4-Amino-2-stilbenesulfonic acid
4-Amino-2-stilbenesulfonic acid is a specific aromatic amine derivative with a sulfonic acid group, explicitly listed under HTS 2921.49.10.00. It is primarily used as an intermediate in the production of optical brightening agents for textiles, paper, and detergents. This chemically defined compound falls within Chapter 29 for separate organic compounds with amine-function groups.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not explicitly named in the HTS listing
Other aromatic monoamines fall under the broader 'Other' subheading, but this specific compound is carved out separately.
If pre-reacted into synthetic dye or brightener formulation
Once converted into finished synthetic organic coloring matter, it shifts to Chapter 32 headings.
If imported as mixture with solvents/stabilizers exceeding Chapter 29 tolerances
Chemical preparations not purely chemically defined organic compounds move to Chapter 38.
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Import Tips & Compliance
• Verify purity certificate (≥98%) and provide chemical analysis to confirm identity as listed in HTS 2921.49.10.00
• Include Safety Data Sheet (SDS) and ensure packaging complies with DOT/UN regulations for hazardous chemicals
• Avoid misclassification as dye intermediates under Chapter 32; request binding ruling for custom formulations
Related Products under HTS 2921.49.10.00
2,4,6-Trimethylaniline (Mesidine)
Mesidine, or 2,4,6-trimethylaniline, is a sterically hindered aromatic amine listed under HTS 2921.49.10.00, used in synthesis of pharmaceuticals, pesticides, and polymer additives. As a chemically defined aromatic monoamine derivative, it properly falls in Chapter 29.
2,4-Xylidine
2,4-Xylidine (2,4-dimethylaniline), explicitly named in HTS 2921.49.10.00, is widely used in herbicide synthesis (e.g., diuron), dyes, and rubber antioxidants. As a pure aromatic monoamine derivative, it belongs in Chapter 29 heading 2921.
3,4-Xylidine
3,4-Xylidine (3,4-dimethylaniline), the final specifically named compound in HTS 2921.49.10.00, serves as intermediate for antioxidants, dyes, and agrochemicals. This ortho/para substituted aromatic monoamine is properly classified in Chapter 29.
p-Ethylaniline
p-Ethylaniline (4-ethylaniline) is an aromatic monoamine explicitly named in HTS 2921.49.10.00, used as a chemical intermediate in agrochemicals, pharmaceuticals, and dye manufacturing. Its amine-function structure on a benzene ring with ethyl substituent qualifies it as a derivative under Chapter 29 heading 2921.
2,3-Xylidine
2,3-Xylidine (2,3-dimethylaniline) is one of the specific xylidine isomers listed in HTS 2921.49.10.00, serving as an intermediate for azo dyes, pharmaceuticals, and UV stabilizers. This aromatic amine with two methyl groups on adjacent ring positions fits Chapter 29 amine-function compounds.
2,5-Xylidine
2,5-Xylidine (2,5-dimethylaniline) listed under HTS 2921.49.10.00 is an intermediate for direct dyes, pharmaceuticals, and photographic chemicals. Its aromatic amine structure with meta/para methyl substitution qualifies under Chapter 29.