Gamma Acid (1,8-Dihydroxynaphthalene-3,6-disulfonic acid isomer) from Mexico
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 — Mexico → United States
15.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• NMR spectra documentation differentiates isomers if CBP questions specificity
• Store below 40°C to prevent decomposition; declare stability data