Fluorescent Brightener OB-1 from China
Fluorescent Brightener OB-1 (CAS 1533-45-5) is a synthetic organic stilbene derivative used as an optical brightening agent in polyester fibers and plastics. Falls under HTS 3204.19.50.00 as other synthetic products used as fluorescent brightening agents per heading scope. Absorbs UV light and emits blue fluorescence for whiteness enhancement.
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
• Provide fluorescence emission spectra (peaks at 430nm) and application data to confirm brightener function vs. regular dye
• Ensure not chemically defined as pure compound (Chapter 29 exclusion); commercial grade mixtures qualify here