Chicago Acid (4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid) from Mexico
Chicago Acid is a specific aminohydroxynaphthalenedisulfonic acid used primarily as an intermediate in the synthesis of reactive dyes and azo pigments. It falls under HTS 2922.21.1000 as one of the enumerated oxygen-function amino-naphthol sulfonic acids containing both amino and hydroxy groups with sulfonic acid functions. This chemically defined organic compound is supplied as a powder or solution for industrial dye production.
Duty Rate — Mexico → United States
Rate breakdown
Import Tips
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm identity as the specific enumerated compound under this subheading
• Ensure proper hazardous material declaration (UN 3265, Corrosive liquid, acidic, organic, n.o.s.) for transport compliance
• Include end-use statement confirming dye intermediate application to avoid misclassification into Chapter 32 coloring matters