... temperature annealed, rust removing acid washing, drying copper, feeding wire coiling4 Appearance: smooth,shinning ,no burr,no oxidation5 Advantage ... cost while guaranting same quality as pure copper wire Copper coated flat wire 6 Application: used for telephone,electric railway ... According to the electrical conductivity, divid copper clad steel wire into 21%IACS, 30%IACS and 40%IACS. ...