Float Zone Crystal Grower Vacuum Pump Rotor from China
The rotor assembly for hermetic vacuum pumps in float zone crystal growers, enabling ultra-high vacuum (UHV) conditions for producing pure monocrystalline semiconductor rods from polycrystalline silicon. This part handles the compression of process gases during zone melting. Falls under 8414.90.41.55 as a component of 8414.40 compressors in semiconductor wafer manufacturing apparatus.
Duty Rate — China → United States
35%
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
• Provide process flow diagrams demonstrating UHV compressor role in float zone method to confirm semiconductor classification
• Label with material certifications (e.g
• non-contaminating alloys) required for cleanroom compatibility
• Avoid misclassification as general pump parts (8413.91); specify hermetic compressor integration for 8414.40 subheading