| Product | Generic | Company |
| WaterClear™ | Epoxy | DSM Somos® |
| WaterShed™ | TS, Unspecified | DSM Somos® |
| WearRing | PEEK | Greene, Tweed & Co. |
| Weatherflex™ | TPE | Colorite Polymers |
| WeatherPro™ | ABS+ASA+Acrylic | Spartech Plastics |
| WELLAMID® | Nylon 6, Nylon 66, Nylon 66/6, Nylon, Unspecified, Nylon+PP, Polyester Alloy | Wellman, Inc. |
| WELLAMID® EcoLon® | Nylon 6, Nylon 66, Nylon, Unspecified | Wellman, Inc. |
| WELLPET® | PET | Wellman, Inc. |
| WEP | Polyester, TS | Ashland Specialty Chemical |
| Westlake | ABS, Acetal (POM) Copoly, ASA, ETFE, HDPE, Ionomer, Nylon 46, PES, PK, PMP, Polyarylate, PS (HIPS), PVDF | Westlake Plastics Company |
| Westlake EVA | EVA | Westlake Chemical Corporation |
| Westlake HDPE | HDPE | Westlake Chemical Corporation |
| Westlake LDPE | LDPE | Westlake Chemical Corporation |
| Westlake LLDPE | LLDPE | Westlake Chemical Corporation |
| Westlake MDPE | MDPE | Westlake Chemical Corporation |
| WINTEC® | PP Random Copoly | Japan Polychem Corporation |
| Wondel® A | Nylon 66 | Nanjing Julong Engineering Plastics Co., LTD |
| Wondel® B | Nylon 6 | Nanjing Julong Engineering Plastics Co., LTD |
| Wondel® C | ABS+PC, PC, PC Alloy | Nanjing Julong Engineering Plastics Co., LTD |
| Wondel® P | PP, Unspecified | Nanjing Julong Engineering Plastics Co., LTD |
| Wondel® S | ABS | Nanjing Julong Engineering Plastics Co., LTD |
| Wondel® T | PBT | Nanjing Julong Engineering Plastics Co., LTD |
| WONDERLITE® | PC | CHI MEI CORPORATION |
| WONDERLOY® | ABS+PC | CHI MEI CORPORATION |
| World Bright | PET | PolyPak International |
| WPP | PP Copoly, PP Impact Copoly, PP, Unspecified, TP, Unspecified | Washington Penn Plastic Co. Inc. |
| WPP ABS | ABS | Washington Penn Plastic Co. Inc. |
| WPP PE | HDPE, LLDPE, MDPE, PE, Unspecified | Washington Penn Plastic Co. Inc. |
| WPP PP | PP Copoly, PP Homopoly, PP Impact Copoly, PP, HMS, PP, Unspecified | Washington Penn Plastic Co. Inc. |
| WPP TPO | Polyolefin, Unspecified | Washington Penn Plastic Co. Inc. |
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