| Resin Grade | Manufacturer | Category | Trademark |
|---|---|---|---|
| Witcom PS 2011/267 | Witcom Engineering Plastics B.V. | PS (GPPS) | Witcom PS |
| Witcom PS 2006/086 | Witcom Engineering Plastics B.V. | PS (GPPS) | Witcom PS |
| Witcom PS 6L5 | Witcom Engineering Plastics B.V. | PS (GPPS) | Witcom PS |
| Witcom PS EC-HI | Witcom Engineering Plastics B.V. | PS (HIPS) | Witcom PS |