... of Producing & Testing Maximum Overall Diameter, Conductor Diameter, Film Thickness, Conductor Resistance, Elongation, Spring Back, Mandrel Winding, Sudden Jerk, ... Voltage Hole//Pin-Hole≤5pcs/6m1pcsConculusionOK3.Insulating Varnish for our enameled wire to guarantee quality.1) Polyester ... professional manufacturer of insulated wire High Thermal resistance Super insulated enamelled Aluminum wire