Fluorescent Brightener OB-1
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as synthetic fluorescent brightening agent specifically
Heading 3204.20 covers fluorescent brightening agents/luminophores, separate from general coloring matter.
If masterbatch with polymer carrier
Brighteners premixed with plastics become additive preparations in Chapter 38.
If inorganic-based or used as luminophore
Chapter note allows inorganic luminophores in 3206, differing from purely synthetic organic.
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Import Tips & Compliance
• 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
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