Chamotte Fire-Clay
Chamotte fire-clay is pre-fired fire-clay crushed into granules, used in refractory castables for improved strength. It is classified under tariff item 2508.30.00 as fire-clay, as chamotte is a form of fire-clay that has been fired and crushed, processes permitted by Chapter 25 Note 1. The product is essential for glass furnace repairs and other high-temperature applications.
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 product is specifically identified as chamotte or dinas earths in the tariff.
The subheading 2508.70.00 covers chamotte and dinas earths, which are distinct from fire-clay.
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 that the chamotte is not mixed with other materials, as Chapter 25 Note 1 excludes mixed products
• Provide documentation showing the firing and crushing processes to justify classification under 2508.30.00
• Check if the granules meet any specific size requirements that might affect classification
Related Products under Tariff item 2508.30.00
Calcined Fire-Clay Powder
Calcined fire-clay powder is a high-alumina clay processed at elevated temperatures to enhance its heat resistance, making it suitable for refractory brick manufacturing. It falls under tariff item 2508.30.00 as fire-clay, a clay product not subjected to processing beyond calcination, which is permitted under Chapter 25 Note 1. The product is in a powdered form, consistent with the mechanical processes allowed for classification in this chapter.
Dinas Fire-Clay Earth
Dinas fire-clay earth is a siliceous fire-clay used in high-temperature silica bricks for coke ovens. It is classified under tariff item 2508.30.00 as fire-clay, given its siliceous nature and low flux content. The product is not subjected to processing beyond crushing or grinding, aligning with Chapter 25 Note 1.
Fire-Clay for Ceramic Kilns
Fire-clay graded for ceramic kiln furniture is designed to withstand repeated firing cycles up to 1400°C. It is classified under tariff item 2508.30.00 as fire-clay, as it is not worked into specific shapes and is supplied in bulk. The product undergoes only mechanical processes like crushing or grinding, consistent with Chapter 25 Note 1.
Fire-Clay Grogs
Fire-clay grogs are crushed and screened particles of fired clay used as aggregate in refractory mixes. They are classified under tariff item 2508.30.00 as fire-clay, as grogs are a form of chamotte or dinas earths. The product is valued for thermal stability in castables and is processed only by crushing and screening.
High-Alumina Fire-Clay
High-alumina fire-clay contains over 40% Al2O3, ideal for severe thermal shock in steel plant refractories. It is classified under tariff item 2508.30.00 as fire-clay, as the product is not expanded or subjected to processing beyond mechanical means. The clay is supplied in bulk and used in refractory applications.
Micaceous Fire-Clay
Micaceous fire-clay is a blend of fire-clay with natural mica flakes, enhancing thermal insulation properties for use in lightweight kiln furniture and refractory applications. It is classified under this tariff item as fire-clay because the mica content does not alter the clay's fundamental character as a refractory material, and it has not been subjected to processing beyond washing, crushing, or grinding.