... .7% ≤0.3%Na2SO4 %≤ ≤ 0.1 2.Use: 1)Boric acid mainly used for the glass industry,convenient in the enamel ... the luster and the prison degree of theware. 2)Boric acid is used extensively for the glass industry, in particular E ... be done in agriculture, pesticides, and trace element fertilizers. Boric acid is produced matrix material, and its metal welding,leather and ...