4-Sulfo-1,8-Naphthalic Anhydride
4-Sulfo-1,8-naphthalic anhydride is a sulfonated aromatic polycarboxylic anhydride used in the production of fluorescent brighteners and dye intermediates. It is a separate chemically defined organic compound, and its sulfonation does not remove it from the scope of heading 29.17, as the derivatives are covered by the heading's text.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is not a separate chemically defined compound or contains additional functional groups that make it classifiable elsewhere.
Other heterocyclic compounds with nitrogen hetero-atoms only, which may apply if the structure includes a nitrogen-containing ring.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the product is a separate chemically defined compound; if it contains impurities, they must be incidental
• Verify that the sulfonic acid group is directly attached to the aromatic ring, as this confirms classification under heading 29.17
• Keep technical data sheets to support the chemical identity if requested by the CBSA
Related Products under Tariff item 2917.39.00
1,4-Naphthalenedicarboxylic Acid
1,4-Naphthalenedicarboxylic acid, an aromatic polycarboxylic acid derived from naphthalene, used in high-performance polyester resins and liquid crystal polymers. It is classified under tariff item 2917.39.00 as 'Other' aromatic polycarboxylic acids and their derivatives.
2,2-Bis(3,4-dicarboxyphenyl)hexafluoropropane Dianhydride
4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride) is a fluorinated aromatic dianhydride used in producing colorless polyimides for optical applications. It is a separate chemically defined compound, and its classification under heading 29.17 is based on its structure as an aromatic polycarboxylic anhydride.
4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride) 98% purity
4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride) at 98% purity is a high-purity aromatic polycarboxylic anhydride used in polyimide synthesis. It is a separate chemically defined compound, and the purity level ensures it meets the definition under Chapter 29.
4,5,6,7-Tetrabromophthalic Anhydride
4,5,6,7-Tetrabromophthalic Anhydride is a pure halogenated aromatic polycarboxylic acid anhydride used in reactive flame retardant synthesis for unsaturated polyester resins. It falls under tariff item 2917.39.00 as an 'Other' aromatic polycarboxylic acid derivative.
6FDA Monomer -- 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride)
6FDA, or 4,4'-(hexafluoroisopropylidene)bis(phthalic anhydride), is a fluorinated dianhydride used in synthesizing polyimides with high thermal and chemical resistance. It is a separate chemically defined aromatic polycarboxylic anhydride, and its classification under heading 29.17 is clear.
Diisononyl Terephthalate (DINTP)
Diisononyl Terephthalate (DINTP) is a branched-chain ester of terephthalic acid used as a high-performance plasticizer for flexible PVC in automotive and wire insulation. It is classified under tariff item 2917.39.00 as an aromatic polycarboxylic acid ester.