5-Sulfosalicylic Acid from Mexico
5-Sulfosalicylic acid (5-hydroxy-2-sulfobenzoic acid) is listed in HTS 2918.29.04.00 despite sulfonation, as a specific exception for phenolic carboxylic acids. Widely used for protein precipitation and iron testing in labs.
Duty Rate — Mexico → United States
15.8%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Declare sulfonic acid position and content; ensure solution not for specific use per note (e); common pitfall is classifying as general sulfonated in 2918.19