Disodium 1,8-Dihydroxynaphthalene-3,6-disulfonate (H Salt) from Mexico
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.
Duty Rate — Mexico → United States
15.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• 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