99 flake alkali is a type of flake alkali, chemical name sodium hydroxide, white semi transparent solid, used as a basic chemical raw material, widely used in papermaking, synthetic detergents, soap, viscose fiber, artificial silk, cotton and other light textile industries, pesticide, dye, rubber and chemical industries, petroleum drilling, refining petroleum oil and tar, as well as defense industry, machinery industry, wood processing, metallurgical industry, pharmaceutical industry and urban construction. It is also used in the manufacture of chemicals, paper, soap and detergent, artificial silk and glass paper, processing bauxite to produce alumina, as well as in the finishing of textiles, water treatment, etc.