| Manufacturer | Phone | State | Country |
| S&E Specialty Polymers, LLC | 978-537-8261 | MA | USA |
SABIC Innovative Plastics  | 800-845-0600 | MA | USA |
| SABIC Innovative Plastics Asia Pacific | 86-21-3222-4500 | - | China |
| SABIC Innovative Plastics Europe | 31-164-292911 | - | Netherlands |
| Saint Gobain - Norton | - | - | - |
| Saint Gobain Performance Plastics | - | - | - |
| Salflex Polymers Ltd. | 1-416-741-0273 | - | Canada |
| Sam Yang Co., Ltd. | 82-2-740-7114 | - | Korea |
| SAMSUNG TOTAL PETROCHEMICALS Co., Ltd. | 82-41-660-6114 | - | Korea |
| Samsung, a division of Cheil Industries | 82-2-527-2401 | - | Korea |
| SASOL Polymers | 27-11-790-1412 | - | South Africa |
| Saudi Basic Industries Corporation (SABIC) | 966-1-225-8000 | - | Kingdom of Saudi Arabia |
| SAX Polymers | 43/1/2559900 | - | Austria |
| SCG Chemicals Co., Ltd. | 66-2586-4184 | - | Thailand |
| Schwartz Technical Plastic | 724-778-3310 | PA | USA |
| Sebi Innovative Compounds | 0331/836.011 | - | Italy |
| SEETEC | (82) 2-398-6600 | - | Korea |
| Sekisui (Hong Kong) Limited | 852-28909161 | - | - |
| Sekisui Chemical Company, Ltd. | 800-866-4005 | NY | USA |
| SENOPLAST USA, Inc. | 877-736-6872 | IL | USA |
| Shakespeare Monofilaments and Specialty Polymers | 800-845-2110 | SC | USA |
| Shanghai Jing Qi Polymer Science Co. (SJPS) | - | - | China |
| Shannon Industrial Corporation | 815-337-2349 | IL | USA |
| Shell Chemical Company | 800-872-7435 | TX | USA |
| Shin-A Corporation | 82-2-589-6800 | - | Korea |
| Shincor Silicones, Inc. | 330-630-9460 | OH | USA |
| Shinkong Synthetic Fiber Corp. | 886-2-2507-1251 | - | Taiwan |
| Shuman Plastics, Inc. | 716-685-2121 | NY | USA |
| Sidpec (Sidi Kerir Petrochemicals Co.) | 203-477-0131 | - | Egypt |
| Silicones, Inc. | 800-533-8709 | NC | USA |
| Singapore Polymer Corporation (Pte) Ltd | +(65) 6-265 2544 | - | Singapore |
| SINOPEC Qilu Co., Ltd. Plastics Institute | 86-533-751148 | - | China |
| SINOPEC Shanghai Petrochemical Co. Ltd. | (8621) 57941941 | - | China |
| SK Chemicals | 201-613-8000 | NJ | USA |
| SK Corporation | 82-2-2121-6922 , 7332 | - | South Korea |
| Slovnaft, a.s. | 421/2/5859 1111 | - | Slovakia |
| SO.F.TER. SPA | +39 0543 790411 | - | Italy |
| Soarus L.L.C. | - | - | - |
| Solutia Inc. | 888-927-2363 | MO | USA |
| Solvay Advanced Polymers | 800-621-4557 | GA | USA |
| Solvay Benvic | 32-2509-6111 | - | Belgium |
| Solvay Solexis, Inc. | 800-323-2874 | NJ | USA |
| Solvay Specialities India Private Limited (SSIPL) | 91-22-2438-5564 | - | India |
| SolVin S.A. | - | - | Belgium |
| Soredi s.r.l. | 39-3070-56611 | - | Italy |
| Sorensen Ventures | 877-807-3200 | CA | USA |
| SORI S.P.A. | 0377-51363 | - | - |
| Southland Polymers | 562-921-0444 | CA | USA |
| Spartech Plastics | 888-721-4242 | MO | USA |
| Spartech Polycom | 800-538-3149 | PA | USA |
| SPDC Ltd. | - | - | Japan |
| Specialty Coating Systems (SCS) | 800-356-8260 | IN | USA |
| STAR Thermoplastic Alloys & Rubbers, Inc. | 312-225-7800 | IL | USA |
| StarPet Inc. | 336-672-0101 | NC | USA |
| Sterigenics International, Inc. | 858-271-6330 | CA | USA |
| SumiDurez Singapore Pte Ltd | 65-6265-1717 | - | Thailand |
| SUMINISTROS PLASTICOS EUROPEOS, S.A. | 93-776-53-84 | - | Spain |
| Sumitomo Bakelite Co., Ltd. | - | - | Japan |
| Sumitomo Chemical Co., Ltd. | 281-298-7779 | TX | USA |
| Sunoco Chemicals, Polymers Division | 800-223-8871 | PA | USA |
| Supreme Petrochem Ltd. | (022) 631 1839 | - | India |
| Suzano Petroquímica S.A. | 55-11-3583-5917 | - | Brazil |
| SWANCOR IND. CO., LTD. | 886-49-2255420 | - | Taiwan |
| Sylvin Technologies Incorporated | 800-462-4781 | PA | USA |
