| Abbreviation | Definition |
|---|---|
| SEBS | Styrene Ethylene Butylene Styrene |
| SEEPS | Styrene Ethylene Ethylene Propylene Styrene |
| SI | Silicone |
| SIS | Styrene Isoprene Styrene |
| SKP | Sin Kwang Plastic |
| SLCPP | Smooth Lined Corrugated Plastic Pipe |
| SLK | Slick |
| SMA | Poly (Styrene Maleic Anhydride) |
| SMC | Sheet Molding Compound |
| SPC | Small Plastic Container |
| SPDIP | Shrink Plastic Dual Inline Package |
| SPE | Society of Plastics Engineers |
| SPI | Society of the Plastics Industry |
| SPNC | Syracuse Plastics of North Carolina |
| SPU | Segmented PolyUrethane |
| SR | Sticky Rubber |
| SSU | Singe Stage Urethane |
| STW | Service Thermoplastic Waterproof |
| SUPD | Single Use Plastics Directive |
| TAIC | Triallyl Isocyanurate |