EXHIBIT 21 Airgas, Inc. and Subsidiaries Corporation Name Domicile - ---------------- -------- Airgas- Gulf States, Inc. DE Airgas- Intermountain, Inc. DE Airgas- Michigan, Inc. DE Airgas- Mid America, Inc. DE Airgas- Mid South, Inc. DE Airgas- Mountain States, Inc. DE Airgas- Nor Pac, Inc. DE Airgas- North Central, Inc. DE Airgas- East, Inc. DE Airgas- Northern California & Nevada, Inc. DE Airgas- South, Inc. DE Airgas- Southwest, Inc. DE Airgas- West, Inc. CA Airgas Canada, Inc. Canada Airgas Carbonic, Inc. DE Airgas Data,LLC. DE Airgas Direct Industrial Vessel, LLC. DE Airgas International, Inc. VI Airgas Realty, Inc. DE Airgas Safety, Inc. DE Airgas Specialty Gases, Inc. TX ATNL, Inc. DE Cylinder Leasing Corp. DE FORAIR, Inc. DE Forgas, Inc. DE Nitrous Oxide Corp. DE Radnor Funding Corp. DE Red-D-Arc, Inc. NV Red-D-Arc Limited Canada RSCI,Inc. DE Rutland Tool & Supply Co., Inc. CA