8540.20.40.00/Photomultiplier Tube PMT/Japan

Photomultiplier Tube PMT from Japan

Photomultiplier tubes (PMTs) use photocathodes to detect low-level light via electron multiplication for scintillation counters and spectroscopy. Falls under HTS 8540.20.4000 as 'other photocathode tubes.' Essential for particle physics and medical imaging detectors.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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Import Tips

• Specify quantum efficiency and gain factors in entry docs; often requires end-user certificates for radiation detection uses

• Avoid bulk import misclassification as semiconductor devices