Blister Copper Buttons from Mexico
Small button-shaped castings of blister copper from fire refining, serving as test samples or furnace charge. Under HTS 7402.00.00.00 as unrefined copper ahead of electrolytic refining. Typical 98-99% Cu with gas porosity characteristic of blister form.
Duty Rate — Mexico → United States
0%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Supply button assay results showing characteristic impurities (O2, S) of fire-refined blister copper
• Document intended remelt use in anode furnaces to confirm unrefined status
• Declare exact button weights; larger castings risk categorization as crude anodes