Aluminum Sulfate Octadecahydrate
Aluminum sulfate octadecahydrate (Al2(SO4)3·18H2O) is a chemically defined hydrate of aluminum sulfate, used as a coagulant in water purification. Hydrates of inorganic compounds are covered by Chapter 28 Note 1(a) and (b), and the aluminum sulfate core places it under tariff item 2833.22.00.
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 the product is a double or complex salt, not a simple aluminum sulfate
Chapter 28 Note 5 directs double or complex salts to heading 28.42.
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
• Declare the exact hydrate form and water content, as this affects the weight-based duty calculation
• Keep documentation showing the product is a single chemically defined compound
• Check if the hydrate is stable for transport; if it requires a stabilizer, ensure it does not alter classification
Related Products under Tariff item 2833.22.00
Alum Cake (Aluminum Sulfate Byproduct)
Alum cake is a solid byproduct of aluminum sulfate from water treatment processes, containing the chemically defined compound Al2(SO4)3. It is classified under tariff item 2833.22.00 as an aluminum sulfate, regardless of its byproduct origin, provided it meets the purity and form criteria of Chapter 28.
Aluminum Ammonium Sulfate (Ammonium Alum)
Aluminum ammonium sulfate (NH4Al(SO4)2·12H2O), or ammonium alum, is a double salt of aluminum and ammonium. Under Chapter 28 Note 5, double salts are classified in heading 28.42, not as an aluminum sulfate, so this product does not belong under tariff item 2833.22.00.
Anhydrous Aluminum Sulfate
Anhydrous aluminum sulfate (Al2(SO4)3) is the dehydrated form of the aluminum salt, used in paper sizing and flame retardants. As a chemically defined sulfate of aluminum, it falls squarely under tariff item 2833.22.00, with no exclusions in Chapter 28.
Flame Retardant Aluminum Sulfate Powder
Flame retardant aluminum sulfate powder is a fine powder of aluminum sulfate used in flame retardant formulations. As long as it is a chemically defined aluminum sulfate without additional flame retardant agents, it is classified under tariff item 2833.22.00. If it contains other active ingredients, it may be a preparation.
Granular Aluminum Sulfate for Paper Sizing
Granular aluminum sulfate for paper sizing is a pure aluminum sulfate in granular form, used in rosin sizing. The physical form (granular) does not affect classification, and as a chemically defined sulfate of aluminum, it falls under tariff item 2833.22.00.
Liquid Aluminum Sulfate Solution 48%
Liquid aluminum sulfate solution at 48% concentration is an aqueous solution of aluminum sulfate. Chapter 28 Note 1(b) covers products dissolved in water, so this solution is classifiable under tariff item 2833.22.00, provided the solution is a normal method of putting up for transport or safety.