Photomultiplier Tube PMT from China
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 — China → United States
40.8%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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