Fire-clay
Other clays (not including expanded clays of heading 68.06), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths. > Fire-clay > Fire-clay
Duty Rate (from China)
Subheadings
Products classified 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.
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.
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.
Plastic Fire-Clay Mass
Plastic fire-clay mass is wet-mixed fire-clay for ramming into furnace shapes before firing. It is classified under tariff item 2508.30.00 as fire-clay, as the product is not mixed with other substances beyond water, which is not considered a prohibited mixing. The product is suitable for on-site refractory work in steel ladles and incinerators.
Raw Fire-Clay Lumps
Raw fire-clay in lump form is unprocessed high-alumina clay mined for refractory applications like stove linings. It is classified under tariff item 2508.30.00 as fire-clay, as it is in a crude state and not subjected to any processing beyond mining. The product is distinct from expanded clays or other minerals.
Refractory Fire-Clay Granules
Refractory fire-clay granules (2-6mm) serve as skeletal material in castable refractories for ladles. They are classified under tariff item 2508.30.00 as fire-clay, as the granules are pre-calcined and crushed, processes permitted by Chapter 25 Note 1. The product is vital for metallurgy and is supplied in a granular form.