Refractory Chamotte for Cement Kilns
Medium-duty chamotte refractory clay optimized for rotary cement kilns is a calcined clay aggregate offering abrasion resistance and thermal shock tolerance. It is classified as chamotte earth in bulk aggregate form, consistent with Chapter 25 note 1 as it has not been processed beyond calcination and mechanical treatment.
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 a prepared refractory mix with binders
Prepared refractory mixes are classified as chemical products.
If the chamotte is formed into refractory bricks for kiln linings
Refractory bricks are finished ceramic articles.
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
• Confirm the chamotte is not mixed with hydraulic binders or other additives, as such mixtures are excluded from Chapter 25
• Provide documentation of the calcination process and intended use as a raw material
• Verify the product is not considered a prepared refractory mix, which would fall under heading 38.16
Related Products under Tariff item 2508.70.00
Calcined Chamotte Refractory Clay
Calcined chamotte is a high-alumina fired clay aggregate produced by calcining fireclay at high temperatures. It is used primarily as a raw material in refractory brick manufacturing for furnace linings, and remains in a crude or processed state consistent with Chapter 25 note 1.
Dinas Earth Refractory Grogs
Dinas earth refractory grogs are siliceous chamotte materials derived from quartzite clays and calcined for use as grog in high-silica refractories for steelmaking ladles. They are crude or processed mineral products within the scope of Chapter 25, specifically classified as dinas earths.
Fireclay Chamotte Aggregates 70% Al2O3
Fireclay-based chamotte aggregates with 70% alumina content are calcined clays used as coarse fractions in refractory concrete for kilns and incinerators. These aggregates are chamotte earths in crude or processed form, not exceeding the processing allowed by Chapter 25 note 1.
High-Alumina Chamotte Powder
High-alumina chamotte powder, typically 50-70% Al2O3, is produced by calcining fireclay and grinding it to a powder for addition to monolithic refractories and castables. It is classified as chamotte earth in powdered form, a product of Chapter 25 that has undergone only mechanical processing.
Mullite-Forming Chamotte Grogs
Chamotte grogs engineered to form mullite crystals upon firing are calcined clays used in advanced refractories for petrochemical heaters. These grogs are chamotte earths in an unfinished raw state, within the scope of Chapter 25 as they have not been processed beyond crushing, grinding, or calcination.
Siliceous Dinas Earth for Glass Furnace Refractories
Siliceous dinas earth, calcined from quartz-rich clays, is specialized for crown refractories in glass melting furnaces due to its low thermal expansion. It is classified as dinas earths under tariff item 2508.70.00, as it is a crude mineral product that has not been processed beyond calcination and mechanical treatment.