TANNIN CAS NO:18483-17-5 Industrial grade, Food grade, Pharmaceutical grade,Electronic grade TANNIN,CHEMICAL Property:Yellowish or light brown irregular powder ... ≤2.0 Uses: Used as raw materials for manufacturing pharmaceutical gallic acid, pyrogallic acid, and sulfanilamide drugs in chemical ... of various treating agents for various industrial manufactures. pharmaceutical,TANNIN,chemical TANNIN