FIRE BRICK FOR BOTTOM PORTION OF FLOAT-BATH, THE METHOD FOR ITS PRODUCTION, FLOAT-BATH AND THE METHOD FOR THE PRODUCTION OF PLATE GLASS WITH THE USE OF FLOAT-BATH

摘要

A method for producing a fire brick for a bottom portion of a float bath by the use of a clayey material containing 30 to 45 mass % of AlO, 50 to 65 mass % of SiO, and having a content of NaO of 1 mass % or less, characterized in that a potassium compound is added in such a manner that the resultant fire brick for a float bath has a KO content of 2 to 4 mass %. A fire brick for use in a bottom portion of a float bath of a flat glass produced by the float method, which is produced by the above method, can inhibit the reaction with the NaO in glass on the surface thereof and thus can prevent a flaking phenomenon.