... 70%min 3 Appearance:99% MSA used in Pharmaceutial industry, 70%MSA used in electroplating MethaneSulfonic Acid (MSA) CAS NO.75-75- ... alkylation, esterification and polymerization, 99% MSA mainly used in Pharmaceutial industry, while 70%MSA used in electroplating. Methane Sulfonic Acid ... 75-75-2 70%min or 99%min MSA