o-Nitroaniline-p-sulfonic acid, sodium salt

The sodium salt of o-nitroaniline-p-sulfonic acid (4-amino-2-nitrobenzenesulfonic acid sodium salt) is specifically named in HTS 2921.42.36.00. Essential for direct dye synthesis.

Import Duty Rates by Country of Origin

Origin CountryMFN RateCh.99 SurchargesTotal Effective Rate
🇨🇳ChinaFree+35.0%35%
🇲🇽MexicoFree+10.0%10%
🇨🇦CanadaFree+10.0%10%
🇩🇪GermanyFree+10.0%10%
🇯🇵JapanFree+10.0%10%

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

2921.42Same rate: 35%

If free acid form or different salt

Only sodium salt of this specific compound explicitly listed.

2930Lower: 13.7% vs 35%

If classified as sulfonated nitro compound

Amine-function takes precedence over sulfonated classification per chapter notes.

2921.45Lower: 16.5% vs 35%

If derived from naphthylamine

Naphthylamine sulfonic acids classify separately under 2921.45.

Not sure which classification is right?

Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.

Import Tips & Compliance

Molecular formula confirmation C6H5N2O5SNa required for exact HTS match

Light-sensitive; packaging must prevent degradation affecting purity specs

Common misclassification as 3204 dye product; remains chemical intermediate