Tungsten carbide (WC) is produced from tungsten and carbon at a temperature of around 1500 °C. Its individual grain displays diamond-like hardness. Wear-resistant, sintered WC is used among other things as a material for seal faces and stationary seats. The strength of pure WC would be totally inadequate, even after sintering, its grain bonding has to be strengthened, therefore, by a metallic binder. Cobalt (Co), nickel (Ni) or chromium nickel molybdenum (CrNiMo) are used as binders with increasing resistance to corrosion. The proportion of binder added to face materials lies between 6 and 9%.