Chamber Process Sulfonitric Acid
Chamber process sulfonitric acid is a product of the lead chamber process for sulfuric acid manufacture, consisting mainly of nitrosylsulfuric acid. It is a sulfonitric acid, which is expressly included in the wording of tariff item 2808.00.00. The product is an inorganic compound of nitrogen and sulfur, not an organic derivative, so it remains within Chapter 28.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is actually sulfuric acid with only trace amounts of nitrogen compounds
The presence of nitrosylsulfuric acid must be significant; otherwise, it would be classified as sulfuric acid.
If the product is a different inorganic acid not covered by the specific heading
Other inorganic acids are classified under heading 28.11 when they are not expressly named elsewhere.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide a detailed technical specification showing the product is nitrosylsulfuric acid, not a mixture of separate acids, to avoid reclassification under other headings
• Confirm the concentration and stability; if it is diluted with water, ensure it still meets the definition of a sulfonitric acid
• Check if the product is subject to any controlled substances regulations due to its use in chemical synthesis
Related Products under Tariff item 2808.00.00
Azeotropic Nitric Acid 68.5%
Azeotropic nitric acid at 68.5% concentration, a constant-boiling mixture used as a laboratory standard. It is a separate chemically defined compound (HNO3) in aqueous solution, meeting the requirements of Chapter 28 Note 1.
Concentrated Nitric Acid 68%
High-purity nitric acid with 68% concentration, chemically defined as HNO3, used in industrial nitration and metal etching. It is a simple inorganic acid, classified under this tariff item.
Dilute Nitric Acid 10% Solution
A 10% aqueous solution of nitric acid, used for pH adjustment and cleaning. As a dilute solution of a chemically defined compound in water, it falls under Chapter 28 Note 1(b) and is classified in this tariff item.
Electropolishing Nitric Acid 50%
A 50% nitric acid solution formulated for electropolishing stainless steel. The acid base is chemically defined and the solution is simply an aqueous dilution, so it remains within the scope of Chapter 28.
Fuming Nitric Acid 98%
Fuming nitric acid at 98% concentration, containing dissolved nitrogen oxides. It is a form of nitric acid that meets the definition of a separate chemically defined compound, with the dissolved gases considered impurities or stabilizers.
Fuming Sulfonitric Acid Mixture
Fuming sulfonitric acid mixture is a solution of concentrated nitric and sulfuric acids in the form of nitrosylsulfuric acid, used in nitration processes. As a sulfonitric acid, it is specifically named in tariff item 2808.00.00, which covers both nitric acid and sulphonitric acids. The product is inorganic and chemically defined, meeting the criteria of Chapter 28 notes.