4,4'-Thiodianiline
4,4'-Thiodianiline contains sulfur linkage between aromatic amine rings, used in rubber chemicals and polymer synthesis. HTS 2921.59.80.90 applies as it qualifies as aromatic polyamine rather than organo-sulfur compound per Chapter 29 note exclusion. Sulfur maintains thioether functionality.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified primarily as organo-sulfur
Chapter 29 notes give organo-sulfur compounds (2930) precedence over amines.
If pre-reacted as rubber accelerator
Prepared rubber accelerators classify under Chapter 38 regardless of purity.
If carboxylated derivative predominates
Oxygen and carboxy functions take precedence per Chapter 29 note sequence.
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Import Tips & Compliance
• Elemental analysis confirming amine > sulfur functionality required
• Odor control packaging essential due to volatile sulfur compounds
• Rubber chemical end-use declaration prevents dye intermediate misclassification
Related Products under HTS 2921.59.80.90
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.
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.