Usage: The products of Sillimanite are characterized by good resistance to molten glass corrosion and to alkali-vapor, they are widely used as channel, cover block, spout, plug, tube and feed block. By isostatic press or slip casting, the larger size and irregular products can be produced. Specification: 1st Grade 2nd Grade 3rd Grade K2O+Na2O 0.5%max. 0.6%max. 0.8%max. Refractoriness °C: 1760oC Hardness: 7 Density: 3.1~3.2g/cm3 Loss of Ignition: 0.54~0.88% Size: 100~180 mesh Output: 120t/m. Package: 50kg net each 1000kg net each