4,4'-Dinitrostilbene-2,2'-disulfonic acid
4,4'-Dinitrostilbene-2,2'-disulfonic acid is a sulfonated and nitrated derivative of the hydrocarbon stilbene, featuring two nitro groups and two sulfonic acid groups. It is classified under HTS 2904.99.35.00 as a specific chemically defined organic compound within the category of sulfonated, nitrated, or nitrosated hydrocarbons. This compound serves primarily as an intermediate in dye synthesis.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If further processed into synthetic azo dye
Once converted to finished synthetic coloring matter like direct dyes, it moves from Chapter 29 intermediates to Chapter 32 finished dyes.
If classified as other heterocyclic compound
Alternative interpretation of stilbene ring system as heterocyclic could place it under 2934, though 2904 takes precedence per chapter note on latest numerical order.
If imported as mixture with solvents or stabilizers
Solutions or mixtures exceeding Chapter 29 specifications fall under 3824 as chemical preparations rather than pure compounds.
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Import Tips & Compliance
• Provide detailed chemical analysis and Certificate of Analysis (CoA) confirming purity and identity as 4,4'-Dinitrostilbene-2,2'-disulfonic acid to match HTS 2904.99.35.00 exactly
• Include Safety Data Sheet (SDS) and ensure packaging complies with DOT hazardous materials regulations for nitro and sulfonic compounds
• Verify no halogenation present, as halogenated derivatives may shift classification within 2904
Related Products under HTS 2904.99.35.00
4,4'-Dinitrostilbene-2,2'-disulfonic acid, 85% purity
Technical grade 4,4'-Dinitrostilbene-2,2'-disulfonic acid at 85% purity with minor impurities, still recognized as the specific compound. Falls under HTS 2904.99.35.00 per chapter note (a) allowing impurities in chemically defined compounds. Used in industrial dye manufacturing processes.
Sodium 4,4'-Dinitrostilbene-2,2'-disulfonate
The sodium salt form of 4,4'-Dinitrostilbene-2,2'-disulfonic acid, where inorganic sodium pairs with the organic sulfonic acid. HTS 2904.99.35.00 applies per chapter note on inorganic salts of organic compounds classifying with the parent acid. Common form for dye intermediate applications.
4,4'-Dinitrostilbene-2,2'-disulfonic acid aqueous solution 20%
20% aqueous solution of 4,4'-Dinitrostilbene-2,2'-disulfonic acid prepared for safe transport. Qualifies under HTS 2904.99.35.00 per chapter note (d) for products dissolved in water. Used in liquid form for immediate dye processing.
4,4'-Dinitrostilbene-2,2'-disulfonic acid with stabilizer
Stabilized 4,4'-Dinitrostilbene-2,2'-disulfonic acid containing anticaking agent for preservation during storage and transport. Remains under HTS 2904.99.35.00 per chapter note (f) allowing stabilizers necessary for preservation. Industrial dye production intermediate.