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Copper ingots are bars made of copper which have been cast into a specific shape, like rectangular, round, square, etc. Tianjin Ruiyuan provides high purity copper ingot composed of oxygen-free copper—also referred to as OFC, Cu-OF, Cu-OFE, and oxygen-free, high-conductivity copper (OFHC)—is formed by melting copper and combining it with carbon and carbonaceous gases. Elektrolizinis vario rafinavimo procesas pašalina didžiąją dalį deguonies, esančio viduje, todėl susidaro junginys, kurį sudaro 99,95–99,99% vario, kurio deguonis yra mažesnis arba lygus 0,0005%.