vickers hardness numbers for selected materials

Metals | Vickers hardness number (HV) range from soft to hard | Ceramics | Vickers hardness number (HV) | Polymers | Vickers hardness number (HV)
--- | --- | --- | --- | --- | ---
Tin | 5 | Limestone | 250 | Polypropylene | 7
Aluminium alloys | 25–140 | Magnesium oxide | 500 | PMMA | 20
Gold | 35 | Tungsten carbide | 2500 | Polycarbonate | 14
Copper | 40 | Titanium nitride | 2900 | PVC | 16
Iron | 80 | Alumina | 2500 | Polyacetal | 18
Mild steel | 140–280 | Zirconia | 1300 | Polystyrene | 21
Ferritic stainless steel | 170–300 | Quartz | 1200 | CR39 | 40
Martensitic stainless steel | 450–800 | Soda-lime silica glass | 490 | Urea Formaldehyde | 41
Ausstenitic stainless steel | 180–400 | Granite | 850 | Epoxy | 45
Tool steel | 700–1000 | Silicon nitride | 750 | Diamond | 10,000

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