... gate, smelting rare metals, special alloys, ceramics, iron-smelting furnace of the lining (walls and tubes); physical and chemical containers , spark ... strength characteristics, in the chemical system, used for a variety of reaction vessels and pipelines, chemical pump parts; to do ... 1.5 Max 3.5 Max — Note: F is the specification of bonded abrasives and sandblasting; W is for powder;White Corundum ...