Zirconium Thermocouple Sheaths from United States
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).
Duty Rate — United States → Canada
Import Tips
• 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