| 2711.13.00 | | Butanes | | Free | | Free |
| 2711.13.00 | 10 | Butanes with a purity of 90 liquid volume percent or more, but less than 95 liquid volume percent | bbl | | | |
| 2711.29.00 | 20 | Butanes: | | | | |
| 2711.29.00 | 20 | Butanes with a purity of 90 liquid volume percent or more, but less than 95 liquid volume percent | bbl | | | |
| 2901.10.10 | 00 | Ethane and butane | kg | Free | | Free |
| 2903.19.05 | 00 | 1,2-Dichloropropane (Propylene dichloride) and dichlorobutanes | kg | 5.1% | Free (A,AU,BH,CA, CL,E,IL,J,JO, MA,MX,P,SG) | 33.3% |
| 2926.30 | | Fenproporex (INN) and its salts; Methadone (INN) intermediate (4-cyano-2-dimethylamino-4,4- diphenylbutane): | | | | |
| 2926.30.20 | 00 | 4-Cyano-2-dimethylamino-4,4-diphenylbutane | kg | 6.5% | Free (A+,AU,BH, CA,CL,D,E,IL,J, JO,MA,MX,P) 2.9% (SG) | 15.4¡é/kg + 65.5% |
| 2931.00.70 | 00 | N,N'-Bis(trimethylsilyl)urea; 3-(Hydroxymethylphosphinyl)-1-propanoic acid, 2-hydroxyethyl ester; and 2-Phosphonobutane-1,2,4-tricarboxylic acid and its salts | kg | Free | | 25% |
| 9613.80.10 | 40 | Butane | No. | | | |
