Product application: Rubber industry USES it with alum, H drilling agent to play a uniform role in the production of rubber, sponge. The metallurgical industry USES it as a flux for casting ingots. The machine industry is used as molding assistant for casting steel (sand) sand mold. The printing and dyeing industry is used as a fixing agent for dyeing and printing, an acid-base buffer, and a post-treatment agent for finishing fabrics. Adding baking soda to the dye prevents the yarn from producing colored flowers.