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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If further shaped into slabs
Machined or finished chamotte articles enter Chapter 68.
If pre-mixed ramming mixes
Dolomite or clay ramming mixes specifically excluded to 3816 per notes.
If sillimanite content predominant
Sillimanite separates from generic fire-clay in hierarchy.
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Import Tips & Compliance
• Document firing temperature (typically 1200-1400°C) to prove chamotte status vs raw clay
• Use ISPM-15 compliant pallets for bulk bags to prevent fumigation delays
• Monitor for iron impurities; high Fe2O3 may invoke earth color exclusions to 2530
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.
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.
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.
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.