1-Naphthylamine-8-sulfonic Acid (Peri Acid) from Mexico
Peri acid is a monosulfonic derivative of 1-naphthylamine used in azo dye production for textiles. It falls under HTS 2921.45.90.90 as an unspecified derivative of α-naphthylamine, maintaining classification in the amine-function heading. The sulfonic acid enhances water solubility without altering the core amine classification.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Certify via mass spectrometry that it's specifically the 8-isomer; positional isomers may have different statistical reporting
• Avoid aqueous solutions > standard concentrations, as they may fall outside Chapter 29 note (d)
• Document end-use as chemical intermediate, not finished dye product, to prevent Chapter 32 misrouting