Disodium 1,8-Dihydroxynaphthalene-3,6-disulfonate (H Salt)
The disodium salt form of 1,8-Dihydroxynaphthalene-3,6-disulfonic acid, commonly called H Salt, used in water-soluble dye coupling. HTS 2908.99.0900 explicitly includes this salt as a halogenated/sulfonated phenol derivative containing only sulfo groups.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when formulated as finished pigment dispersion for retail
Chapter 32 covers synthetic organic coloring matter put up in forms for retail sale, not bulk intermediates.
If misidentified as inorganic hydrogen peroxide/sodium perborate prep
Organic sulfonates with defined carbon structure remain in Chapter 29 per legal notes.
If for other nucleic acid derivatives with similar sulfo groups
Different heterocyclic structures classify under Chapter 29 subchapter heterocycles.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include salt content verification in COA; sodium content must match theoretical 14.8% for disodium form
• Label as UN 3265 Corrosive Liquid, basic, inorganic, n.o.s. for ocean transport
Related Products under HTS 2908.99.09.00
1,8-Dihydroxynaphthalene-3,6-disulfonic acid (H Acid)
Pure 1,8-Dihydroxynaphthalene-3,6-disulfonic acid, known as H Acid, is a key intermediate for azo dye synthesis. This sulfonated phenol derivative falls under HTS 2908.99.0900 due to its specific chemical structure with only sulfo groups and its disodium salt form being explicitly named in the tariff.
H Acid 98% Technical Grade Powder
Technical grade 1,8-Dihydroxynaphthalene-3,6-disulfonic acid at 98% purity with minimal impurities, packaged for industrial dye production. Classified under HTS 2908.99.0900 as the specific sulfonated derivative meeting chapter purity requirements.
Gamma Acid (1,8-Dihydroxynaphthalene-3,6-disulfonic acid isomer)
Gamma Acid, a positional isomer of H Acid also classified as 1,8-Dihydroxynaphthalene-3,6-disulfonic acid per tariff specificity. Used interchangeably in reactive dye manufacturing under the same HTS 2908.99.0900 provision.