Nitrosylsulfuric Acid (HNSO5) from Japan
Nitrosylsulfuric acid (HNSO5), also known as chamber acid, is a chemically defined inorganic compound with the formula HNO2SO4 or [NO]+[HSO4]-. It is a sulfonitric acid, which is expressly included in tariff item 2808.00.00. The product is not an organic compound, so it falls within Chapter 28, and its chemical definition is clear under the chapter notes.
Duty Rate — Japan → Canada
Import Tips
• Provide the chemical formula and a certificate of analysis to confirm the product is nitrosylsulfuric acid, not a mixture of nitric and sulfuric acids
• Check if the product is subject to import controls under the Chemical Weapons Convention; if so, a permit from Global Affairs Canada may be required
• Ensure the product is properly packaged and labelled as a corrosive substance to comply with CBSA and transport regulations