Chamber Process Sulfonitric Acid from United States
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.
Duty Rate — United States → Canada
Import Tips
• 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