Fuming Sulfonitric Acid Mixture
A fuming sulfonitric acid solution combining concentrated nitric acid (HNO3) and sulfuric acid (H2SO4) in nitrosylsulfuric form, used in nitration processes. Classified under HTS 2808.00.00.20 as it meets the definition of sulfonitric acids per Chapter 28 notes for chemically defined inorganic acids.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for pure sulfuric acid component dominance
If sulfuric acid proportion exceeds nitric forming nitrosylsulfuric, it might shift to 2807, but Chapter 28 prioritizes sulfonitric mixed nature.
If containing phosphides or other Chapter 28 inclusions like cyanogen halides
Heading 2853 covers other inorganic compounds including certain acid derivatives excluded from main acid headings per chapter notes.
If sold as stabilized industrial grade with organic additives
Additives for stabilization make it an organo-inorganic compound excluded by Chapter Note 2(b), classified as chemical preparation.
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Import Tips & Compliance
• Submit assay reports showing nitrosylsulfate content > specific threshold to confirm sulfonitric classification over plain nitric acid
• Use UN 1791 classification for transport; ensure tanks are acid-resistant and include emergency response plans
• Avoid misdeclaration as 'mixed acid' which could trigger 3824 reclassification; maintain 99%+ purity records
Related Products under HTS 2808.00.00.20
Nitrosylsulfuric Acid (HNSO5)
Nitrosylsulfuric acid, also known as chamber acid or sulfonitric acid, is a chemically defined inorganic compound with the formula HNO2SO4 or [NO]+[HSO4]-. It falls under HTS 2808.00.00.20 as a sulfonitric acid, a mixed acid containing both nitric and sulfuric acid functionalities, classified in Chapter 28 for inorganic acids.
Chamber Process Sulfonitric Acid
Sulfonitric acid produced via the chamber process for sulfuric acid manufacturing, existing primarily as nitrosylsulfuric acid. It is classified in HTS 2808.00.00.20 as a sulfonitric acid, distinct from pure nitric acid under the same heading.
Industrial Nitrosulfuric Acid Solution 98%
A 98% pure aqueous solution of nitrosylsulfuric acid used in organic synthesis and explosives manufacturing. Falls under HTS 2808.00.00.20 as a chemically defined sulfonitric acid per Chapter 28 definitions, excluding organo-inorganic mixtures.