Photomultiplier Tube PMT
A photomultiplier tube (PMT) that detects low-level light by using a photocathode to convert photons into electrons, which are then multiplied through a series of dynodes for highly sensitive signal detection. It is classified under tariff item 8540.20.00 as an 'other photo-cathode tube' because its operation depends on photoemission from a photocathode, making it essential for scintillation counters and spectroscopy.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the device is a solid-state photodetector such as an avalanche photodiode
Semiconductor-based photosensitive devices are classified under heading 85.41.
If imported as a part of a spectroscopy or chromatography instrument
Parts of instruments for physical or chemical analysis are classified in Chapter 90.
If imported as a replacement part without the photocathode assembly
Parts of thermionic or photo-cathode tubes are classified separately under 8540.99.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Declare the PMT under 8540.20.00 and include the photocathode type (e.g
• bialkali, multialkali) in the commercial invoice to avoid delays
• If the PMT is part of a scientific instrument, consider whether the complete instrument classification under Chapter 90 is more appropriate
• Check if the PMT contains hazardous materials like beryllium oxide, which may require additional CBSA documentation
Related Products under Tariff item 8540.20.00
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