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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing additional nitrogen functions beyond phenolic OH
Nitrogen heterocyclic derivatives classify under 2922 oxygen+nitrogen functions.
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Import Tips & Compliance
• NMR spectra documentation differentiates isomers if CBP questions specificity
• Store below 40°C to prevent decomposition; declare stability data
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.
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.