Submerged nozzles using together with monoblock stoppers are used to shroud the casing stream between tundish and mould. This product has the function of flow control, shrouding and direction of the casting stream and also has high resistance to thermal shock, corrosion and mechanical cracking. Item Submerged Nozzle Fused Silica Submerged Entry Nozzle Al2O3-C Body ZrO2-C Slag Line Al2O3 (%) > 45 C + SiC (%) > 26 > 15 ZrO2 (%) > 70 Si O2 (%) ≥ 99 Refractoriness (℃) > 1770 > 1790 A.P. (%) < 18 < 20 ≤ 18 B.D. (g/cm3) > 2.50 > 3.20 ≥ 1.84 C.C.S (Mpa) >20 > 20 > 40 M.O.R. at romm Temp. (Mpa) > 5.0 > 7.0 Permeability Resistance to thermal shock (Times) > 5 > 5 > 10