| 3M Company |
A&E Plastics |
| Aaron Equipment |
ABC Colorants |
| Abell-Howe Company |
Action Technology |
| Advance Color |
Advanced Drainage Systems |
| Advanced Electric |
Aim Packaging |
| Album Extrusions |
Allied Resinous Products |
| Amanco |
American Cable Company |
| American Cyanamid |
American Motors Company |
| American Sheet |
American Thermoplastics |
| Amoco Fibers |
Ampacet Corporation |
| Applied Plastics |
Applied Products |
| AT&T Company |
ATC Company |
| ATE Inc. |
B&L Bauliauis Holland |
| B&M Plastics |
B.P. Polymers |
| Balco Plastics |
BASF Germany |
| Bee Polymer |
Bethlehem Steel |
| Blachford Corporation |
Blacko Inc. |
| Boyle Midway |
Bredero Price Co. |
| British Petroleum Industries |
C.R.C. Evans |
| Cadillac Plastics |
Canaco Plastics |
| Canterbury Engineering Company Inc. |
Carlon Company |
| Cascade Plastics |
Cassa Industries |
| Celanese International |
Central Nebraska / ITS |
| Champion Blower Company |
Champion Infiltrator |
| Chemical Resins Company |
Chemplex Industries |
| Clear Pack Company |
CNC (China National Chemical) |
| Coleco Company |
Collins & Aikinan |
| Colonial Rubber |
Commercial Vinyls Inc. |
| Compounding Technology Inc. |
Concord Industries |
| Conrad Company |
Consumer Plastics |
| Container Corporation |
Continental Can Company |
| Co-Poly-Ex |
Creative Packaging Company |
| Crest Mfg. |
Cross Color |
| Crowe Rope Company |
CTI Inc. |
| Custom Tapes Inc. |
Daelim Company |
| Dande Plastics |
Detroit Forming Inc. |
| DOT Plastics |
DOW Chemical |
| DSM Engineering Plastics |
DuPont Company |
| East Jordan Plastics |
Eastern Balance |
| Easton Chemical Company |
EKCO/PCA Products |
| Entek Products |
Ex-Tech |
| Fabri-Kal Corporation |
Federal Sign and Signal Company |
| Ferro Corporation |
Flex-o-glass Inc. |
| Ford Motor |
Formed Products |
| General Foam |
General Motors Company |
| Great Lakes Chemical Co. |
Graber Industries |
| Gulf Plastics |
Hendrickson |
| Hercules |
Hills McCanna/Prescon |
| Inline Plastics |
Inplex Inc. |
| J.P. Stevens Company |
Jarrow Products Inc. |
| Joliet Equipment Corp. |
K&M Plastics Inc. |
| K.W. Plastics |
Kar-Rite International |
| KE Plastics, Recycling Division |
Keyes Fibre |
| Kimberly-Clark |
KM Plastics |
| K-S-H Canada Inc. |
Lab-Line Instruments Inc. |
| Lambda Markt. |
Louisiana-Pacific |
| Lucky Goldstar Korea |
Lustro Plastics Company |
| Matsui Company |
Maynard Plastics |
| McCreary Industries |
Mercer Plastics |
| Midwest Recycling |
Mitsubishi Heavy Industries |
| Monsanto Company |
MRC Polymers Inc. |
| National Seal Company |
NCI Inc. |
| Newman-Green Inc. |
Nike |
| Norris Industries |
Northern Pipe Products |
| Northern Plastics Company |
Nova Chemical Company |
| Objective Industries Inc. |
Owens - Illinois Inc. |
| P&M Industries |
Pace Industries |
| Pantasote |
PC Plastics Inc. |
| PCA |
Peacock Colors Inc. |
| Pemex Company (Mexico) |
Performance Packaging Inc. |
| Phillips Petroleum |
Plasticolors Inc. |
| Plasticos Espumados |
Plastiques Cascades |
| Plastofile Industries Inc. |
Plexco Inc. |
| Plicofiex Corp. |
Ponca Pellets |
| Poly Pipe Industries Inc. |
PPC Industries Inc. |
| Portage Industries Corp. |
Prescon Corp. |
| PPG Industries Inc. |
Quality Films Inc. |
| Primex Plastics |
R. Plastics Company |
| Quick Plastics |
Republic Packaging Corp. |
| Reed Plastics Inc. |
Research/Dexter |
| Research Polymers |
Reynolds Metals Company |
| Rexene Company |
Rockwell International Corp. |
| Rock Ten Company |
S&H Pipe |
| Ryan Development Company |
Sanderson Plumbing |
| San Juan Plastics |
Shannon Industries |
| Schulman, A. Inc. |
Signal Division of American Amerace |
| Shell |
Silite Company |
| Signode Corp. |
Spacemakes Company |
| So. Polymers Inc. |
Storm Products |
| Stevens, J.P. & Company Inc. |
Swift Adhesives |
| Swedlow Corporation |
Tenneco PCA Division |
| Tecknor Apex Inc. |
Tetra Plastics/Now Nike Uretha |
| Tetra Plastics Inc. |
Textrude Company |
| Texi Colors Inc. |
Travelnol Inc. |
| Thermofil Inc. |
U.C. Industries |
| Trirutex Company Inc. |
Uniroyal Company |
| Union Carbide Corp. |
Upjohn Company |
| United States Gypsum Company |
Vacu-Maid Company |
| USS Chemicals |
Vinyl Plastics Inc. |
| Videx Company |
Wilson Fiberfil Inc. |
| Wilkinson Company |
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| Xaloy Inc. |
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