Soar Refractory applies MAS Matrix optimization system and uses high-purity, high-density, high-strength material in producing this spokewise Cr2O3-corundum-based direntional slit purging plugs. They have the special features of structural stability, excellent air permeability, adjustable air volume, high blowing capacity, high erosion and corrosion resistance, long service life. This type of purge plugs is a new composite product using high-tech special raw material and is coated by castables with high performance. The air passes through conventional slits. This series of product have even higher blowing capacity and longer service life.