1,8-Dihydroxynaphthalene-3,6-disulfonic acid (H Acid) from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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