3,3'-Dimethylbenzidine (o-Tolidine)
3,3'-Dimethylbenzidine, commonly known as o-Tolidine, is an aromatic polyamine used primarily as an intermediate in the production of azo dyes and pigments. It falls under HTS 2921.59.0800 as a specifically named aromatic polyamine derivative. This chemical is supplied in pure form or with stabilizers for safe transport.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not exactly matching the named compounds
General 'other' aromatic polyamines fall here if they don't match the specific enumerated substances in 2921.59.0800.
If pre-reacted into synthetic dye intermediate
Once converted to azo dye components, it moves to Chapter 32 synthetic organic coloring matter.
If imported as mixture with solvents for safety
Per Chapter 29 note (e), solutions in solvents for transport may shift to mixtures of Chapter 38 if not qualifying under exceptions.
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Import Tips & Compliance
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm identity as o-Tolidine matching HTS description
• Include Material Safety Data Sheet (MSDS) detailing toxicity and handling; ensure proper HAZMAT declaration for transport
• Avoid misclassification as general polyamine (2921.59.2000); specific naming requires exact match to listed compounds
Related Products under HTS 2921.59.08.00
3,3'-Dimethylbenzidine Hydrochloride
This is the hydrochloride salt form of 3,3'-Dimethylbenzidine, explicitly named in HTS 2921.59.0800, used in dye synthesis and analytical chemistry. The salt form enhances solubility and stability for industrial applications. It qualifies as an aromatic polyamine derivative salt under Chapter 29.
4,4'-Diamino-3-biphenylsulfonic Acid (3-Benzidinesulfonic Acid)
A sulfonated aromatic polyamine used as a dye intermediate, specifically listed under HTS 2921.59.0800. It features two amine groups and a sulfonic acid function on a biphenyl structure. Classified here as it qualifies as a derivative of aromatic polyamines.
5-Amino-2-(p-aminoanilino) Benzenesulfonic Acid
This complex aromatic polyamine with sulfonic acid substitution is explicitly named in HTS 2921.59.0800 for use in azo dye coupling. It contains multiple amine functions connected via anilino linkage on a benzenesulfonic acid core. Fits Chapter 29 as a chemically defined aromatic polyamine derivative.
4,4'-Methylenebis(2-chloroaniline)
Known as MOCA, this di-chloro substituted aromatic polyamine is listed in HTS 2921.59.0800, used as a curing agent in polyurethane production. Features methylene bridge between two chloroaniline units. Strictly controlled due to carcinogenicity but classified as aromatic polyamine.
Ethyl-(2-dimethylaminoethyl) Aniline
A tertiary amine derivative specifically enumerated in HTS 2921.59.0800, used as a dye intermediate and photographic chemical. Contains ethyl-aniline backbone with dimethylaminoethyl substituent. Qualifies as aromatic polyamine per Chapter 29 definitions.
N-Ethyl-N,N'-Dimethyl-N'-Phenylethylenediamine
Complex polyamine derivative listed under HTS 2921.59.0800, serving as an antioxidant in polymers and dye intermediate. Features ethylenediamine core with ethyl, dimethyl, and phenyl substituents. Pure compound classification under aromatic polyamines.