Silicon Carbide Thermocouple Tube from Japan
Silicon carbide ceramic tube sheathing thermocouples in high-temperature furnaces up to 1600°C. HTS 6903.90.00 covers such refractory tubes and sheaths for industrial thermal protection. Composed of fired nonmetallic carbides per Chapter 69 definition.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include thermal conductivity specs proving refractory function; avoid electrical insulator classification by showing non-insulating use
• Pitfall: thin tubes mistaken for Chapter 70 glass tubing