Diffusion Furnace Quartz Tube Liner from China
High-purity fused quartz liner inserted into diffusion furnace tubes for dopant diffusion into semiconductor wafers during device fabrication. Classified under HTS 8417.90.00.00 as parts of nonelectric industrial furnaces critical to semiconductor processing. Prevents contamination during high-temperature (900-1200°C) diffusion processes.
Duty Rate — China → United States
38.9%
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
• Certify quartz purity (OH content <10ppm) with test reports; declare liner function specific to diffusion furnaces; distinguish from generic laboratory quartzware