Vacuum Photomultiplier Tube PMT from China
A vacuum tube containing a photocathode that emits electrons when struck by photons, which are then multiplied to produce a measurable current. Classified under HTS 8540.89.00.80 as a photocathode tube not specifically covered by other subheadings in heading 8540. Used in scientific instruments like scintillation detectors.
Duty Rate — China → United States
38.7%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.88.0125%Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 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(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Import Tips
• Verify tube specifications match photocathode or vacuum tube definitions in Chapter 85 notes to avoid reclassification
• Provide detailed technical datasheets showing vacuum construction and electron multiplication process for CBP review