Air Products and Chemicals Inc. 7201 Hamilton Blvd., Allentown PA 18195. Telephone: 215/481-4911; 800/345-3148. FAX: 215/481-5900.

Alox Corporation. 3943 Buffalo Ave. Niagara Falls, NY 14302. Telephone: 716/282-1295. FAX 716/282-2289.

Ampco Metal, Inc. 1745 S. 38th St. Box 2004 Milwaukee, WI 53215. Telephone: 800/844-6008. FAX: 414/645-6466.

Aqualon Co. (Division of Hercules, Inc). PO Box 15417, 2711 Centerville Rd. Wilmington, DE 19850-5417. Telephone: 302/996-2000; 800/345-8104. FAX: 302/996-2049. Canada: 5407 Eglington Avenue. West Suite 103, Etobicoke, ON, M9C 5K6. Telephone: 416/620-5400. UK: Genesis Centre, Garrett Field, Birchwood, Warrington, Cheshire, WA3 7BH. Telephone: (Country code 44) 925 83 00 77.

Atlas Minerals % Chemicals Co. PO Box 38, 1227 Valley road, Mertztown, PA 19539. Telephone: 800/523-8269. FAX: 610/682-9200.

Atochem North America Inc. Three Parkway, Philadelphia 19102. Telephone: 215/-587-7000; 800/225-7788. FAX 215/587-7591.

Barium and Chemicals Inc. County Rd. 44, Box 218 Steubenville, OH 43952. Telephone: 740/282-9776. Web: http://www.bariumchemicals.com

Cabot Corp. (1) 300 Holly Rd. Boyertown, PA 19512-1807. (2) P.O. Box 188, Tuscola IL 61953. Telephone 217/253-3370; 800/222-6745. FAX: 217/253-4334. UK: Carbon Division: Lees Lane, Stanlow, South Wirral, Merseyside, L65 4HT. Telephone: (Country code 44) 051 355 36 77. FAX 051 356 07 12.

Calgon Corp. PO Box 1346, Pittsburgh, PA 15230. Telephone: 412/777-8000. FAX 412/777-8927.

The Carborundum Co. (subsidary of BP America, Inc.) PO Box 156, 345 Third Street, Niagara Falls NY 14302. Telephone: 716/278-2000. FAX 716/278-2900.

Chemtronics, Inc. 8125 Cobb Center Drive, Kennesaw GA 30144. Telephone: 800/645-5244. FAX 404/424-4267.

Cytec Industries, Inc., 5 Garret Mountain Plaza, West Patterson NJ 07424.