Fire-clay
Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths: > Fire-clay
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Products classified 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.
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.
Micaceous Fire-Clay
Micaceous fire-clay blends clay with natural mica flakes for enhanced thermal insulation in refractories. Classified in HTS 2508.30.00.00 as fire-clay, not split block mica. Applied in lightweight kiln furniture.
Fire-Clay for Ceramic Kilns
Fire-clay graded for ceramic kiln furniture withstands repeated firing cycles up to 1400°C. Under HTS 2508.30.00.00 as fire-clay, excluding worked forms. Bulk supplied to pottery manufacturers.
Refractory Fire-Clay Granules
Refractory fire-clay granules (2-6mm) serve as skeletal material in castable refractories for ladles. HTS 2508.30.00.00 covers this fire-clay form, pre-calcined for consistency. Vital for metallurgy.