... .. % (Max.)Total impurities...0.3.. % (Max.)No. 1 cooper Copper Wire level 1: including without bare, No coating, without the pure ... alloys, surface non oxidation, excluding the hair silk, the Copper Wire 1.6 mm diameter should not be less than. Level ... clean, without luster, no coating, wuxi, without the pure copper alloy wire and cable, excluding wool yarn and burnt the fragile copper ...