1,8-Dihydroxynaphthalene-3,6-disulfonic acid (H Acid) from Mexico
Pure 1,8-Dihydroxynaphthalene-3,6-disulfonic acid, known as H Acid, is a key intermediate for azo dye synthesis. This sulfonated phenol derivative falls under HTS 2908.99.0900 due to its specific chemical structure with only sulfo groups and its disodium salt form being explicitly named in the tariff.
Duty Rate — Mexico → United States
15.5%
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
• Provide detailed chemical analysis certificates confirming purity and structure match to avoid misclassification
• Ensure SDS (Safety Data Sheets) comply with HAZMAT regulations for sulfonated organic acids
• Verify import licenses for dye precursors if destined for textile or pigment manufacturing