Synthetic Polycrystalline Diamond can be divided into hard polycrystalline diamond and soft polycrystalline diamond. The hard polycrystalline diamond has speciality of extremely hard, well wear resistance, compressive strength and toughness of shock resistance and is widely used in geological exploration, petroleum boring and machining operation, etc. The soft polycrystalline diamond with well abrasiving performance,it is an ideal material for grinding diamond.