1,8-Dihydroxynaphthalene-3,6-disulfonic acid (H Acid)
1,8-Dihydroxynaphthalene-3,6-disulfonic acid, known as H Acid, is a key intermediate for azo dye synthesis. It is a separate chemically defined organic compound with two hydroxy groups and two sulfo groups. It falls under tariff item 2908.99.00 as a sulphonated derivative of phenols or phenol-alcohols.
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 |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as a synthetic organic colouring matter
H Acid is a dye intermediate; if it is further processed into a dye, it may be classified under synthetic organic colouring matter.
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
• Provide the CAS number and purity analysis on the import documents
• Confirm that the product is not put up in a form for retail sale
• Check the CBSA's tariff classification advice for similar compounds to ensure consistency
Related Products under Tariff item 2908.99.00
1-Naphthol-3,6-disulfonic acid
1-Naphthol-3,6-disulfonic acid, also known as H-acid, is a sulfonated derivative of naphthol with two sulfo groups. It is a separate chemically defined organic compound used as an intermediate in dye chemistry. It falls under tariff item 2908.99.00 as a sulphonated derivative of phenols or phenol-alcohols.
1-Naphthol-4-sulfonic acid
1-Naphthol-4-sulfonic acid is a sulfonated derivative of 1-naphthol with a sulfo group at the 4-position. It is a separate chemically defined organic compound used as a dye intermediate. It falls under tariff item 2908.99.00 as a sulphonated derivative of phenols or phenol-alcohols.
1-Naphthol-4-sulfonic acid monohydrate
1-Naphthol-4-sulfonic acid monohydrate is the hydrated form of 1-naphthol-4-sulfonic acid, stable for transport in dye production. It is a separate chemically defined organic compound with water of hydration. It qualifies under tariff item 2908.99.00 as a sulphonated derivative of phenols or phenol-alcohols, as the water does not alter its chemical classification.
2,5-Dihydroxybenzenesulfonic acid potassium salt
2,5-Dihydroxybenzenesulfonic acid potassium salt is a sulfonated derivative of dihydroxybenzene in its potassium salt form. It is a separate chemically defined organic compound with only sulfo groups attached to the phenolic structure. It qualifies under tariff item 2908.99.00 as a sulphonated derivative of phenols or phenol-alcohols.
2-Naphthol-3,6-disulfonic acid disodium salt
2-Naphthol-3,6-disulfonic acid disodium salt, also known as R-acid salt, is a sulfonated naphthol derivative with two sulfo groups in its disodium salt form. It is a separate chemically defined organic compound used in dye synthesis. It falls under tariff item 2908.99.00 as a sulphonated derivative of phenols or phenol-alcohols.
3,6-Dihydroxy-2,7-naphthalenedisulfonic acid
3,6-Dihydroxy-2,7-naphthalenedisulfonic acid is a naphthalene-based compound with two hydroxy groups and two sulfo groups. It is a separate chemically defined organic compound and a sulfonated derivative of phenol-alcohols. It qualifies under tariff item 2908.99.00 as a sulphonated derivative of phenols or phenol-alcohols.