CAS Number: 123-31-9 Molecular formula: C6H6O2 Appearance: white to off-white crystal Content: ≥99.0% Residue from ignition: 0.05% max Iron(Fe): 0.002% max Heavy Metal(based on Pb): 0.002% max Usage:Can be used as intermediates of polymer, monomer inhibitor, dyes and auxiliary; as antioxidant in food and medicine industry; as anti coagulant for gas; developer for film, photos and X-ray film.