Precision Alumina Ceramic Tube for Thermowells
High-precision alumina ceramic tubes with 96% alumina content, used for protecting temperature sensors in harsh industrial environments. These refractory tubes are fired for continuous high-temperature service and qualify under tariff item 6903.20.00 as articles containing more than 50% alumina.
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 |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If used as electrical insulators
Electrical insulators of ceramics are excluded from Chapter 69.
If alumina content is 50% or less
Other refractory ceramic articles without the specified alumina content.
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 alumina content exceeds 50% and document the firing process
• Classify under 6903.20.00 and provide technical data to CBSA
• Ensure the tubes are not electrical insulators, which are excluded under Chapter 69 note 2(f)
Related Products under Tariff item 6903.20.00
Alumina Ceramic Retort for Chemical Processing
Fired alumina retorts containing over 80% alumina by weight, designed for high-temperature chemical reactions and distillation processes. These refractory vessels withstand corrosive environments and thermal shock, meeting the criteria for tariff item 6903.20.00 as articles with more than 50% alumina.
Alumina Ceramic Support for Catalyst Bed
High-alumina ceramic support structures containing over 65% alumina by weight, fired at high temperatures for use in industrial catalyst beds within petrochemical processing. These refractory goods provide structural integrity and thermal stability, qualifying under tariff item 6903.20.00 as articles containing more than 50% alumina.
Alumina Crucible for Laboratory Use
High-purity alumina crucibles containing over 90% alumina by weight, fired above 800°C for laboratory use in melting metals or chemicals. These refractory articles meet the Chapter 69 note 1(b) firing requirement and qualify under tariff item 6903.20.00 due to their high alumina content.
Alumina-Silica Kiln Furniture Shelf
Refractory kiln furniture shelves made from a 60% alumina-40% silica mixture, fired at high temperatures for supporting ware in ceramic kilns. These goods contain more than 50% alumina and silica combined, meeting the criteria for tariff item 6903.20.00.
Alumina Thermocouple Protection Tube
Fired alumina ceramic tubes with 99% alumina content, designed to protect thermocouples in high-temperature furnaces and kilns. These refractory components are essential for temperature measurement and qualify under tariff item 6903.20.00 due to their high alumina content.
High-Alumina Ceramic Nozzle for Continuous Casting
Refractory nozzles made from an alumina-silica mixture with over 70% alumina content, fired for use in steel continuous casting to control molten metal flow. These ceramic components withstand extreme temperatures and qualify under tariff item 6903.20.00 due to their high alumina content.