Chicago Acid Sodium Salt from Germany
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 — Germany → United States
10%
Rate breakdown
9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%
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