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 HTS 2508.10.00.00 specifications in the clays hierarchy.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If mixed with coal or lignite dust
Coal-based foundry additives exclude to Chapter 27.
If parts of refractory goods
Clay components for refractories shift to Chapter 69.
If chemically activated fuller's earth
Acid-treated bentonite becomes a chemical preparation in 3824.
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Import Tips & Compliance
• Supply methylene blue clay test results to verify active clay content above 80%
• Avoid coal dust blends at import; those classify under 2701 or 2530 mixtures
• Use ISPM-15 compliant pallets for foundry bulk shipments to prevent fumigation delays
Related Products under HTS 2508.10.00.00
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 HTS 2508.10.00.00 as unprocessed bentonite clay, distinct from expanded clays or other minerals excluded by chapter notes.
Calcium Bentonite Powder
Fine-ground calcium bentonite clay suitable for animal feed binders and soil amendments, retaining its natural colloidal properties. Classified under HTS 2508.10.00.00 as bentonite, whether or not calcined but excluding medicaments or processed forms noted in exclusions.
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. HTS 2508.10.00.00 covers this unexpanded, raw bentonite clay explicitly in the clays subheading.
Calcined Bentonite Clay
Bentonite subjected to controlled calcining to enhance adsorption properties for foundry sand bonding, still classifiable as clay under the heading allowing calcined forms. Excluded items like dolomite mixes (3816) do not apply to this pure mineral product.
Bentonite for Cat Litter Base
Granular sodium bentonite clay serving as the absorbent core material for clumping cat litters, imported in bulk for further processing. HTS 2508.10.00.00 applies to this unprepared clay, not final consumer preparations excluded to other chapters.
Agricultural Bentonite Sealant
Coarse sodium bentonite pellets for pond liners and irrigation canal sealing in farming applications. Remains under HTS 2508.10.00.00 as unprocessed bentonite clay, not fabricated into setts or excluded products.