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• 101 is 99.99% copper, 110 is 99.90%, 101 offers superior electrical conductivity.

• But how much more conductive is 101?

  • From McMaster-Carr both 101 and 110 have the same surface resistivity and thermal conductivity (10.3 Ohms, 226 Btu/hr. × ft./°F @ 68 ° F) when annealed.

  • Other sources have 101 and 110 at the same electrical conductivity rating of 101 (% IACS at 68F (20C) annealed.) [4] [5]

• Both have similar yield strengths when annealed

• 101 slightly more expensive

• For a 12”x12”x0.062” sheet:

  • 110 is $54.34

  • 101 is $62.99

• They come in different thicknesses, 110 has a greater selection of choices, do we have a preference for thickness?

• Busbars modeled as 1.5mm thick in CAD, 1.5mm ~ 0.06”

Final Recommendation

wipMy final recommendation would be to go with the 101 superconductive copper. There should be a slight benefit in conductive performance due to the higher percentage of pure copper, which would reduce the amount of heat produced by the busbars. The slight increase in costs seems negligible, and therefore I would recommend going with 101 superconductive copper. But if the budget is an issue, 110 multipurpose should provide a very similar performance at a slightly lower cost. I would also recommend going with softened (annealed) tempered sheets. The annealed sheets are softer and should be easier to form, bend into shape or modify. They are also cheaper than the harder temper sheets (1/8, 1/4, 1/2). The lower strength should not be an issue since the busbars are not supporting any loads.

Links

[1]https://www.mcmaster.com/copper-sheets/

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