PQ Corporation
               http://www.pq.com
Corporate Headquarters

http://www.pqcorp.com
               P.O. Box 840
              Valley Forge, PA 19482-0840
              Tel:  (610) 651-4200
              Fax: (610) 651-4504
Research & Development Center
              280 Cedar Grove Road
              Conshohocken, PA 19428-2240
              Tel:  (610) 651-4600
              Fax: (610) 825-1421

Potters Industries Inc
            http://www.pottersbeads.comads.com

Ballotini Panamericana, S.A.
             http://www.potters.com.br

National Silicates

http://www.silicates.com