Mercury Arc Rectifier Gas Tube from Mexico
Mercury arc rectifier tubes convert AC to DC using ionized mercury vapor in a vacuum envelope, historically used in industrial power supplies. Though largely obsolete, they remain classified as gas-filled electron tubes under HTS 8540.89.0020.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Declare mercury content accurately due to hazardous material shipping requirements
• Provide proof of intended industrial/legacy use vs. modern semiconductor replacement
• EPA import notifications required for mercury-containing tubes