| Product | Generic | Company |
| Wah Hong BMC | TS, Unspecified | Wah Hong Industrial Corp. |
| Wah Hong DAP | DAP | Wah Hong Industrial Corp. |
| Wah Hong UP | Polyester Alloy | Wah Hong Industrial Corp. |
| WaterClear™ | Epoxy | DSM Somos® |
| WaterShed™ | TS, Unspecified | DSM Somos® |
| Weatherflex™ | TPE | Colorite Polymers |
| WeatherPro™ | ABS+Acrylic, ABS+ASA+Acrylic | Spartech Plastics |
| Wellamid® | Nylon 6, Nylon 66, Nylon 66/6, Nylon+PP | Wellman Engineering Resins |
| WellPet® | PET | Wellman Engineering Resins |
| WEP | Polyester, TS | Ashland Specialty Chemical |
| Westlake | ABS, Acetal (POM) Copolymer, ASA, ETFE, HDPE, Ionomer, Nylon 46, PES, PK, PMP, Polyarylate, PS (HIPS), PVDF | Westlake Plastics Company |
| Westlake HDPE | HDPE | Westlake Chemical Corporation |
| Westlake LDPE | LDPE, LDPE+EVA | Westlake Chemical Corporation |
| Westlake LLDPE | LLDPE | Westlake Chemical Corporation |
| Westlake MDPE | MDPE | Westlake Chemical Corporation |
| Westlake PVC | PVC, Rigid, PVC, Unspecified | Westlake Chemical Corporation |
| WEVO-CHEMIE Epoxy | Epoxy | WEVO-CHEMIE GmbH |
| WEVO-CHEMIE Polyurethanes | PUR, Unspecified | WEVO-CHEMIE GmbH |
| WINTEC® | PP Random Copolymer | 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 Copolymer, PP Impact Copolymer, 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 Copolymer, PP Homopolymer, PP Impact Copolymer, PP, HMS, PP, Unspecified | Washington Penn Plastic Co. Inc. |
| WPP TPO | Polyolefin, Unspecified | Washington Penn Plastic Co. Inc. |
| WR® | PEEK | Greene, Tweed & Co. |
