Other clays
Other clays (not including expanded clays of heading 68.06), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths. > Other clays
Duty Rate (from China)
Products classified under Tariff item 2508.40.00
Activated Attapulgite Decolorizing Earth
Activated attapulgite clay, finely ground and treated to maximize its adsorption capacity, is used primarily in oil refining to strip color impurities and contaminants from petroleum products. It qualifies under tariff item 2508.40.00 as an 'other clay' that has undergone only mechanical or physical processing, not chemical alteration beyond activation.
Attapulgite Clay Granules
Granular attapulgite clay in its natural, non-expanded state, used as a suspension agent in pesticides and drilling fluids. It is a natural clay that has not been subjected to processing beyond crushing or grinding, aligning with the scope of heading 25.08.
Attapulgite Drilling Grade Clay
Fibrous attapulgite clay optimized for oil well drilling fluids, providing suspension properties. It is classified under tariff item 2508.40.00 as an 'other clay' in powdered or granular form for industrial use, not calcined or expanded.
Ball Clay for Ceramics
High-plasticity ball clay mined for use in fine porcelain and sanitaryware production. As a natural, unexpanded clay, it falls under 'other clays' in heading 25.08, not being a kaolin or fire clay.
Bentonite Clay Lumps
Natural bentonite clay in lump form, valued for its swelling properties in drilling muds, cat litter, and sealants. It is a natural clay that has not been expanded or processed beyond mechanical means, fitting the scope of 'other clays'.
Bentonite Clay Swellable Grade
Sodium montmorillonite bentonite clay with high swelling capacity, used in drilling muds and sealants. Tariff item 2508.40.00 covers this as an 'other clay', unexpanded and suitable for industrial applications like oilfield services.
Bentonite Fuller's Earth for Cosmetics
High-purity fuller's earth sourced from bentonite deposits, processed for use in facial masks and oil-absorbing cosmetics due to its natural clarifying properties. It falls under tariff item 2508.40.00 as an 'other clay' in a processed but uncalcined state, suitable for general adsorption uses.
Blue Ridge Ball Clay
Blue Ridge ball clay from Georgia deposits provides medium plasticity for tile bodies and engobes, with good suspension properties. It is a natural, uncalcined ball clay, falling under 'other clays'.
Calcined Kaolin Metakaolin
Partially calcined kaolin producing metakaolin for high-performance concrete with pozzolanic reaction. Tariff item 2508.40.00 includes calcined 'other clays' unless specifically chamotte; metakaolin qualifies as processed clay, though calcination may be a concern.
Carolina Ball Clay
Carolina ball clay from North Carolina is valued for electrical porcelain insulators due to its high fired strength and low electrical conductivity. It is uncalcined and natural, falling under 'other clays'.
Common Brick Clay
Surface-mined common clay suitable for traditional brick and tile production. It is raw and uncalcined, falling under 'other clays' as a natural clay not otherwise specified.
Common Brick Clay Raw
Unprocessed loamy clay suitable for manufacturing common bricks and tiles. Tariff item 2508.40.00 includes such 'other clays' in their natural state, not prepared for immediate refractory use, and not subjected to processing beyond washing or crushing.
Devon Ball Clay
Devon ball clay, sourced from England's Bovey Basin, offers superior casting slip performance and vitrification for bone china and electrical porcelain. It is a natural, uncalcined ball clay, falling under 'other clays'.
Diatomaceous Earth Decolorizing Grade
Calcined diatomite selected for decolorizing applications in sugar refining and beverage processing, acting as a filter aid with adsorptive properties. Although primarily siliceous, it is classified under tariff item 2508.40.00 when specifically processed as a decolorizing earth, not as a general filter aid.
Earthenware Clay Mix
Blended natural clays for low-fire earthenware pottery, not agglomerated or calcined. The blend remains under 'other clays' as it is a natural clay mixture not processed beyond mechanical means.
Earthenware Pottery Clay Body
Blended clay body for earthenware pottery production, containing kaolin, ball clay, and flint. Tariff item 2508.40.00 applies as an 'other clay' prepared but not fired, suitable for ceramic manufacturing, though blending may be considered processing beyond Chapter 25.
English China Clay Ball Clay Blend
This blend combines English ball clay with china clay for improved workability in translucent porcelain. It remains under 'other clays' if ball clay characteristics predominate and the blend is not calcined or agglomerated.
Fire Clay Powder
Refractory-grade fire clay ground into powder for brick manufacturing and high-temperature applications. It is not calcined into mullite or chamotte, so it remains under 'other clays' as a natural clay.
Florisil Magnesium Silicate Decolorizer
Synthetic magnesium silicate adsorbent similar to natural decolorizing earths, used in pharmaceutical purification and analytical chemistry for removing impurities. It is classified under tariff item 2508.40.00 when presented as a decolorizing earth, despite its synthetic origin, due to its functional equivalence.
Fuller's Earth Attapulgite
Absorbent attapulgite fuller's earth used for oil refining and cat litter bases. Tariff item 2508.40.00 classifies this as an 'other clay', representing natural mineral absorbents not calcined or expanded.
Fuller's Earth Bleaching Clay
Bentonite-based fuller's earth processed for use in edible oil refining, effectively removing color bodies, soaps, and gums through adsorption. It falls under tariff item 2508.40.00 as a natural clay with high montmorillonite content, processed only by mechanical means.
Kaolin Clay Powder
Finely ground kaolin clay, also known as china clay, used in ceramics, paper production, and as a filler in paints. It is a natural clay not specified elsewhere in the chapter, falling under 'other clays'.
Kentucky Ball Clay
Kentucky ball clay is a fine-grained, highly plastic sedimentary clay prized for its whiteness after firing and low shrinkage. It is a natural, uncalcined clay, falling under 'other clays'.
Montmorillonite Bleaching Earth
Acid-activated montmorillonite clay for vegetable oil bleaching, removing chlorophyll and carotenoids effectively. It is a core component of fuller's earth with a 2:1 layer silicate structure, classified under tariff item 2508.40.00 as an 'other clay' despite acid treatment.
OM4 Ball Clay
OM4 ball clay is a coarse, high-plasticity grade ideal for outdoor sculpture and architectural ceramics, offering robust green strength. It is a natural, uncalcined ball clay, falling under 'other clays'.
Sepiolite Clay Absorbent
Natural sepiolite clay in absorbent form for cat litter and industrial spills, not expanded. It is a fibrous clay distinct from meerschaum, falling under 'other clays'.
Sepiolite Fuller's Earth
Fibrous clay mineral sepiolite processed as fuller's earth for cat litter decolorization and industrial absorbents. Its high porosity and adsorption make it ideal for oil spill cleanup and purification, classified under tariff item 2508.40.00 as an 'other clay'.
Sepiolite Meerschaum Ore
Natural sepiolite clay mineral, known as meerschaum ore, used for pipes and absorbents. It falls under tariff item 2508.40.00 as an 'other clay', explicitly covered in heading 25.30 note but prioritized here if not polished or worked.
Tennessee No. 9 Ball Clay
Tennessee No. 9 ball clay is a premium-grade ball clay known for exceptional plasticity, casting properties, and fired color suitable for tableware and sanitaryware. It is a natural, uncalcined clay, falling under 'other clays'.
Zeolite Decolorizing Earth
Natural zeolite powder with a crystalline aluminosilicate structure used for decolorization in wastewater treatment and edible oil processing. Tariff item 2508.40.00 applies to its role as a decolorizing earth based on adsorptive properties, despite zeolite's distinct mineralogy.