Cordierite Kiln Support Shelf
A cordierite ceramic shelf supporting pottery ware during high-temperature kiln firing. This refractory ceramic good is fired after shaping and falls under tariff item 6903.90.00 as an 'other' refractory article. Its low thermal expansion and high-temperature resistance make it ideal for kiln furniture in the ceramic industry.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the shelf is used for laboratory or technical ceramic applications
Ceramic supports for technical use may be classified under heading 6909.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Confirm the shelf is fired above 800°C to qualify under Chapter 69; include firing certificates in your import documents
• Classify under 6903.90.00 as a refractory support and ensure it is not used as kiln furniture for pottery, which may fall under other headings
• Verify the material composition for accurate classification
Related Products under Tariff item 6903.90.00
Alumina Ceramic Retort
A high-alumina ceramic retort designed for laboratory pyrolysis and gas synthesis reactions at temperatures exceeding 1600°C. This product is a refractory ceramic good, fired after shaping, and falls under tariff item 6903.90.00 as an 'other' refractory article. Its pure oxide composition and high-temperature resistance make it essential for chemical processing applications.
Alumina Crucible
A high-purity alumina ceramic crucible used for melting and holding metals or chemicals at high temperatures in laboratories and foundries. This product is a refractory ceramic good, fired after shaping, and falls under tariff item 6903.90.00 as an 'other' refractory article. Its ability to withstand extreme temperatures and chemical corrosion makes it suitable for demanding metallurgical processes.
Ceramic Ladle Plunger
A zirconia-graphite ceramic plunger for stirring molten steel in secondary refining ladles. This refractory ceramic good is fired after shaping and falls under tariff item 6903.90.00 as an 'other' refractory article. Its high-fired construction provides extreme corrosion resistance, essential for steelmaking immersion devices.
Ceramic Pug Mill Nozzle
A silicon carbide nozzle for high-pressure ceramic pug mills extruding clay products. This refractory ceramic good is fired after shaping and falls under tariff item 6903.90.00 as an 'other' refractory article. Its resistance to abrasive clay slips and high temperatures makes it suitable for industrial ceramic processing equipment.
Cupel for Fire Assay
A magnesia ceramic cupel absorbing lead in precious metal fire assay analysis. This refractory ceramic good is fired after shaping and falls under tariff item 6903.90.00 as an 'other' refractory article. Its bone ash-magnesia fired composition is specifically designed for metallurgical testing applications.
Graphite Crucible with Clay Bond
A clay-bonded graphite crucible for non-ferrous metal melting in jewelry and investment casting. This refractory ceramic good is fired after shaping and falls under tariff item 6903.90.00 as an 'other' refractory article. Its graphite-carbon composite construction meets Chapter 69 firing requirements and provides excellent thermal resistance.