Synthetic Amorphous Silica Gel
Synthetic amorphous silica gel is a porous, granular form of silicon dioxide produced by acidifying sodium silicate. It is a chemically defined inorganic compound of silicon dioxide, which falls under tariff item 2811.22.00 as 'other inorganic oxygen compounds of non-metals.' Its primary use as a desiccant does not alter its classification as a basic chemical.
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 silica gel is blended with other substances or put up for retail sale as a prepared desiccant
Prepared desiccants or mixtures containing silica gel with additives may fall under chemical products and preparations of Chapter 38.
If the product is not silicon dioxide but another inorganic oxygen compound of a non-metal
This subheading covers other inorganic oxygen compounds of non-metals not elsewhere specified.
If the product is natural silica sands, not synthetic
Natural sands of silica are classified in Chapter 25, not as chemically defined silicon dioxide.
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 silica gel is not mixed with cobalt chloride or other indicators that could change its classification
• Declare the product as silicon dioxide (CAS 7631-86-9) to avoid delays
• Keep technical datasheets showing it is synthetic and amorphous, not crystalline, as crystalline forms may face different scrutiny
Related Products under Tariff item 2811.22.00
Coarse-Pore Synthetic Silica Gel for Water Filtration
Coarse-pore synthetic silica gel used in preliminary water filtration stages. It is a separate chemically defined compound of silicon dioxide, meeting Chapter 28 Note 1 criteria.
Colloidal Silica Dispersion (50% Solids)
Colloidal silica dispersion with 50% solids, used in semiconductor polishing. It is silicon dioxide suspended in water, meeting Chapter 28 Note 1(b) for aqueous solutions.
Food-Grade Synthetic Silica Gel Capsules
Encapsulated synthetic silica gel for moisture control in food packaging. The silica gel core is a separate chemically defined compound, and the encapsulation does not alter its classification.
Fumed Silica (Aerosil)
Fumed silica produced by flame hydrolysis, a form of synthetic silicon dioxide. It is a separate chemically defined compound, meeting Chapter 28 criteria.
High-Purity Silica Powder for LEDs
High-purity silica powder for LED phosphor production, with purity above 99.99%. It is a separate chemically defined compound of silicon dioxide.
High-Purity Synthetic Silica Gel for Chromatography
High-purity synthetic silica gel for chromatography, with controlled pore size. It is a separate chemically defined compound of silicon dioxide, suitable for laboratory use.