1,3,6-1,3,7-NTS Acid for Acid Dyes from Japan
Mixture of naphthalenetrisulfonic acid isomers (1,3,6 & 1,3,7) used as diazo component in acid dye synthesis. Precisely matches HTS 2904.10.15.00 for mixtures of these specific sulfonated derivatives containing only sulfo groups.
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
• Document intended industrial use to distinguish from Chapter 32 exclusions for coloring matters
• Test for heavy metal impurities (<10 ppm) required for dye intermediate import clearance
• Use DOT-approved corrosive packaging; common violation leads to CBP holds