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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If derivatized with additional halogen beyond sulfonation
Halogenated sulfonated phenols with multiple halogens classify earlier in 2904 per numerical order rule.
If when imported with >2% dye impurities or multiple isomers
Mixtures not meeting 'separate chemically defined' criteria fall to Chapter 38.
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Import Tips & Compliance
• Batch certificates must specify assay >95% to qualify as 'chemically defined' per Chapter 29 note (a)
• Dust hazard precautions required; import under proper NA1993 or UN3077 if stabilizer-added
• Avoid bulk packaging over 25kg drums without anti-caking agent certification
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.
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.
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.