GREEN SILICON CARBIDE（GC） Green silicon carbide has a high purity,and is brittle.Knoop hardness is 3288-3400 kg/mm2 Grinding wheels made of it are suitable for processing hard and brittle non-meltalic workpiece,such as cemented carbide,optical glass, agate, ceramics as well as hard alloy etc.It can also be used in the manufacture of high-class refractory products,electrothermal products, electrical appliance products, etc.