Copper Alloy RF Window for Wafer Polisher Vacuum Chamber from Canada
Vacuum-tight copper alloy RF window for microwave coupling in wafer polishers and lappers (heading 8426). Enables plasma-assisted polishing for flat semiconductor wafer surfaces. 8431.49.90.92 for copper parts of semiconductor processing equipment.
Duty Rate — Canada → United States
25%
Rate breakdown
9903.82.0925%Except as provided for in headings 9903.82.16 and 9903.85.68, articles of copper and derivative aluminum and steel articles, as provided for in subdivisions (c)(vi)–(viii) of U.S. note 16 to this subchapter
9903.03.060%Articles of aluminum, of steel, or of copper or derivative aluminum or steel articles; passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans, and cargo vans) and light trucks; parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans, and cargo vans) and light trucks; medium- and heavy-duty vehicles; parts of medium- and heavy-duty vehicles; wood products; and semiconductor articles, of any country, as provided in subdivision (aa)(v) of U.S. note 2 to this subchapter
Import Tips
• RF transmission specs and vacuum rating docs confirm semiconductor-specific design
• Label as 'not for general lab use' to prevent 8419 reclassification