Industrial Kiln Ceramic Insulator Tubes
Industrial kiln ceramic insulator tubes are high-temperature alumina tubes used to insulate heating element wires in electric kilns and furnaces, operating up to 1700°C. They provide electrical isolation in oxidizing atmospheres. These tubes are classified under tariff item 8546.20.00 as ceramic electrical insulators.
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 the tubes are imported as parts of electric industrial furnaces or ovens
Parts of electric industrial furnaces and ovens are classified under heading 85.14.
If the tubes are made of materials other than ceramics or glass
Other electrical insulators not made of ceramics or glass fall under this residual subheading.
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
• Document the maximum operating temperature and alumina content to support the classification as ceramic insulators
• If the tubes are imported with heating elements, they may be classified as parts of furnaces, so ensure the invoice clearly separates the components
• Verify that the tubes are not considered parts of machines excluded by Section Note 1
Related Products under Tariff item 8546.20.00
69kV Suspension Disc Insulators
Porcelain disc suspension insulators rated at 69kV, used in strings for overhead transmission towers. Each cap-and-pin unit provides high mechanical strength and contamination resistance. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
Alumina Ceramic Feedthrough Insulator
A hermetically sealed 99.5% alumina ceramic feedthrough insulator designed for high-vacuum systems, allowing conductors to pass through barriers while maintaining electrical insulation. It is used in RF and microwave applications where vacuum integrity and insulation are critical. This product falls under tariff item 8546.20.00 as it is a ceramic electrical insulator.
Alumina Ceramic Post Insulators
Alumina ceramic post insulators are cylindrical supports made from 95% alumina ceramic, designed for use in electrical substations to support busbars and equipment up to 36kV. They provide high puncture resistance and tracking resistance, making them suitable for polluted environments. These insulators fall under tariff item 8546.20.00 as they are electrical insulators made of ceramics.
Alumina Ceramic Spool Insulator
A precision-machined spool-shaped insulator made from 95% alumina ceramic, used in electrical coils and transformers to support and insulate wires. It prevents electrical short circuits and provides mechanical stability. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
Alumina Ceramic Suspension Insulator
This high-purity alumina ceramic insulator is used in strings for overhead power transmission lines at 132kV and above in low-frequency AC systems. It provides superior puncture resistance and is capped with forged steel fittings for mechanical strength. As a ceramic insulator, it is classified under tariff item 8546.20.00.
ANSI C29.2 Suspension Insulators
These porcelain suspension insulators conform to ANSI C29.2 specifications and are designed for 115kV transmission lines. The fog-type design resists surface contamination and provides superior flashover protection in polluted environments. As ceramic electrical insulators, they fall under tariff item 8546.20.00.