Copper Foil in China 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 in China 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.