I have never seen Copper square tubing before. Aluminum square tubing is easy to find but I don't see to many pratical uses for square copper tubing so maybe that is why it is either hard to find or simply not made.
I know you can find Brass rectangle/sqaure tubbing though, usually for hand rails. Not sure what the heat charicteristics are as Brass and Copper are pretty much the same thing but different grades I think.
Just do a search in a search engine and it will bring some stuff up.
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