Refractory ceramic goods; composition of which n.e.c. in heading no. 6903, other than those of siliceous fossil meals or similar earths

HS code 690390 covers a diverse range of refractory ceramic goods that are not classified elsewhere in heading 6903. These specialized materials are essential for industries that require high-temperature resistance, such as steel production, glass manufacturing, and various chemical processes. Their unique composition and properties make them indispensable for maintaining the integrity and efficiency of critical industrial equipment and infrastructure.

The production of refractory ceramic goods under HS code 690390 typically involves the careful selection and blending of raw materials, such as clay, silica, and various mineral additives. These components are then subjected to high-temperature firing and sintering processes to achieve the desired level of hardness, thermal resistance, and chemical stability. Depending on the specific application, the final products may undergo additional shaping, machining, or surface treatments to meet the precise requirements of end-users.

The main inputs for the production of HS code 690390 refractory ceramic goods include a variety of raw materials, such as 2508 Natural clays, 2510 Natural calcium phosphates and natural aluminum calcium phosphates, 2511 (Natural barium sulfate (barytes); natural barium carbonate (witherite)), and 2519 (Natural magnesium carbonate (magnesite)). Additionally, specialized machinery and equipment for high-temperature processing, such as kilns and sintering furnaces, are essential for the manufacturing process.

The refractory ceramic goods produced under HS code 690390 find widespread application in various industries, including 7201 Pig iron and spiegeleisen in pigs, blocks or other primary forms, 7202 Ferro-alloys, 7203 Ferrous products obtained by direct reduction of iron ore and other spongy ferrous products, in lumps, pellets or similar forms; iron having a minimum purity by weight of 99.94%, in lumps, pellets or similar forms, 7204 Ferrous waste and scrap; remelting scrap ingots of iron or steel, and 7301 Sheet piling of iron or steel, whether or not drilled, punched or made from assembled elements; welded angles, shapes and sections, of iron or steel. These refractory materials are essential for maintaining the integrity and efficiency of industrial equipment and processes that operate at high temperatures.