Tolylenediamine (2,4-Diaminotoluene)
Tolylenediamine is an aromatic polyamine used primarily as an intermediate in polyurethane production and as a curing agent for epoxy resins. It falls under HTS 2921.59.80.90 as an aromatic polyamine derivative not specifically enumerated elsewhere in the subheading. This chemically defined compound meets Chapter 29 note (a) for separate organic compounds.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If o-phenylenediamine structure
Specific aromatic polyamines like o-phenylenediamine have dedicated subheadings earlier in numerical order per Chapter 29 classification rule.
If imported as formulated mixture exceeding 70% concentration
Chemical mixtures not qualifying as separate compounds under Chapter 29 note (a) fall into prepared chemical preparations.
If aromatic toluidines without second amino group
Single amine-function aromatic compounds classify under Chapter 29 heading 2902 rather than polyamines.
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Import Tips & Compliance
• Provide Safety Data Sheets (SDS) and chemical purity certificates to verify classification under Chapter 29
• Comply with TSCA pre-manufacture notification if introducing new uses in the US
• Avoid misclassification as Chapter 27 hydrocarbons by confirming amine functional groups
Related Products under HTS 2921.59.80.90
4,4'-Methylenedianiline (MDA)
4,4'-Methylenedianiline is a reactive aromatic diamine used in the production of high-performance polymers and as a curing agent. Classified under HTS 2921.59.80.90 as 'other' aromatic polyamines and derivatives. Its structure contains two aromatic amine groups connected by methylene bridge.
m-Phenylenediamine (1,3-Diaminobenzene)
m-Phenylenediamine is an aromatic diamine used in epoxy resin curing, polyimide production, and as a dye intermediate. It qualifies under HTS 2921.59.80.90 as an 'other' aromatic polyamine meeting Chapter 29 purity requirements. The meta-positioned amino groups define its polyamine classification.
Benzidine Dihydrochloride
Benzidine dihydrochloride is the salt form of the aromatic tetraamine benzidine, used historically in dye manufacturing. It falls under HTS 2921.59.80.90 per Chapter 29 note on organic salts classifying with parent amine. The hydrochloride salt maintains aromatic polyamine identity.
4,4'-Diaminodiphenyl Ether (ODA)
4,4'-Diaminodiphenyl ether (oxydianiline, ODA) is an aromatic diamine used in high-performance polyimide and polyetherimide production. Classified under HTS 2921.59.80.90 as other aromatic polyamine derivative. The ether linkage between aromatic rings maintains polyamine classification.
p-Phenylenediamine Sulfate
p-Phenylenediamine sulfate is the salt form used in oxidative hair dyes and rubber accelerator production. HTS 2921.59.80.90 classification follows Chapter 29 salt rule placing it with parent aromatic polyamine. Para positioning provides specific reactivity profile.
2,2'-Dichlorobenzidine
2,2'-Dichlorobenzidine is a halogenated aromatic tetraamine used as a dye intermediate and analytical reagent. Falls under HTS 2921.59.80.90 as aromatic polyamine derivative per Chapter 29 note on halogenated derivatives. Dual chlorine substitution enhances reactivity.