Ignitron Mercury Pool Tube from Mexico
Ignitrons are high-current mercury pool gas tubes for welding control and electrolytic processes, igniting mercury vapor arc for conduction. They qualify under HTS 8540.89.0020 as vapor electron tubes.
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
• Hazardous material declaration mandatory due to mercury pool content
• Specify current rating (>1000A typical) to distinguish from lower-power tubes
• Mounting flange dimensions affect packaging classification