Gamma Acid Azo Coupler
Gamma Acid (2-amino-8-naphthol-3,6-disulfonic acid) couples with diazonium salts to form fast dyes for wool and silk. Classified in HTS 2927.00.40.00 per additional U.S. note 3 for essential azo dye components. Qualifies under chapter notes for chemically defined compounds used in dye synthesis.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 6.5% | +25.0% | 31.5% |
| 🇲🇽Mexico | 6.5% | — | 6.5% |
| 🇨🇦Canada | 6.5% | — | 6.5% |
| 🇩🇪Germany | 6.5% | — | 6.5% |
| 🇯🇵Japan | 6.5% | — | 6.5% |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If considered primarily heterocyclic with ring nitrogen
Chapter notes exclude certain ring compounds from 2932-2934 but may redirect complex heterocycles.
If when finishing-formulated for direct textile application
Processing chemicals beyond pure compounds move to chapter 38.
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Import Tips & Compliance
• Declare CAS number (92-88-6 variant) and purity >95% to match regulatory listings
• Include wastewater treatment plan info if required for dye intermediate permits
• Store below 5°C during transit; thermal instability affects chapter note compliance
Related Products under HTS 2927.00.40.00
Fast Red B Base Diazonium Salt
Fast Red B Base is a diazonium salt used as a diazo component in the production of azo dyes for textile and leather coloring. It falls under HTS 2927.00.40.00 as a product described in additional U.S. note 3 to section VI, which covers specific diazo- and azo-compounds regulated for dye manufacturing. This chemically defined organic compound reacts with couplers to form vibrant red dyes.
Fast Yellow GC Base Diazo Compound
Fast Yellow GC Base is a diazonium salt serving as a key intermediate for yellow azo pigments used in printing inks and paints. Classified under HTS 2927.00.40.00 due to its inclusion in additional U.S. note 3 for specific dye-coupling components. It meets chapter requirements as a separate chemically defined diazo-compound.
Salt 3B Diazonium Salt
Salt 3B is a stabilized diazonium salt used in coupling reactions for scarlet azo dyes applied to cotton fabrics. It qualifies for HTS 2927.00.40.00 as a product listed in additional U.S. note 3 to section VI for regulated dye intermediates. The compound contains necessary stabilizers for safe handling per chapter note (f).
Fast Scarlet B Base
Fast Scarlet B Base functions as a diazo component for producing scarlet shades in direct dyes for cellulosic fibers. This product is described in additional U.S. note 3, placing it in HTS 2927.00.40.00 within the diazo-/azo-compounds heading. It is a separate chemically defined compound suitable for industrial dye synthesis.
H Acid Coupling Component
H Acid (1-amino-8-naphthol-3,6-disulfonic acid) serves as an azo coupling agent for substantive dyes on cotton. Though primarily phenolic, its role in azo dye synthesis links it to products in additional U.S. note 3 under HTS 2927.00.40.00. This chemically defined compound is essential for dye chemistry per chapter scope.
J Acid Diazo Coupler
J Acid (2-amino-8-naphthol-6-sulfonic acid) is a critical coupler for azo dyes producing blue-violet shades on textiles. Included in additional U.S. note 3 products for HTS 2927.00.40.00 as part of diazo-/azo- chemistry intermediates. Meets chapter (a) as separate chemically defined organic compound.