... 15.Minimum Insulation Thickness: 3mil16.Maximum laser blind hole thickness to diameter ratio: 0.8:117.Maximum working board size: ... 13mm21.Surface coating: Lead Free HAL, HAL, Flash Gold, Immersion Gold, Immersion Tin, Immersion Silver, OSP, Gold Finger Plating, Carbon Ink Printing, ... method for PCBAFactory View:All of the above description is to demonstrate the ability of our factory, if you have ...