Quaternary Ammonium Salt Tetramethylammonium Chloride(TMAC) CAS 75-57-0 is used as Phase transfer catalyst and also be used as polarographic analytical reagent.Tetramethylammonium Chloride CAS 75-57-0 is white to almost white crystalline powder., Quaternary Salts Of Ammonium Tetramethylammonium Chloride CAS 75-57-0 is corrosion inhibitor for battery anodes, e.g..