Exhibit 21
Airgas, Inc. and Subsidiaries
Corporation Name Domicile
Airgas, Inc. DE
Airgas Canada, Inc. Canada
Airgas Carbonic, Inc. DE
Airgas Data, LLC DE
Airgas - East, Inc. DE
Airgas Intermountain, Inc. CO
Airgas Investments, Inc. DE
Airgas Medical Services, Inc. DE
Airgas Merchant Gases, LLC DE
Airgas Merchant Holdings, Inc. DE
Airgas - Nor Pac, Inc. DE
Airgas Northern California & Nevada, Inc. DE
Airgas On Site Safety Services, Inc. DE
Airgas - Refrigerants, Inc. DE
Airgas Retail Services, LLC DE
Airgas S.A. de C.V. Mexico
Airgas Safety, Inc. DE
Airgas Sakhalin Holdings, Inc. DE
Airgas Sakhalin, LLC Russia
Airgas - Southwest, Inc. DE
Airgas Specialty Gases, Inc. TX
Airgas Specialty Products, Inc. DE
Airgas USA, LLC DE
Airgas West, S.A.de C.V. Mexico
A & N Europe B.V. Netherlands
A & N Management Limited UK
Missouri River Holdings, Inc. KS
National Welders Supply Company, Inc. d.b.a.
Airgas National Welders NC
Nitrous Oxide Corp. DE
Radnor Funding Corp. DE
Red-D-Arc, Inc. NV
Red-D-Arc (Netherlands) B.V. Netherlands
Red-D-Arc (FR) SAS France
Red-D-Arc (U.K.) Limited UK
Red-D-Arc Limited Canada
Red-D-Arc S.A.de C.V. Mexico
Tools Plus, Inc. CA
WorldWide Welding, LLC DE