p-Isopropoxydiphenylamine (UOP 288)
p-Isopropoxydiphenylamine is a substituted diphenylamine derivative serving as a high-performance antioxidant for synthetic rubber and plastics. Classified under HTS 2921.44.2000 due to its inclusion in additional U.S. note 3 to section VI, which controls imports of certain rubber chemical intermediates. It provides thermal and oxidative stability in tire compounds.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified by heterocyclic structure
Certain ether-containing diphenylamine derivatives might be interpreted as heterocyclic compounds under heading 2933 if oxygen linkage dominates classification.
If imported as prepared chemical additive
If pre-mixed with stabilizers or carriers for rubber industry use, it becomes a prepared chemical under Chapter 38.
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Import Tips & Compliance
• Monitor U.S
• ITC quota usage reports monthly to time imports effectively
• Provide CAS number (101-72-4 equivalent structure) and technical data sheets for customs verification
• Avoid misdeclaration as general chemical mixtures which triggers different Chapter 38 tariffs
Related Products under HTS 2921.44.20.00
N-Phenyl-1-Naphthylamine (Neozone D)
N-Phenyl-1-naphthylamine is an aromatic amine derivative of diphenylamine used primarily as an antioxidant and stabilizer in rubber and tire production. It falls under HTS 2921.44.2000 as a derivative of diphenylamine specifically listed in additional U.S. note 3 to section VI for chemical products with controlled import volumes. This compound prevents oxidative degradation in polymers during manufacturing.
Octylated Diphenylamine
Octylated diphenylamine consists of mono- and di-octyl substituted derivatives used as antioxidants in lubricating oils and rubber products. It qualifies for HTS 2921.44.2000 as a diphenylamine derivative specified in additional U.S. note 3 to section VI for import quota management. The alkyl substitution enhances solubility and performance in petroleum applications.
4,4'-Di-alpha-cumyl Diphenylamine
This sterically hindered diphenylamine derivative acts as a premium antioxidant for natural and synthetic rubber, extending service life in tires and belts. HTS 2921.44.2000 applies due to its listing in additional U.S. note 3 to section VI, subjecting it to quantitative import restrictions. The cumyl groups provide superior heat aging resistance.
Monomethyldiphenylamine
Monomethyldiphenylamine is a methylated derivative used as an intermediate in dye manufacturing and rubber antioxidants. It falls under HTS 2921.44.2000 per additional U.S. note 3 to section VI, which regulates certain aromatic amine imports. The methyl substitution modifies reactivity for specific polymerization applications.
p,p'-Dicumyldiphenylamine
p,p'-Dicumyldiphenylamine serves as a high-temperature stable antioxidant for synthetic elastomers and petroleum products. Classified in HTS 2921.44.2000 because it's enumerated in additional U.S. note 3 to section VI for quota-controlled diphenylamine derivatives. Its bulky cumyl groups prevent radical chain reactions effectively.