2908.99.03.00/3,6-Dihydroxy-2,7-naphthalenedisulfonic acid/China

3,6-Dihydroxy-2,7-naphthalenedisulfonic acid from China

A naphthalene-based compound with two hydroxy groups and two sulfo groups, explicitly named in HTS 2908.99.0300 as a sulfonated derivative of phenols or phenol-alcohols containing only sulfo groups. This chemically defined organic compound serves as a key intermediate for azo dye production. Its classification follows chapter note prioritizing last numerical heading for multi-function compounds.

Duty Rate — China → United States

40.5%

Rate breakdown

9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 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)
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Import Tips

• Submit NMR or HPLC analysis verifying the exact isomer structure, as chapter note (b) excludes certain isomer mixtures

• Confirm absence of halogen or nitro groups through testing to maintain classification in the 'sulfo groups only' subheading

• Declare CAS number (specifically 581-86-2) and molecular formula on commercial invoice for accurate HTS verification