[quote author="strangeandbouncy"] Oxygen free [/quote]
Oxygen free copper is good for making tubes.
I do not know, how improve it electrical parameters;
I mean, that it is impossible to change 10 percent in resistivity.
there are other chemicals in copper than oxygen,
and they can modify mainly mechanical parameters.
... And mechanical parameters. They are widely changed
by copper recrystalisation.
In direct metal mastering disc cutters, they are used electrolytic
copper. And after electrolysis, copper blank disc are stocked in
refrigerator. ... maximally three days.
For a longer time they are so rigid, that Neumann cutting machine
can do good cut into they.
Buy copper cables in the winter and maximally one week old
and put it the some day you buy. And listen it in the refrigerator
xvlk