| 2511 | | Natural barium sulfate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816: | | | | |
| 2522 | | Quicklime, slaked lime and hydraulic lime, other than calcium oxide and hydroxide of heading 2825: | | | | |
| 2801 | | Fluorine, chlorine, bromine and iodine: | | | | |
| 2801.10.00 | 00 | Chlorine | kg | Free | | 25% |
| 2801.20.00 | 00 | Iodine | kg | Free | | Free |
| 2801.30 | | Fluorine; bromine: | | | | |
| 2801.30.10 | 00 | Fluorine | kg | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2801.30.20 | 00 | Bromine | kg | 5.5% | Free (A+,AU,BH, CA,CL,D,E,IL,J, JO,MA,MX, P,SG) | 37% |
| 2802.00.00 | 00 | Sulfur, sublimed or precipitated; colloidal sulfur | t | Free | | Free |
| 2803.00.00 | | Carbon (carbon blacks and other forms of carbon not elsewhere specified or included) | | Free | | 20% |
| 2803.00.00 | 10 | Carbon black | kg | | | |
| 2803.00.00 | 50 | Other | kg | | | |
| 2804 | | Hydrogen, rare gases and other nonmetals: | | | | |
| 2804.10.00 | 00 | Hydrogen | thousand m3 | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2804.21.00 | 00 | Rare gases: | | | | |
| 2804.21.00 | 00 | Argon | thousand m3 | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2804.29.00 | | Other | | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2804.29.00 | 10 | Helium | thousand m3 | | | |
| 2804.29.00 | 50 | Other | thousand m3 | | | |
| 2804.30.00 | 00 | Nitrogen | thousand m3 | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2804.40.00 | 00 | Oxygen | thousand m3 | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2804.50.00 | | Boron; tellurium | | Free | | 25% |
| 2804.50.00 | 10 | Boron | kg | | | |
| 2804.50.00 | 20 | Tellurium | kg | | | |
| 2804.61.00 | 00 | Silicon: | | | | |
Harmonized Tariff Schedule of the United States inquiry: 3203Ã
