1,3,6/1,3,7-Naphthalenetrisulfonic Acid Technical Grade
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If purely 1,3,6-naphthalenetrisulfonic acid without 1,3,7 isomer
Pure single isomers have distinct subheadings from isomer mixtures in heading 2904.10.
If converted to corresponding sodium salts
Organic acid salts classified with parent acid per Chapter 29 note on inorganic salts of organic compounds.
If for industrial use in direct azo dye coupling processes
Functional use in specific dye processes may shift to Chapter 32 synthetic coloring matter.
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Import Tips & Compliance
• 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
Related Products under HTS 2904.10.15.00
Naphthyltrisulfonic Acid Mixture (1,3,6 & 1,3,7 Isomers)
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.
Dye Coupling Grade Naphthalenetrisulfonic Acid Isomer Mix
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.
1,3,6-1,3,7-NTS Acid for Acid Dyes
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.
Industrial Naphthalene-1,3,6,7-Trisulfonic Acid Blend
Industrial-grade 50/50 blend of 1,3,6- and 1,3,7-naphthalenetrisulfonic acids for synthetic dye production. Classifies under HTS 2904.10.15.00 as the explicitly named mixture of these sulfonated hydrocarbon derivatives.