Ultra-PURE oxygen-FREE COPPER ingots Chemical purity and composition are determined in accordance with the most well - known standards-GOST 859-2001 (Russia), ASTM B170 (USA). We have obtained stable guaranteed results and produced an experimental product of the highest quality ultra-Pure oxygen-free copper in ingots. Characteristics: Chemical purity 99.9995 – 99.99999+ % (GOST 859-2001, ASTM B170) electrical conductivity 104 – 105% IACS RRR > 1500 – 2000 – ... ? Similar to a single crystal. Shape and dimensions of ingots: Shape close to cylindrical Diameter 88-93 mm Length/height 100-150 mm (typical 120-130 mm).