Copper foil processing is way over pure iron, and 50% of the copper is electrolytically purified into copper foil per annum, which is employed within the electrical industry. The copper foil processing mentioned here really has to be very pure, with a copper content of quite 99.95%. Very small amounts of impurities, especially phosphorus, aluminum, etc., can greatly reduce the conductivity of copper. Oxygen in copper (a touch of oxygen is definitely mixed in copper smelting) incorporates a great influence on electrical conductivity, and copper utilized in the electrical industry must generally be oxygen-free copper. additionally, impurities like lead, antimony, and bismuth will make the crystals of copper unable to mix together, causing hot brittleness and affecting the processing of pure copper.