4-Amino-3-hydroxy-1-naphthalenesulfonic acid from Germany
This specifically named aminohydroxynaphthalenesulfonic acid under HTS 2922.21.1000 serves as a building block for direct dyes and metal complex dyes. Contains required amino, hydroxy, and sulfonic functions on naphthalene core. Technical grade 90%+ purity standard.
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
• Position-specific isomer verification via LC-MS essential
• Biuret test confirms absence of urea impurities from synthesis
• Customs lab testing common for novel naphthalenedisulfonic isomers