1,3,6/1,3,7-Naphthalenetrisulfonic Acid Technical Grade from Canada
Technical grade mixture of 1,3,6- and 1,3,7-naphthalenetrisulfonic acid used in industrial dye synthesis. Falls under HTS 2904.10.15.00 per Chapter 29 scope for sulfonated hydrocarbon derivatives with only sulfo groups, excluding coloring matters of Chapter 32.
Duty Rate — Canada → United States
15.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Include CAS registry verification and isomer ratio HPLC analysis in import documentation to confirm HTS 2904.10.15.00 specificity
• Obtain EPA pre-manufacture notice if used in US dye production exceeding reportable quantities