China Advange PCB Product introduction: Hard Gold PCB Hard Gold PCB Plate thickness: 1.5MMWarpage: less than 1% Inner copper thickness: 0.5OZImpedance control:+/- 5% Outer copper thickness: 1OZProcess: gold sinking+gold finger 3 ' 聽 2銆丏efinition and function of PCB gold finger: Hard Gold PCB refers to a row of equidistant square pads, exposed copper gold plated. Used for board card, LCD...