Gamma Acid (1,8-Dihydroxynaphthalene-3,6-disulfonic acid isomer) from Canada
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.
Duty Rate — Canada → United States
15.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• NMR spectra documentation differentiates isomers if CBP questions specificity
• Store below 40°C to prevent decomposition; declare stability data