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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not exactly matching listed compounds
Other aromatic polyamines fall in catch-all 2921.59.90; listed specifics get 2921.59.17.
If containing heterocyclic nitrogen ring
Heterocyclic compounds take precedence over acyclic/aromatic amines per chapter hierarchy.
If sold as lab reagent mixture
Retail lab preparations exclude from Chapter 29 per exclusions.
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Import Tips & Compliance
• Include polymerization inhibition certificates if stabilized for transport
• High purity grades (>98%) require HPLC chromatograms for duty verification
• Prevent oxidation during shipping; use nitrogen-purged containers
Related Products under HTS 2921.59.17.00
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.
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.
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.