Schaeffer's Salt (2-Naphthylamine-6-sulfonic Acid)
Schaeffer's salt is a sodium salt of 2-naphthylamine-6-sulfonic acid, a key aminohydroxynaphthalenesulfonic acid derivative used primarily as an intermediate in azo dye synthesis. It falls under HTS 2922.21.4000 as a product described in additional U.S. note 3 to section VI, which covers specific organic compounds subject to quota restrictions for dye production. The compound features both amino and sulfonic acid oxygen functions on a naphthalene ring.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing more than one kind of oxygen function beyond amino-hydroxy-sulfonic
Compounds with multiple oxygen functions (e.g., additional carboxyl groups) classify under amine-function compounds in 2921 per chapter notes.
If imported as finished synthetic dye rather than dye intermediate
Chapter note excludes finished coloring matter; dyes go to chapter 32, not chapter 29 intermediates.
If imported as mixture or solution exceeding chapter 29 solvent/stabilizer allowances
Solutions beyond safety/transport exceptions classify as chemical preparations in 3824.
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Import Tips & Compliance
• Verify inclusion in additional U.S. note 3 to section VI and obtain necessary quota certificates from U.S
• Customs prior to import
• Provide detailed chemical analysis and CAS number (118-01-4) documentation to confirm classification as an aminohydroxynaphthalenesulfonic acid salt
• Avoid common pitfalls by ensuring purity levels meet chapter 29 requirements for chemically defined organic compounds, preventing reclassification
Related Products under HTS 2922.21.40.00
Tobias Acid (2-Naphthylamine-8-sulfonic Acid)
Tobias acid is the sodium salt of 2-naphthylamine-8-sulfonic acid, widely used as a diazo component in manufacturing acid dyes and pigments. Classified under HTS 2922.21.4000 due to its status in additional U.S. note 3 to section VI, restricting imports for dye production. It qualifies as an oxygen-function amino-compound with amino, hydroxy, and sulfonic groups.
Bayer's Acid Salt (1-Naphthylamine-4-sulfonic Acid Sodium Salt)
Bayer's acid sodium salt serves as a crucial intermediate for direct and reactive dyes, featuring the aminohydroxynaphthalenesulfonic acid structure. It is specifically listed under HTS 2922.21.4000 per additional U.S. note 3 to section VI for quota-controlled dye chemicals. The compound's classification follows chapter rules prioritizing oxygen-function amino-phenols.
Neville-Winter Acid (1-Naphthylamine-5-sulfonic Acid)
Neville-Winter acid is an aminohydroxynaphthalenesulfonic acid used in acid dye manufacturing, subject to HTS 2922.21.4000 quotas under U.S. note 3 to section VI. Its structure with amino group ortho/para to sulfonic acid enables diazotization for azo coupling. Classification adheres to chapter priority for oxygen-function amino-naphthols.
Laurent's Acid (2-Naphthylamine-3,6-disulfonic Acid)
Laurent's acid, a di-sulfonic derivative of 2-naphthylamine, functions as a dye coupler in textile coloration chemistry. Covered by HTS 2922.21.4000 as specified in additional U.S. note 3 for import quotas. Despite two sulfonic groups, it remains classified here due to primary amino-hydroxy-naphthalene structure.
K-acid (4-Amino-5-hydroxynaphthalene-2,7-disulfonic Acid)
K-acid serves as an important coupling component for substantive dyes due to its multiple sulfonic groups enhancing water solubility. HTS 2922.21.4000 applies per U.S. note 3 listing for quota purposes. The compound exemplifies oxygen-function amino-naphthols with salt-forming capability.