Dye Coupling Grade Naphthalenetrisulfonic Acid Isomer Mix from Canada
Specialty isomer mixture (1,3,6- and 1,3,7-naphthalenetrisulfonic acids) optimized for diazo coupling in azo pigment production. HTS 2904.10.15.00 applies as chemically defined sulfonated naphthalene derivative per Chapter 29 exclusions from dyes.
Duty Rate — Canada → United States
15.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Request supplier Certificate of Analysis specifying <0.5% impurities to maintain Chapter 29 chemical compound status
• Avoid retail packaging; bulk industrial shipments prevent shift to Chapter 32 retail dye provisions
• Check REACH compliance documentation for EU-origin material destined for US transshipment