PCB Supplier 1) Thickness: 0.1mm-5mm 2) Minimum linewidth0.075mm/3mil 3) Minimum gap0.065/2.8mil 4) Minimum aperture inradium0.15mm 5) Minimum aperture external diameter0.45mm 6) Minimum BGA: 0.2mm 7) Layer 4 layers through hole non-impedance All multilayer boards are printed with 36t screen, the resistance welding oil is 50 tons thicker than the traditional 43t, which provides reliability guarantee for the bga and more precise fine lines.