| Product | Generic | Company |
| Xantar® | PC | DSM Engineering Plastics |
| Xantar® C | ABS+PC | DSM Engineering Plastics |
| Xarec® | PS+SPS, SPS | Idemitsu Chemicals |
| XENOY* | ABS+PBT+PC, PBT, PBT+PET, PC+PBT, PC+PET, PC+Polyester | SABIC Innovative Plastics SABIC Innovative Plastics Asia Pacific SABIC Innovative Plastics Europe
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| Xiran® | SMA | Polyscope Polymers BV |
| Xmod™ | PP Copolymer, PP Homopolymer, PP Impact Copolymer, PP, High Crystal, PP, Unspecified | Borealis A/S |
| X-Off | TP, Unspecified, TS, Unspecified | Patent Plastics Inc. |
| XPD8® | Proprietary | RBM Polymers, Inc. |
| XT® Polymer | Acrylic (PMMA) | Evonik CYRO LLC |
| Xtel® | PPS, PPS Alloy | Chevron Phillips Chemical Company LLC |
| XU | PC | Dow Plastics |
| XYCOMP® | PEEK | Greene, Tweed & Co. |
| Xydar® | LCP | Solvay Advanced Polymers |
| XYFLUOR® | Fluorelastomer | Greene, Tweed & Co. |
| XYLEX* | PC+Polyester | SABIC Innovative Plastics SABIC Innovative Plastics Asia Pacific SABIC Innovative Plastics Europe
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| Xyron™ | Nylon+PPE, PPE+PP, PPE+PS, PPE+PS+Nylon, PPE+PS+PP, PPS+PPE | Asahi Kasei Corporation Asahi Kasei Plastics North America Inc.
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