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 Atlantic, Inc. DE Airgas- Mid South, Inc. DE Airgas- Mountain States, Inc. DE Airgas- Nor Pac, Inc. DE Airgas- North Central, Inc. DE Airgas- Northeast, 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 Enterprises, Inc. DE Airgas Carbonic, Inc. DE Airgas Data,LLC. DE Airgas Direct Industrial Vessel, LLC. DE Airgas Direct Industrial, Inc. DE Airgas International, Inc. VI Airgas Lyons, Inc. DE Airgas Management (Indian) Pvt. Ltd. India Airgas New England Real Estate, Inc. DE Airgas Polska Zo.o Poland Airgas Realty, Inc. DE Airgas Safety, Inc. DE Airgas Specialty Gases, Inc. TX AMI Equipment, LLC. PA ATNL, Inc. DE Cylinder Leasing Corp. DE FORAIR, Inc. DE Forgas, Inc. DE JWS Airgas, Inc. NJ Kamool Airgas, Ltd. Thailand Mauritius Industrial Gases, Inc. Mauritius NEJD Pipeline Co., Inc. DE Nitrous Oxide Corp. DE Poligaz-Gdansk Poland Poligaz, SA. Poland Red-D-Arc, Inc. NV Red-D-Arc Limited Canada RSCI,Inc. DE Rutland Tool & Supply Co., Inc. CA