Ignitron Mercury Pool Tube
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when imported with welder control circuitry
Complete arc welding assemblies classify under welding machines.
If cold cathode gas discharge type
Cold cathode construction shifts to different tube subheading.
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Import Tips & Compliance
• 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
Related Products under HTS 8540.89.00.20
Thyratron Gas-Filled Switching Tube
A thyratron is a gas-filled electron tube used for high-power switching applications in industrial controls and pulsed power systems. It operates by ionizing gas between electrodes to conduct current, fitting under HTS 8540.89.0020 as a gas electron tube distinct from vacuum or photocathode types.
Hydrogen Thyratron Pulse Modulator Tube
Hydrogen thyratrons are specialized gas electron tubes designed for radar pulse modulators and high-voltage switching in scientific instruments. The low-pressure hydrogen gas enables fast switching, qualifying as a vapor electron tube under HTS 8540.89.0020.
Mercury Arc Rectifier Gas Tube
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Deuterium Stabilized Gas Laser Tube
Deuterium gas laser tubes provide stable UV output for spectroscopy using gas discharge excitation. The sealed tube contains deuterium at low pressure, classifying as a gas electron tube under HTS 8540.89.0020 despite laser application.
Argon Ion Gas Laser Tube
Argon ion laser tubes generate blue-green laser light through electrical discharge in argon gas, used in scientific research and holography. Classified as gas-filled electron tubes under HTS 8540.89.0020 based on tube construction.
Magnetron Gas-Filled Amplifier Tube
Gas-filled magnetron tubes amplify microwave signals using crossed-field electron interaction in low-pressure gas. Used in radar amplifiers, they classify as gas electron tubes under HTS 8540.89.0020.