Alcan Chemicals

Almatis

AluChem, Inc.

Calucem

C-E Minerals, Inc.

Christy Minerals Company

Cometals

Electro Abrasives Corp.

Fibercon International Inc.

Great Lakes Minerals

Kerneos, Inc.

Kyanite Mining Corporation

Maryland Refractories Company

Possehl Erzkontor N.A.

Refractory Minerals Co., Inc.

Resco Products, Inc.

Ribbon Technology Corporation

Sintertec

Steel Valley Firebrick

Treibacher Schleifmittel North America, Inc.

U.S. Electrofused Minerals, Inc.

Washington Mills Electro Minerals Corp.