| 2809 | | Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined: | | | | |
| 2809.10.00 | 00 | Diphosphorus pentaoxide | kg | Free | | 25% |
| 2809.20.00 | | Phosphoric acid and polyphosphoric acids | | Free | | Free |
| 2809.20.00 | 10 | Phosphoric acid: | | | | |
| 2809.20.00 | 10 | Fertilizer grade: | | | | |
| 2809.20.00 | 10 | Containing less than 65 percent available diphosphorus pentaoxide (P2O5) equivalents | t | | | |
| 2809.20.00 | 20 | Other | t | | | |
| 2809.20.00 | 30 | Other | t | | | |
| 2809.20.00 | 40 | Polyphosphoric acids | t | | | |
| 2810.00.00 | 00 | Oxides of boron; boric acids | t | 1.5% | Free (A*,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 8.5% |
| 2811 | | Other inorganic acids and other inorganic oxygen compounds of nonmetals: | | | | |
| 2811.11.00 | 00 | Other inorganic acids: | | | | |
| 2811.11.00 | 00 | Hydrogen fluoride (Hydrofluoric acid) | kg | Free | | Free |
| 2811.19 | | Other: | | | | |
| 2811.19.10 | 00 | Arsenic acid | kg | 2.3% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 4.9% |
| 2811.19.30 | 00 | Hydrobromic acid | kg | Free | | 25% |
| 2811.19.60 | | Other | | 4.2% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2811.19.60 | 05 | Hydrogen cyanide | kg | | | |
| 2811.19.60 | 10 | Sulfamic acid | kg | | | |
| 2811.19.60 | 90 | Other | kg | | | |
| 2811.21.00 | 00 | Other inorganic oxygen compounds of nonmetals: | | | | |
| 2811.21.00 | 00 | Carbon dioxide | t | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2811.22 | | Silicon dioxide: | | | | |
| 2811.22.10 | 00 | Synthetic silica gel | kg | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2811.22.50 | 00 | Other | kg | Free | | Free |
Harmonized Tariff Schedule of the United States inquiry: no
