• Atlas Minerals & Chemicals, Inc.

• Bonstone Materials Corporation

• Covercrete Flooring Systems

• Dylon Industries

• Glass Blocks Unlimited

• Huston Clay Products Co.

• IMCO Industrial & Marine Coatings Ltd.

• IPW

• International Chimney Corp.

• Justin Industries

• Lafarge Calcium Aluminates

• Nemato Composites Inc.

• Pocono Fabricators

• R. H. Tamlyn & Sons

• Rick's Custom Fencing & Decking

• Shope Reno Wharton Associates

• Sioux City Brick and Tile Company

• Stark Ceramics, Inc.

• Surebond

• W.R. Grace & Co.

• Western Concrete Products Co.