... No. 6291-65-2 Hard Chrome Additive Methane Disulfonic Acid, Dipotassium SaltCAS No. 6291-65-2Hard Chrome Additive TECHNICAL DATA SHEET ... Methane Disulfonic Acid, Dipotassium Salt Chemical nature Chemical name Methane Disulfonic Acid, Dipotassium SaltMolecular formula CH2K2O6S2Molecular weight 252.34CAS ... drum, stored in cool and dry place Methane Disulfonic Acid, Dipotassium Salt