Silicon Nitride Thermowell from Mexico
Silicon nitride ceramic thermowell protecting temperature sensors in petrochemical furnaces. HTS 6903.90.00 refractory tubes/sheaths for high-corrosion environments. Advanced nitride ceramics fired per Chapter requirements.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Petrochemical end-use certification; prove >1400°C service temperature
• Avoid Chapter 85 sensor classification by importing separately