Sodium Salt of 2-Naphthylamine-6-sulfonic Acid from Mexico
The sodium salt form of Schaeffer's acid maintains the amine-function classification of the parent acid per Chapter 29 salt note (C)(1). Explicitly covered under HTS 2921.45.25.00 for named naphthylamine sulfonic acid salts. Commonly used in aqueous dye coupling processes.
Duty Rate — Mexico → United States
10%
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
• Specify counterion (Na+) and assay % on CoA; double salts may require separate review
• Package in 25kg PE-lined fiber drums; avoid glass for corrosive solutions
• Test for heavy metals (<10ppm) to meet TSCA import notification standards