Obsolete term for copper containing oxygen at about 0.03-0.07% which gave a level ‘set’ to the top of a wirebar when statically cast horizontally.
Obsolete term for copper containing oxygen at about 0.03-0.07% which gave a level surface free of shrinkage cracks to the top of a casting.
An obsolete term for Copper that has been cast with a deliberate Oxygen addition (typically 0.01 % - 0.05%) to improve electrical conductivity. The metal may have first been either the electrolytically or fire refined.