# HTS 2811: Other inorganic acids and other inorganic oxygen compounds of nonmetals:

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Source: [2026 HTS Revision 21 (October 9, 2026)](https://hts.usitc.gov/search?query=2811). Additional duties by country of origin may apply; estimate a shipment's full duty with the tariff calculator: https://geopax.app/tariffs/calculator

## 2811: Other inorganic acids and other inorganic oxygen compounds of nonmetals:

| Code | Description | General | Special | Column 2 | Units |
| --- | --- | --- | --- | --- | --- |
| 2811 | Other inorganic acids and other inorganic oxygen compounds of nonmetals: |  |  |  |  |
|  |   Other inorganic acids: |  |  |  |  |
| 2811.11.00.00 |     Hydrogen fluoride (Hydrofluoric acid) | Free |  | Free | kg |
| 2811.12.00.00 |     Hydrogen cyanide (hydrocyanic acid) | 4.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2811.19 |     Other: |  |  |  |  |
| 2811.19.10.00 |       Arsenic acid | 2.3% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 4.9% | kg |
| 2811.19.30.00 |       Hydrobromic acid | Free |  | 25% | kg |
| 2811.19.61 |       Other | 4.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% |  |
| 2811.19.61.10 |         Sulfamic acid | 4.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2811.19.61.90 |         Other | 4.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
|  |   Other inorganic oxygen compounds of nonmetals: |  |  |  |  |
| 2811.21.00.00 |     Carbon dioxide | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | t |
| 2811.22 |     Silicon dioxide: |  |  |  |  |
| 2811.22.10.00 |       Synthetic silica gel | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2811.22.50.00 |       Other | Free |  | Free | kg |
| 2811.29 |     Other: |  |  |  |  |
| 2811.29.10.00 |       Arsenic trioxide | Free |  | Free | kg |
| 2811.29.20.00 |       Selenium dioxide | Free |  | Free | kg |
| 2811.29.30.00 |       Sulfur dioxide | 4.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2811.29.50.00 |       Other | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
|  |   III. HALOGEN OR SULFUR COMPOUNDS OF NONMETALS |  |  |  |  |