Copper Alloy Wafer Chuck for Crystal Puller from China
Precision-machined copper alloy chuck used to hold semiconductor wafers or boules in crystal growers and pullers (Czochralski method) under heading 8430. Its high thermal conductivity ensures uniform heating during monocrystalline silicon boule formation. Falls under 8431.49.90.92 as a copper alloy part principally for 8430 semiconductor machinery.
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
• Include technical drawings proving sole use in Czochralski pullers to meet 'solely or principally' criteria
• Test reports on thermal conductivity and copper content essential for customs valuation and classification