Ammonium Alum Powder
Ammonium alum powder, chemically ammonium aluminum sulfate dodecahydrate, is a double sulfate salt classified as an alum under heading 28.33. It is used in flameproofing textiles and as a component in baking powder. Its composition as a hydrated double sulfate of ammonium and aluminum places it squarely within the tariff item for alums.
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 not a true double sulfate alum but a single sulfate salt
Single sulfates of ammonium or aluminum fall under other sodium sulphate items, not alums.
If the powder is mixed with other substances for a specific industrial use
Preparations containing alums mixed with other chemicals may be classified as chemical products not elsewhere specified.
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 clearly labeled with its chemical name and purity to support classification as an alum
• If imported for food use, verify it meets Health Canada food additive requirements
• Keep certificates of analysis handy for CBSA inspection
Related Products under Tariff item 2833.30.00
Chrome Alum Crystals
Chrome alum crystals, or chromium potassium sulfate dodecahydrate, are a violet double sulfate salt used in leather tanning and as an analytical reagent. As a hydrated double sulfate of chromium and potassium, it meets the definition of an alum under tariff item 2833.30.00. The product is chemically defined and falls within chapter 28's scope for separate chemical compounds.
Ferric Ammonium Alum
Ferric ammonium alum, also known as ammonium iron(III) sulfate dodecahydrate, is a pale violet double sulfate salt used as a coagulant in water treatment and as a mordant in dyeing. Its structure as a hydrated double sulfate of ferric iron and ammonium qualifies it as an alum under tariff item 2833.30.00. This chemically defined compound is covered by chapter 28's provisions for separate chemical elements and compounds.
Food-Grade Potassium Alum
Food-grade potassium alum, or potassium aluminum sulfate dodecahydrate, is a high-purity double sulfate salt used as a pickling agent and for water clarification in food processing. Its chemically defined double sulfate composition classifies it as an alum under tariff item 2833.30.00. The FCC grade ensures suitability for food applications, but the classification remains within chapter 28 as a separate chemical compound.
Lab Grade Chrome Alum
Lab-grade chrome alum is a high-purity chromium potassium sulfate dodecahydrate intended for laboratory reagents and crystal growth experiments. As a chemically defined double sulfate salt, it is classified as an alum under tariff item 2833.30.00. The product's purity does not change its classification, as chapter 28 covers separate chemical compounds regardless of grade.
Pharmaceutical Grade Ammonium Alum
Pharmaceutical-grade ammonium alum, or ammonium aluminum sulfate dodecahydrate, is a USP-grade double sulfate salt used in topical astringents and pharmaceutical formulations. Its chemically defined nature and double sulfate structure classify it as an alum under tariff item 2833.30.00. The pharmaceutical grade does not alter its classification within chapter 28, as the product remains a separate chemical compound.
Potassium Alum Crystals
Potassium alum crystals, or potassium aluminum sulfate dodecahydrate, are a classic double sulfate salt used in water purification, leather tanning, and as a styptic agent. As a hydrated double sulfate of potassium and aluminum, it is the archetypal alum and is classified under tariff item 2833.30.00. The product is chemically defined and falls within chapter 28's scope for separate chemical compounds.