Fused Quartz Diffusion Tube from China
A high-purity fused quartz tube designed for insertion into diffusion furnaces used in semiconductor wafer production. It withstands extreme temperatures and corrosive gases during the doping process. Classified under HTS 7020.00.30.00 as a specialized quartz article for semiconductor manufacturing equipment.
Duty Rate — China → United States
37.5%
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
• Verify purity certification (SiO2 >99.99%) to confirm fused quartz classification per Chapter 70 notes
• Include technical specs and end-use statements proving semiconductor furnace application to avoid reclassification
• Ensure proper documentation of thermal shock resistance (>1000°C) as common CBP scrutiny point