Chicago Acid Sodium Salt from Japan
Sodium salt of 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid) specifically enumerated in HTS 2922.21.1000. Widely used in reactive dye synthesis for cotton. The salt formation follows chapter note 3(C)(1) classification with parent acid.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Sodium/potassium salt differentiation requires cation analysis
• Free sulfonic acid content <2% prevents acidity disputes
• DTA/TGA confirms thermal stability for container shipment