Clay Refractory Tube
High-temperature clay tubes for kiln furniture and thermocouple sheaths. Fired refractory clay construction places it under HTS 6903.90.00.10 as listed 'tubes' other than siliceous types.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If alumina-silicate composition
Higher alumina blends classify under separate 6903 provisions.
If finished as lab porcelain crucibles
Porcelain-grade fired clay labware moves to Chapter 69 tableware/lab headings.
If regular shaped refractory pieces
Precisely shaped items may qualify as 6902 refractory goods.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include kiln firing temperature certification (>800°C) to meet Chapter 69 firing requirement
• Specify inner/outer dimensions and thermal rating on invoices
• Watch for exclusion if used as electrical insulators (8546/8547)
Related Products under HTS 6903.90.00.10
Clay Refractory Nozzle
Refractory clay nozzle for steel continuous casting, enduring extreme molten metal temperatures. Fired from special refractory clays, it fits HTS 6903.90.00.10 as an 'other' refractory ceramic good explicitly listed as nozzles.
Clay Refractory Kiln Shelf
Heavy-duty clay shelves for supporting pottery in industrial kilns. As 'supports' explicitly mentioned in heading 6903, pure clay versions fall under statistical reporting number 6903.90.00.10.
Clay Retort for Laboratory
Traditional clay retorts used in chemical distillation processes at high temperatures. Fired clay construction qualifies as refractory goods under 6903.90.00.10 per heading examples.
Clay Refractory Rod
Fired clay rods used as stirring tools and supports in high-temperature furnaces. As named 'rods' in heading 6903 other refractory goods, clay composition dictates 6903.90.00.10.
Clay Cupel for Assay
Small clay cupels used in precious metal fire assaying to collect beads. Traditional fired clay construction fits 6903.90.00.10 as explicitly named refractory goods.
Clay Refractory Pipe
Heavy clay refractory pipes for high-temperature gas transport in furnaces. Listed as 'pipes' in 6903, clay material specifies 6903.90.00.10 reporting.