7-(Methylamino)-1-naphthol-3-sulfonic Acid from United States
7-(Methylamino)-1-naphthol-3-sulfonic Acid is a naphthol isomer with a methylamino group and a sulfonic acid group. It is essential for azoic dye coupling components. The amino-naphthol structure classifies it under this tariff item.
Duty Rate — United States → Canada
0%
Import Tips
• Confirm the product is a separate chemically defined compound
• Provide the CAS number and purity certificate
• Be aware that sulfonic acid derivatives are classified here as amino-naphthols, not as organo-sulphur compounds