Sell Oxygen Free Copper Cu4N8 / Price USD 380.00 - 800.00 / Kg / Payment - L/C / Purity- not less than 99,999..% /; Quality - Official certificate of IASTS GIREDMET(Russia) and IGAS (Germany). Origin - Russian Federation. Technical characteristics of oxygen free copper: Not radiation, not explosion, not toxic does not contain precious metals, high corrosion - stability. Ingots from 1 kg or more.