Calcined Bentonite Clay
Bentonite clay subjected to controlled calcining to enhance adsorption properties for foundry sand bonding. The heading explicitly allows calcined clay products, and this remains classifiable under tariff item 2508.10.00 as bentonite.
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 calcined bentonite is mixed with dolomite or other refractory materials for foundry use.
Dolomite ramming mixes are specifically excluded from Chapter 25 by Note 2(e).
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
• Verify that the calcining process does not alter the clay's fundamental structure beyond what is permitted in Chapter 25 notes
• Ensure the product is not mixed with other materials like dolomite, which would shift classification to heading 38.16
• Document the processing steps to demonstrate compliance with the heading's scope
Related Products under Tariff item 2508.10.00
Agricultural Bentonite Sealant
Coarse sodium bentonite pellets used as a sealant for pond liners and irrigation canals in agricultural applications. This product is unprocessed bentonite clay, not fabricated into setts or excluded products, and therefore falls under tariff item 2508.10.00.
Bentonite for Cat Litter Base
Granular sodium bentonite clay used as the absorbent core material for clumping cat litters, imported in bulk for further processing. This unprepared clay is classifiable under tariff item 2508.10.00 as bentonite, not as a final consumer preparation.
Calcium Bentonite Powder
Fine-ground calcium bentonite clay suitable for animal feed binders and soil amendments, retaining its natural colloidal properties. This product is classifiable under tariff item 2508.10.00 as bentonite, whether or not calcined, but excluding processed products.
Foundry Grade Bentonite
Selected bentonite with optimal montmorillonite content for green sand molding in metal casting foundries. As a raw, unexpanded clay, it precisely matches tariff item 2508.10.00 specifications in the clays hierarchy.
High-Swelling Bentonite for Drilling
Premium Wyoming sodium bentonite with high swelling capacity, supplied in bulk for preparing water-based drilling fluids in oilfield operations. Tariff item 2508.10.00 covers this unexpanded, raw bentonite clay explicitly.
Natural Sodium Bentonite Clay
A naturally occurring sodium-based bentonite clay mined from volcanic ash deposits, used primarily as a drilling mud additive in oil and gas exploration. It falls under tariff item 2508.10.00 as unprocessed bentonite clay.