8-Amino-1-naphthol-5-sulfonic acid (Schaeffer's acid) from Japan
Schaeffer's acid is explicitly named in HTS 2922.21.1000 and functions as a dye intermediate for acid wool dyes and reactive dyes. Its sulfonic acid group enhances water solubility while maintaining coupling reactivity. Commonly imported at 96% minimum assay.
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
• Isomer-specific NMR spectrum confirms identity versus gamma acid or other isomers
• Anti-caking agent declaration required if >1% added (permitted by chapter note 1(f))
• Temperature-controlled shipping prevents degradation above 40°C