EXHIBIT 21 Airgas, Inc. and Subsidiaries Corporation Name Domicile - ---------------- -------- Airgas Canada, Inc. Canada Airgas Carbonic, Inc. DE Airgas Data, LLC DE Airgas East, Inc. DE Airgas Great Lakes, Inc. DE Airgas Gulf States, Inc. DE Airgas Intermountain, Inc. CO Airgas International, Inc. VI Airgas Mid America, Inc. DE Airgas Mid South, Inc. DE Airgas Nor Pac, Inc. DE Airgas Northern California & Nevada, Inc. DE Airgas North Central, Inc. DE Airgas Realty, Inc. DE Airgas S.A. de C.V. Mexico Airgas Safety, Inc. DE Airgas South, Inc. DE Airgas Southwest, Inc. DE Airgas Specialty Gases, Inc. TX Airgas West, Inc. CA ATNL, Inc. DE Nitrous Oxide Corp. DE Puritan Medical Products, Inc. DE Radnor Funding Corp. DE Red-D-Arc, Inc. NV Red-D-Arc Limited Canada Rutland Tool & Supply Co., Inc. CA