This fused silica drainage opening is uses the high quality fused silica glass primarily raw material, the increase rare material, pulping, the casting, after controls the wuntho type kiln burn to complete automatically. The product has the intensity to be high, the heat conduction is small, the anti-heat shock stability is good, bears the temperature and the steel slag erosion performance fine characteristic. Product completely after X- light beam crack detection exports gives the domestic and foreign users.