p,p'-Diaminostilbene from China
p,p'-Diaminostilbene is an aromatic polyamine featuring a stilbene backbone, used in optical brighteners. As a derivative not covered by prior 2921.59 subheadings, it is classified in HTS 2921.59.80 under the last applicable amine-function heading.
Duty Rate — China → United States
44%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• UV spectral data confirms stilbene chromophore distinguishing from simple diphenylamines
• Check fluorescent properties; may trigger 3204 reclassification if brightener-formulated
• Documentation must emphasize chemical intermediate status over end-use