4,4'-Benzidine-2,2'-Disulfonic Acid
4,4'-Benzidine-2,2'-disulfonic acid is a specific aromatic polyamine derivative with two sulfonic acid groups, explicitly listed under HTS 2921.59.1700. It is a chemically defined organic compound used primarily as an intermediate in dye and pigment synthesis.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as a salt of the acid
Salts of aromatic polyamines are classified separately under 2921.59.2000 per Chapter 29 note on inorganic salts of organic compounds.
If further processed into synthetic dye
Once converted to finished synthetic organic coloring matter, it moves to Chapter 32, excluding separate compounds from Chapter 29.
If imported as mixture with solvents exceeding transport allowances
Solutions beyond Chapter 29 note (e) limits for safety/transport fall under mixtures in Chapter 38.
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Import Tips & Compliance
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm it matches the exact compound listed in the HTS description
• Ensure packaging complies with DOT/UN hazardous material regulations as it may be classified as corrosive due to sulfonic acid groups
• Avoid misclassification as a dye intermediate under Chapter 32; include lab test results showing it's a separate chemical compound
Related Products under HTS 2921.59.17.00
4,4'-Methylene bis(2,6-Diethylaniline)
This diarylamine compound featuring a methylene bridge between two substituted aniline rings is explicitly covered by HTS 2921.59.1700 as an aromatic polyamine. It functions as an antioxidant intermediate and polymer modifier.
m-Xylene Diamine
m-Xylene diamine (2,4-diaminotoluene) is a meta-substituted xylylene diamine explicitly listed under HTS 2921.59.1700 for aromatic polyamines. It is widely used in epoxy resin curing agents and polyimide synthesis.
3,3'-Diaminobenzidine (Tetraaminobiphenyl)
3,3'-Diaminobenzidine, a tetrafunctional aromatic polyamine also called tetraaminobiphenyl, is named in HTS 2921.59.1700. It is essential for polybenzimidazole polymers and high-performance engineering plastics.
4,4'-Methylene bis(2,6-Diisopropylaniline)
This sterically hindered diarylamine with isopropyl substituents is specifically identified in HTS 2921.59.1700. It functions as a high-performance antioxidant stabilizer for polyolefins and synthetic lubricants.
4,4'-Methylene bis(3-Chloro-2,6-Diethylaniline)
A chlorinated derivative of methylene dianiline explicitly listed under HTS 2921.59.1700, featuring both chloro and ethyl substituents. Used in specialty polymer antioxidants and flame retardant synergists.
1,4-Diaminobenzene-2-Sulfonic Acid
Also known as 4-amino-2-aminobenzenesulfonic acid, this aromatic diamine with a sulfonic acid substituent is specifically named in HTS 2921.59.1700. It serves as a key building block for azo dyes and pharmaceutical intermediates.