1 HARSCO CORPORATION EXHIBIT 21 Subsidiaries of the Registrant: Country of Ownership Name Incorporation Percentage - ---- ------------- ---------- Heckett MultiServ SAIC Argentina 100% MetServ Holdings Pty. Limited Australia 55% MetServ (Australasia) Pty. Ltd. Australia 70% MetServ Victoria Pty. Ltd. Australia 70% MetServ Pty. Ltd. Australia 55% Harsco (Australia) Pty. Limited Australia 100% Fairmont Tamper (Australia) Pty. Limited Australia 100% Taylor-Wharton (Australia) Pty. Limited Australia 100% Alu Serv Middle East W.L.L. Bahrain 65% Heckett MultiServ S.A. Belgium 100% Heckett MultiServ Russia S.A. Belgium 100% Loyquip Holdings S.A. Belgium 100% Societe D'Etudes et D'Administration Belgium 100% des Enterprises S.A. Fortuna Insurance Limited Bermuda 100% Harsco (Bermuda) Limited Bermuda 100% Sociedade Brasileria de Recuperacao Brazil 100% de Metals (Sobremetal) Ltda Comercio de Rejeitos Industriais Ltda Brazil 100% Harsco Canada Limited Canada 100% Heckett Technology Services Canada, Inc. Canada 100% Heckett MultiServ S.A. Chile 100% MultiServ Wuhan Co. Ltd. China 100% MultiServ Jiangxi Co. Ltd. China 100% MultiServ s.r.o. Czech Republic 100% Heckett MultiServ Bahna S.A.E. Egypt 65% Metalsider S.A.S. France 51% Heckett MultiServ France S.A. France 100% Floyequip S.A. France 100% PyroServ France 100% Heckett MultiServ Sud S.A. France 100% Carbofer International GmbH Germany 100% Heckett MultiServ GmbH Germany 100% Harsco GmbH Germany 100% Axil International Ltd. Ireland 100% IMS Servizi Spa Italy 100% MultiServ SRL Italy 100% ILSERV SRL Italy 65% Luxequip Holdings S.A. Luxembourg 100% Heckett MultiServ S.A. Luxembourg 100% Societe Luxembourgoiese D'Interim S.A. Luxembourg 100% Taylor-Wharton Asia (M) SDN. BHD. Malaysia 70% -1- 2 Country of Ownership Name Incorporation Percentage - ---- ------------- ---------- Irving, S.A. de C.V. Mexico 100% Heckett Mexicana, S.A. de C.V. Mexico 100% Andamios Patentados, S.A. de C.V. Mexico 100% Servicios Industriales Siderurgicos, Mexico 100% S.A. de C.V. Electroforjados Nacionales, S.A. de C.V. Mexico 100% Heckett MultiServ International N.V. Netherlands 100% Heckett MultiServ Finance B.V. Netherlands 100% Heckett MultiServ China B.V. Netherlands 100% Heckett MultiServ Far East B.V. Netherlands 100% Harsco Europa B.V. Netherlands 100% Heckett MultiServ (Holland) B.V. Netherlands 100% Heckett MultiServ AS Norway 100% Heckett MultiServ Saudi Arabia Limited Saudi Arabia 55% MultiServ Slovensko SPOL s r.o. Slovakia Republic 100% FerroServ (Pty.) Limited South Africa 100% Heckett MultiServ (South Africa) (Pty.) Ltd. South Africa 51% MultiServ Lycrete S.A. Spain 100% Serviequipo S.A. Spain 100% MultiServ Intermetal S.A. Spain 100% MultiServ Iberica S.A. Spain 100% Heckett MultiServ Reclamet S.A. Spain 100% Gestion Materias Ferricas, S.A. Spain 85% Heckett MultiServ Nordiska AB Sweden 100% Heckett MultiServ plc U.K. 100% Heckett MultiServ Ltd. U.K. 100% MultiServ Overseas Ltd. U.K. 100% Quipco Ltd. U.K. 100% Harsco (U.K.) Ltd. U.K. 100% The Permanent Way Equipment U.K. 100% Company Limited Tamper Corp. (U.K.) Limited U.K. 100% Heckett International Services Limited U.K. 100% Heckett Limited U.K. 100% Heckett MultiServ Corporation U.S.A. 100% Heckett MultiServ Inc. U.S.A. 100% Heckett MultiServ U.S. Corp. U.S.A. 100% Heckett MultiServ Operations Ltd. U.S.A. 100% Heckett MultiServ General Corp. U.S.A. 100% Heckett MultiServ Intermetal Inc. U.S.A. 100% Heckett Technology Services Inc. U.S.A. 100% Harsco Defense Holding, Inc. U.S.A. 100% Harsco Foreign Sales Corporation U.S. Virgin Islands 100% Heckett MultiServ MV + MS Venezuela 100% Heckett MultiServ Investment Corporation U.S.A. 100% -2- 3 Companies in which Harsco Corporation does not have majority ownership are not consolidated. These companies are listed below as unconsolidated entities: Country of Incorporation/ Ownership Name Organization Percentage - ---- ------------ ---------- Ferro Scrap Nigam Ltd. India 40% P.T. Purna Baja Heckett Indonesia 40% IKG-Salcon SDN. BHD. Malaysia 50% Nutter-Niro Ingenieria S.A. de C.V. Mexico 49% United Defense, L.P. U.S.A. 40% -3-