1-Naphthol-3,6-disulfonic acid
Also known as 1,4-dihydroxy-2,7-naphthalenedisulfonic acid or H-acid in dye chemistry, this compound is explicitly listed under HTS 2908.99.0300. It features a naphthol structure with two sulfo groups, classifying as a sulfonated phenol derivative containing only sulfo groups. Critical intermediate for reactive dyes used in textiles.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If emphasized as ether-function derivative rather than sulfonated phenol
Multi-function compounds classify to last numerical heading, potentially shifting from 2908 to 2909.
If when imported as 20-30% aqueous solution for dye manufacturing
Solutions exceeding simple transport form per note (e) become Chapter 38 preparations.
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Import Tips & Compliance
• Use trade name 'H-acid' with chemical synonyms on documentation for customs recognition
• Ensure pH stability in transport; acid form requires corrosion-resistant packaging
• Batch testing for isomer purity critical, as chapter note (b) excludes certain isomer mixtures
Related Products under HTS 2908.99.03.00
2,5-Dihydroxybenzenesulfonic acid potassium salt
This is a specific sulfonated derivative of dihydroxybenzene (resorcinol) in the form of its potassium salt, explicitly listed under HTS 2908.99.0300. It features only sulfo groups attached to the phenolic structure, qualifying it for this chapter's heading for halogenated, sulfonated, nitrated or nitrosated derivatives of phenols. Used primarily as an intermediate in dye synthesis and chemical manufacturing.
3,6-Dihydroxy-2,7-naphthalenedisulfonic acid
A naphthalene-based compound with two hydroxy groups and two sulfo groups, explicitly named in HTS 2908.99.0300 as a sulfonated derivative of phenols or phenol-alcohols containing only sulfo groups. This chemically defined organic compound serves as a key intermediate for azo dye production. Its classification follows chapter note prioritizing last numerical heading for multi-function compounds.
3,6-Dihydroxy-2,7-naphthalenedisulfonic acid sodium salt
The sodium salt form of this specific naphthalenedisulfonic acid, directly listed under HTS 2908.99.0300 for sulfonated phenol derivatives containing only sulfo groups. As a salt of an organic sulfo acid, it classifies with the parent acid per chapter note 3(C)(1). Commonly used in textile dye manufacturing.
4-Hydroxy-1-naphthalenesulfonic acid sodium salt
Sodium salt of 4-hydroxy-1-naphthalenesulfonic acid (also known as Laurent's acid salt), explicitly provided for in HTS 2908.99.0300. This sulfonated naphthol derivative contains only sulfo groups and qualifies as a chemically defined compound of chapter note (a). Essential intermediate for direct and reactive dyes.
2-Naphthol-3,6-disulfonic acid disodium salt
The disodium salt of 2-naphthol-3,6-disulfonic acid (R-acid salt), specifically provided for in HTS 2908.99.0300. This sulfonated naphthol derivative contains only sulfo groups and their salts, qualifying under the chapter's provisions for chemically defined organic compounds. Used in manufacturing acid dyes.