Fire-Clay Grogs
Fire-clay grogs are crushed and screened particles of fired clay used as aggregate in refractory mixes. They qualify under HTS 2508.30.00.00 as fire-clay (chamotte or dinas earths), valued for thermal stability in castables. Common in foundry and boiler applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If mullite-dominant
Pure mullite (synthetic or high-purity) shifts to 2508.70; fire-clay grogs are lower-grade.
If chemically prepared with fluxes
Prepared binders or fluxed clays become Chapter 38 chemical products.
If for industrial refractory production use
End-use as refractory bricks may classify under Chapter 69 if not raw material.
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Import Tips & Compliance
• Declare particle size distribution to distinguish grogs from powder; uniform sizing avoids bulk mineral reclassification
• Certify as chamotte (fired then crushed) vs raw clay for accurate sub-description within 2508.30
• Avoid packaging suggesting retail sets, which could trigger Chapter 68 for articles
Related Products under HTS 2508.30.00.00
Calcined Fire-Clay Powder
Calcined fire-clay is a high-alumina clay processed at high temperatures to enhance its heat resistance, used primarily in refractory brick manufacturing. It falls under HTS 2508.30.00.00 as fire-clay, a type of clay suitable for withstanding high temperatures without fusing. This product is essential for furnace linings and kilns.
Raw Fire-Clay Lumps
Raw fire-clay in lump form is unprocessed high-alumina clay mined for refractory applications like stove linings. Classified under HTS 2508.30.00.00 as fire-clay, distinct from expanded clays or other minerals. It provides the base material for firebricks and pottery kilns.
High-Alumina Fire-Clay
High-alumina fire-clay contains over 40% Al2O3, ideal for severe thermal shock in steel plant refractories. It is classified in HTS 2508.30.00.00 as fire-clay, excluding expanded forms per chapter notes. Supplied in bulk for mixer plants.
Chamotte Fire-Clay
Chamotte is pre-fired fire-clay crushed into granules, used in refractory castables for improved strength. Falls under HTS 2508.30.00.00 as dinas earths or chamotte, a semi-processed clay product. Key for glass furnace repairs.
Dinas Fire-Clay Earth
Dinas earths are siliceous fire-clays used in high-temperature silica bricks for coke ovens. Classified under HTS 2508.30.00.00 as fire-clay variants like chamotte or dinas. Known for low flux content and purity.
Plastic Fire-Clay Mass
Plastic fire-clay mass is wet-mixed fire-clay for ramming into furnace shapes before firing. It is under HTS 2508.30.00.00 as unprocessed fire-clay, suitable for on-site refractory work. Used in steel ladles and incinerators.