... Board 3.SGS,UL&ROHS Approval 4.Thermal consideration Immersion gold plated PCB prototype PCB process capability:1.Layer: 2-22 ... Tg 4.Copper Thickness: 140micron(4oz)5.Min Board Thickness: 0.4mm6.Max Board Thickness: 5.0mm7.Min finished Hole Diameter: ... coating: Lead Free HAL, HAL, Flash Gold, Immersion Gold, Immersion Tin, Immersion Silver, OSP, Gold Finger Plating, Carbon Ink Printing, Peelable Blue ...