Photomultiplier Tube PMT from Mexico
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.
Duty Rate — Mexico → Canada
Import Tips
• 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