Boron carbide and cubic boron nitride powders are widely used as abrasives. Silicon compounds such as silicon carbide are used as abrasives and components of high-strength ceramics. More modern silicon compounds such as silicon carbide form abrasives and high-strength ceramics. Tungsten carbide is the liner material most often used for mineral abrasives. Zirconia is a component in some abrasives, such as grinding wheels and sandpaper. For ferrous metals, the cleaners contain chelating agents, abrasives, and surfactants. Other silicon compounds function as high-technology abrasives and new high-strength ceramics based upon silicon carbide. The process of polishing with abrasives starts with coarse ones and graduates to fine ones. Paper, rubber, plastics, petrochemicals, carbon insulators, and abrasives composed the city's major industries. Using metal implements, harsh scouring pads, or chemical abrasives can damage or destroy cooking surface. Paper, rubber, plastics, petrochemicals, carbon insulators and abrasives were among the city's major industries. There are several objectives possible for grinding with coated abrasives. Bonded abrasives provide a faster cutting action than natural stones. However, the Australian version contains kaolin instead of silica for abrasives. Coated abrasives are most commonly the same minerals as are used for bonded abrasives.