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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If misclassified as other sulfonic acid inorganic salts
Chapter note 3(C)(1) mandates organic compound heading, preventing Chapter 28 classification.
If for use in direct dye formulations
Once incorporated into finished coloring matter, exclusion (g) applies shifting to Chapter 32.
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Import Tips & Compliance
• Specify 'disodium salt' and provide sodium analysis (typically 2 Na per molecule)
• Monitor for hydration state; dihydrate forms common and affect weight declarations
• Include downstream dye manufacturing end-use statement to support intermediate classification
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.
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.