p,p'-Diaminostilbene from Canada
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 — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
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