Naphthyltrisulfonic Acid Mixture (1,3,6 & 1,3,7 Isomers) from Canada
This is a specific mixture of 1,3,6-naphthalenetrisulfonic acid and 1,3,7-naphthalenetrisulfonic acid isomers, classified under HTS 2904.10.15.00 as sulfonated derivatives of hydrocarbons containing only sulfo groups. It serves as a key intermediate in azo dye manufacturing, meeting Chapter 29 note (a) for separate chemically defined organic compounds.
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
• Provide detailed chemical analysis certificates confirming the exact isomer mixture ratio to avoid reclassification under general sulfonated hydrocarbons
• Ensure packaging complies with UN hazardous material regulations for sulfonic acids, including proper labeling for corrosive properties
• Verify no added solvents beyond transport allowances per Chapter 29 note (e),