Zirconium Thermocouple Sheaths
Zirconium thermocouple sheaths are protective tubes made of zirconium used to shield thermocouples in molten metal monitoring. They are classified under tariff item 8109.99.00 as other articles of zirconium because they are not covered by the specific forms in Chapter 81 (tubes and pipes have a uniform cross-section and wall thickness, while sheaths may be closed at one end or have fittings).
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 |
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 that the sheaths are not classifiable as tubes or pipes under 8109.90.00, as they may have closed ends or other features that make them articles
• Provide a product description showing the zirconium material and the specific design
• If the sheaths are part of a complete thermocouple, consider whether they should be classified with the instrument under Section XVIII
Related Products under Tariff item 8109.99.00
Zirconium Anode Bars
Zirconium anode bars are solid, fabricated zirconium products shaped specifically for use as anodes in electroplating baths. They are classified as other articles of zirconium under tariff item 8109.99.00 because they are not covered by the specific forms (bars, rods, plates, etc.) defined in Chapter 81 legal notes, and they are not parts of general use.
Zirconium Cladding Sheets
Zirconium cladding sheets are thin, flat-rolled zirconium products used to clad nuclear fuel rods. They fall under tariff item 8109.99.00 as other articles of zirconium because they are not within the definition of plates, sheets, strip, or foil in Chapter 81 (their thickness exceeds one-tenth of width, or they are shaped for a specific use).
Zirconium Crucibles
Zirconium crucibles are high-purity, fabricated containers used to melt and hold reactive metals in laboratory and foundry settings. They are classified under tariff item 8109.99.00 as other articles of zirconium because they are not covered by the specific forms defined in Chapter 81 (bars, rods, wire, plates, tubes, etc.).
Zirconium Electrical Contacts
Zirconium electrical contacts are rivets and contact points made of zirconium for high-reliability switches and electrical equipment. They are classified under tariff item 8109.99.00 as other articles of zirconium, as they are not covered by the specific forms in Chapter 81 and are not parts of general use (which are excluded by Section XV Note 2).
Zirconium Evaporation Boats
Zirconium evaporation boats are fabricated zirconium containers used for thermal evaporation in thin-film deposition processes, particularly in semiconductor manufacturing. They are classified under tariff item 8109.99.00 as other articles of zirconium because their specialized shape and function distinguish them from plates, sheets, or other semi-finished forms.
Zirconium Fasteners
Zirconium fasteners, including bolts, nuts, and screws, are fabricated zirconium articles used in corrosive environments such as offshore oil platforms. They are classified under tariff item 8109.99.00 as other articles of zirconium, but they may be excluded if they qualify as parts of general use under Section XV Note 2.