| Exhibit 21 | ||
| NAME OF SUBSIDIARY | JURISDICTION OF ORGANIZATION | |
| Compugraphics International Limited | United Kingdom | |
| Compugraphics Jena GmbH | Germany | |
| Compugraphics U.S.A. Inc. | Delaware | |
| Cyantek Corporation | Delaware | |
| Diehl & EaglePicher GmbH | Germany | |
| EaglePicher Energy Products ULC | Canada | |
| EaglePicher Medical Power, LLC | Delaware | |
| EaglePicher Technologies, LLC | Delaware | |
| EPEP Holding Company, LLC | Delaware | |
| Groupement Pour Le Traitement Du Terril De Lubumbashi Limited (55%) | Jersey, Channel Islands | |
| Harko CV | Netherlands | |
| Key Professional Services Ltd. | Gibraltar | |
| Neorem Magnets Ningbo Co. Ltd. (58.9%) | China | |
| Neorem Magnets Oy | Finland | |
| O.M.G. Chemicals (S) Pte. Ltd. | Singapore | |
| OM Group (Suzhou) Electronic Chemicals Co., Ltd. | China | |
| OM Group Ultra Pure Chemicals Limited | United Kingdom | |
| OM Group Ultra Pure Chemicals Pte. Ltd. | Singapore | |
| OM Group Ultra Pure Chemicals SAS | France | |
| OM Group Ultra Pure Chemicals Sdn. Bhd. | Malaysia | |
| OMG (Asia) Electronic Chemicals Co., Ltd. | Taiwan | |
| OMG (Shanghai) Trading Co., Ltd. | China | |
| OMG (Suzhou) Electronic Chemicals Co., Ltd. | China | |
| OMG Additives Ltd. | United Kingdom | |
| OMG Americas, Inc. | Ohio | |
| OMG Belleville Limited | Ontario | |
| OMG Borchers GmbH | Germany | |
| OMG Borchers SAS | France | |
| OMG Electronic Chemicals (M) Sdn Bhd | Malaysia | |
| OMG Electronic Chemicals Pte. Ltd. | Singapore | |
| OMG Electronic Chemicals, LLC | Delaware | |
| OMG Energy Holdings, Inc. | Delaware | |
| OMG Europe GmbH | Germany | |
| OMG Finland Oy | Finland | |
| OMG France SARL | France | |
| OMG Germany Holding GmbH | Germany | |
| OMG Harjavalta Chemicals Holding BV | Netherlands | |
| OMG Harko Holdings, LLC | Delaware | |
| OMG Japan, Inc. | Japan | |
| OMG Kokkola Chemicals Holding (Two) BV | Netherlands | |
| OMG Kokkola Chemicals Oy | Finland | |
| OMG UK Limited | United Kingdom | |
| OMG UK Technology Limited | United Kingdom | |
| SANVAC (Beijing) Magnetics Co., LTD (49%) | China | |
| Societe Congolaise Pour le Traitement du Terril de Lubumbashi SPRL (49%) | Democratic Republic of Congo | |
| VAC Beteiligungs-GmbH | Germany | |
| VAC Finanzierung GmbH | Germany | |
| VAC Germany GmbH | Germany | |
| VAC International Holding GmbH | Germany | |
| VAC Magnetic Finland Oy | Finland | |
| VAC Magnetic France S.a.r.l. | France | |
| VAC Magnetic Japan K.K. | Japan | |
| VAC Magnetic Korea Ltd. | Korea | |
| VAC Netherlands B.V. | Netherlands | |
| VAC Participation GmbH | Germany | |
| VAC Sales USA LLC | Delaware | |
| Vacuumschmelze (Malaysia) Sdn. Bhd. | Malaysia | |
| Vacuumschmelze China Magnetics (Shenyang) Co., Ltd. | China | |
| Vacuumschmelze GmbH & Co. KG | Germany | |
| Vacuumschmelze Singapore Pte. Ltd. | Singapore | |
| Vacuumschmelze, s.r.o. | Slovakia | |