2-Naphthylamine-1-sulfonic Acid (Tobias Acid)
Tobias Acid is the 1,2-isomer used in reactive dye synthesis for cotton textiles. HTS 2921.45.90 covers it as 'other' β-Naphthylamine derivative; salts thereof. Chapter 29 notes confirm amine-function precedence over sulfonation.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If specific named derivative in statistical note
Certain commercial naphthylamine derivatives have dedicated suffixes.
If reactive dyes containing this moiety
Chapter exclusion moves finished reactive dyes to 3204.16.
If containing sugar ether modification
Sugar-modified derivatives classify under heading 2942 per chapter notes.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Specify 1-sulfonic vs 6-sulfonic (Laurent's) isomer; CAS 84-89-9 critical
• Often imported as sodium salt; declare salt form explicitly
• Reactive dye manufacturers prefer >99% purity; test certificates prevent disputes
Related Products under HTS 2921.45.90
4-Amino-1-naphthalenesulfonic Acid
4-Amino-1-naphthalenesulfonic acid is a derivative of 1-naphthylamine with a sulfonic acid group attached, classified under HTS 2921.45.90 as an 'other' aromatic monoamine derivative and salt thereof. It is primarily used as an intermediate in the production of azo dyes and pigments.
1-Naphthylamine-4,8-disulfonic Acid (C Acid)
C Acid is a disulfonated derivative of 1-naphthylamine used extensively in azo dye synthesis for textiles and leather. It falls under HTS 2921.45.90 as an 'other' derivative of 1-Naphthylamine per Chapter 29 amine-function compounds. The naphthalene ring with amino group maintains its primary classification.
2-Naphthylamine-6-sulfonic Acid (Laurent's Acid)
Laurent's Acid is a sulfonated derivative of 2-naphthylamine (β-Naphthylamine) used in manufacturing acid dyes and pharmaceuticals. Classified under HTS 2921.45.90 as 'other' aromatic monoamine derivatives; salts thereof in Chapter 29. The retained naphthylamine structure governs classification over sulfonation.
1-Naphthylamine-8-sulfonic Acid (Peri Acid)
Peri Acid serves as a dye intermediate for naphthol AS dyes used in textile coloration. It qualifies under HTS 2921.45.90 as an 'other' 1-Naphthylamine derivative per Chapter 29's amine-function compounds. The peri-position sulfonic acid maintains aromatic monoamine classification.
N-Phenyl-1-Naphthylamine
N-Phenyl-1-naphthylamine (Neozone D) acts as an antioxidant and stabilizer in rubber and lubricant formulations. It classifies under HTS 2921.45.90 as a derivative of 1-Naphthylamine (aromatic monoamine). The secondary amine structure on naphthalene ring fits Chapter 29 perfectly.
1-(Phenylamino)naphthalin-8-sulfonic Acid
This N-phenyl substituted peri acid derivative serves in acid dye manufacture. Falls under HTS 2921.45.90 as 'other' 1-Naphthylamine derivative per amine-function classification rules. Dual functionality but retains Chapter 29 status.