| 2711.14.00 | | Ethylene, propylene, butylene and butadiene | | Free | | Free |
| 2711.14.00 | 30 | Butylene | kg | | | |
| 2901.23.00 | 00 | Butene (Butylene) and isomers thereof | kg | Free | | Free |
| 2905.39.10 | 00 | Butylene glycol | kg | 5.5% | Free (A,AU,BH,CA, CL,E,IL,J,JO, MA,MX, P,SG) | 51% |
| 2910.90.10 | 00 | Butylene oxide | kg | 4.6% | Free (A,AU,BH,CA, CL,E,IL,J,JO, K,MA,MX, P,SG) | 46% |
| 3902.20 | | Polyisobutylene: | | | | |
| 3902.90.00 | 10 | Polybutylene | kg | | | |
| 3907.99.01 | 10 | Polybutylene terephthalate | kg | | | |
