| • 3M Company | • Chemplex Industries | • Inplex | • Poly Pipe Industries |
| • A&E Plastics | • Clear Pack | • J.P. Stevens | • Ponca Pellets |
| • Aaron Equipment | • CNC (China National Chemical) | • Jarrow Products | • Portage Industries |
| • ABC Colorants | • Coleco | • K & M Plastics | • PPC Industries |
| • Abell-Howe | • Collins & Aikinan | • K. W. Plastics | • PPG Industries |
| • Action Technology | • Colonial Rubber | • Kar-Rite International | • Prescon Corp. |
| • Advance Color | • Commercial Vinyls | • Keyes Fibre | • Primex Plastics |
| • Advanced Drainage Systems | • Compounding Technology | • Kimberly-Clark | • Quality Films |
| • Advanced Electric | • Concord Industries | • KM Plastics | • Quick Plastics |
| • Aim Packaging | • Conrad Company | • K-S-H Canada | • Reed Plastics |
| • Allied Resinous Products | • Consumer Plastics | • Lambda Markt. | • Republic Packaging Corp. |
| • Amanco | • Container Corporation | • Louisiana-Pacific | • Research/Dexter |
| • American Cable | • Continental Can | • Lucky Goldstar Korea | • Rexene |
| • American Sheet | • Co-Poly-Ex | • Lustro Plastics | • Reynolds Metals. |
| • American Thermoplastics | • Creative Packaging | • Matsui | • Rock Ten |
| • Amoco Fibers | • Cross Color | • Maynard Plastics | • San Juan Plastics |
| • Ampacet Corporation | • CTI | • McCreary | • Sanderson Plumbing |
| • Applied Plastics | • Custom Tapes | • Mercer Plastics | • Schulman, A. |
| • Applied Products | • Daelim Co. | • Midwest Recycling | • Shannon Ind. |
| • ATC | • Dande Plastics, Inc. | • Mitsubishi Heavy Industries | • Signode Corp. |
| • B & L Bauliauis Holland | • Detroit Forming. | • Monsanto | • Silite |
| • B & M Plastics | • DOT Plastics | • MRC Polymers | • So. Polymers |
| • B. P. Polymers | • Dow Chemical | • National Seal | • Stevens, J.P., & Co. |
| • Balco Plastics | • Dupont Company | • Northern Pipe Products | • Storm Products |
| • Bee Polymer | • East Jordan Plastics | • Nova Chernical Company | • Swift Adhesives |
| • Bethlehem Steel | • Eastern Balance | • Owens - Illinois | • Tecknor Apex |
| • Blachford Corporation | • Easton Chemical | • P & M Industries | • Tenneco PCA Division |
| • Blako | • EKCO/PCA Products | • Pace Industries | • Tetra Plastics/Now Nike Uretha |
| • Bredero Price | • Entek Prod. | • Pantasote | • Textrude |
| • British Petroleum Industries | • Ex-Tech | • PC Plastics | • Thermofil |
| • C.R.C. Evans | • Fabri-Kal Corporation | • PCA | • Travenol |
| • Cadillac Plastics | • Ferro Corporation | • Peacock Colors | • U.C. Industries |
| • Canterbury Engineering | • Ford Motor | • Performance Packaging | • Union Carbide |
| • Carlon Co. | • Formed Products | • Phillips Petroleum | • United States Gypsum |
| • Cascade Plastics | • General Foam | • Plasticolors | • Upjohn |
| • Cassa Ind. | • Great Lakes Chemical | • Plasticos Espumados | • Videx |
| • Celanese International | • Graber Ind. | • Plastiques Cascades | • Vinyl Plastics |
| • Central Nebraska/lTS | • Hendrickson | • Plastofilm Industries | • Wilkinson |
| • Champion Blower | • Hercules | • Plexco | • Wilson Fiberfil |
| • Champion Infiltrator | • Hills McCanna/Prescon | • Plicofiex | |
| • Chemical Resins | • Inline Plastics | • PolyAmerica |