Silicon Carbide Thermocouple Tube from Canada
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 — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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