Because of the classification of methanesulfonic acid as a skin corrosive of Category 1B (H314) according to the CLP Regulation, it is basically assigned to packing group II according to dangerous goods regulations. Because UN No. 2586 ALKYLSULPHONIC ACIDS, LIQUID or ARYLSULPHONIC ACIDS, LIQUID with not more than 5% free sulphuric acid is possible only for Packing group III, a suitable collective entry must be selected.