Mercury Arc Rectifier Gas Tube from Canada
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 — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
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