1,3,6-1,3,7-NTS Acid for Acid Dyes from Mexico
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 — 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
• 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