| Business | Phone |
| Tribotrix Plastics Research 11020 Solway School Rd, Knoxville 37931 | (865) 927-0045 |
| Republic Plastics 5316 S National Dr, Knoxville 37914 | (865) 637-7732 |
| P & S Engineered Plastics 10600 Dutchtown Rd, Knoxville 37932 | (865) 966-6793 |
| M P Plastics Inc 638 Maryville Pike, Knoxville 37920 | (865) 573-2425 |