Mullite Refractory Brick
Synthetic mullite bricks (3Al2O3·2SiO2) with over 60% alumina equivalent, used in blast furnace stove linings. Fired at high temperatures for superior creep resistance. HTS 6902.20.50.20 applies to these alumina-silica dominant refractory blocks.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If finished as bone chinaware articles
Consumer ceramic tableware with bone ash content shifts to 6909/6911 per US notes.
If unfired calcined aluminosilicate powders
Raw ceramic materials before shaping/firing classify in Chapter 25.
If roofing tiles exceeding tile thickness limits
Thick (>3.2cm) construction tiles may fall under 6905 per US note.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Provide XRF analysis confirming alumina-silica percentages for customs verification
• Declare exact firing process to meet Chapter 69 (c) inorganic nonmetallic criteria
Related Products under HTS 6902.20.50.20
Silica-Alumina Skid Rail Tile
Refractory tiles composed of 55% silica and 40% alumina for skid rails in reheating furnaces, providing wear resistance. Shaped and fired for high-temperature industrial applications. Classified in 6902.20.50.20 as 'other' alumina-silica refractory tiles for construction.
High-Silica Alumina Kiln Shelf
Kiln furniture shelves with 65% silica and 30% alumina for supporting pottery during firing. Refractory ceramic slabs shaped and fired per Chapter 69 standards. HTS 6902.20.50.20 for other alumina-silica constructional goods.
High-Alumina Refractory Firebrick
A dense refractory brick containing over 70% alumina (Al2O3) and silica (SiO2), fired after shaping to withstand temperatures exceeding 1700°C. Used primarily in furnace linings and kilns for its high thermal resistance and mechanical strength. Classifies under HTS 6902.20.50.20 as a refractory ceramic constructional good with more than 50% alumina-silica content, not of siliceous fossil meals.
Alumina-Silica Refractory Anchor Brick
Specialty anchor bricks with 60% alumina and 35% silica, designed with notches for securing fiber modules in high-temperature furnaces. Fired ceramic goods essential for industrial kiln construction. Fits HTS 6902.20.50.20 due to predominant alumina-silica content and refractory block form.
70% Alumina Refractory Checker Brick
Perforated checker bricks with 70% Al2O3 for regenerator chambers in glass furnaces, promoting heat recovery. High-fired ceramic blocks meeting Chapter 69 firing requirements. Under HTS 6902.20.50.20 for high alumina-silica refractory construction goods.
Andalusite Refractory Block
Refractory blocks containing andalusite (Al2SiO5) yielding >50% alumina-silica, for steel ladle impact zones. High-fired for thermal shock resistance in construction applications. Classed under 6902.20.50.20 as other alumina-silica refractory goods.