Copper Alloy Wafer Chuck for Crystal Puller from Mexico
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 — Mexico → United States
25%
Rate breakdown
9903.82.0925%Except as provided for in headings 9903.82.16, 9903.82.20–9903.82.26 and 9903.85.68, articles of copper and derivative aluminum and steel articles, as provided for in subdivisions (c)(vi)–(viii) and (xi) of U.S. note 16 to this subchapter
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
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