09/01/2026
Copper isn't one material choice. It's three, and picking the wrong one shows up in the quote.
C110 for standard electrical conductivity, the default for busbars and terminal blocks.
C101 for oxygen-free applications: welding, brazing, hydrogen exposure.
C145 when cycle time and tool wear matter more than peak conductivity.
Name the grade on the drawing. A drawing that just says "copper" leaves the choice to whoever has stock.
https://www.haizol.com/blog/copper-cnc-machining