1 EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT The subsidiaries listed below are, directly or indirectly, wholly-owned and all are consolidated in the financial statements. STATE OR COUNTRY IN WHICH SUBSIDIARY NAME INCORPORATED OR ORGANIZED Alumitech, Inc. Delaware Alumitech of Cleveland, Inc. Delaware Alumitech of Wabash, Inc. Indiana AWT Properties, Inc. Ohio ETS Schaefer Corporation Ohio The Feldspar Corporation North Carolina Pyron Corporation New York Pyron Metal Powders, Inc. Delaware Suzorite Mica Products Inc. Ontario, Canada Suzorite Mineral Products, Inc. Delaware Zemex Fabi-Benwood, LLC North Carolina Zemex Industrial Minerals, Inc. Delaware Zemex Mica Corporation Delaware Zemex U.S. Corporation Delaware