Martialite Synthetic Aluminum Hydroxide
Martialite synthetic aluminum hydroxide is a manufactured form of aluminum hydroxide with a defined crystal structure, typically bayerite or another polymorph, produced for use in ceramics and catalyst manufacturing. Its synthetic origin and high surface area exceeding 200 m²/g distinguish it from natural mineral forms, supporting classification under tariff item 2818.30.00. The product is not a natural mineral and falls within the scope of chemically defined aluminum hydroxide.
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 partially dehydrated and contains less than 50% hydroxide
It would then be classified as aluminum oxide.
If the product is blended with other chemicals for a specific industrial use
Mixtures not meeting the definition of a separate chemically defined compound may fall under chemical products and preparations.
If the product is a double or complex salt of aluminum
Double or complex salts are classified under heading 28.42 per chapter note 5.
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
• Document the synthetic production process and crystal structure to demonstrate it is not a natural mineral, which CBSA may request
• Verify that the surface area and purity meet the tariff item's requirements; include technical data sheets with the customs declaration
• If the product is mixed with other substances, check whether it qualifies as a separate chemically defined compound
Related Products under Tariff item 2818.30.00
Aluminum Hydroxide Flame Retardant Filler
Micronized aluminum hydroxide used as a halogen-free flame retardant and smoke suppressant in plastics and rubber. It is a chemically defined compound (Al(OH)3) of high purity, meeting the terms of Chapter 28 Note 1(a) and classified under tariff item 2818.30.00.
Aluminum Hydroxide Gel USP (Antacid Suspensions)
USP-grade aluminum hydroxide gel for liquid antacid formulations and phosphate binders. Despite being in gel form, it is a chemically defined compound of aluminum hydroxide, meeting Chapter 28 Note 1(b) as a product dissolved or suspended in water, and is classifiable under tariff item 2818.30.00.
Aluminum Hydroxide Paper Filler Precipitate
Precipitated aluminum hydroxide used as a retention aid and filler in alkaline paper manufacturing. With chemical purity exceeding 99.5% Al(OH)3, it qualifies as a separate chemically defined compound under Chapter 28 Note 1(a) and is classified under tariff item 2818.30.00.
Aluminum Hydroxide Powder (Pharmaceutical Grade)
Fine aluminum hydroxide powder used as an antacid in pharmaceutical formulations. It is a chemically defined compound of high purity, distinct from mixed or impure preparations, and therefore falls under tariff item 2818.30.00 as aluminum hydroxide.
Athermal Aluminum Trihydroxide (Cable Compounds)
High-purity aluminum trihydroxide (ATH) processed for low-smoke zero-halogen (LSZH) cable insulation compounds. It is a chemically defined compound with optimized particle morphology, meeting Chapter 28 Note 1(a) and classified under tariff item 2818.30.00.
Flash-Calcined Aluminum Hydroxide (Adsorbent)
Flash-calcined aluminum hydroxide is produced by rapidly heating aluminum hydroxide to drive off partial water content, creating a high-porosity material that serves as a precursor to activated alumina. It retains more than 50% hydroxide content, which qualifies it for classification under tariff item 2818.30.00 as aluminum hydroxide rather than as aluminum oxide. This product is commonly used in gas and liquid adsorption applications, including dehydration processes.