Project Parameter Minimum line width / wire gap (Mil) 3/3mil Minimum welding ring(Mil) Conventional unilateral size: 5mil, the minimum unilateral width after cutting copper:   4Mil Element hole single side size: 8Mil, cut copper after the minimum unilateral width for：6mil Minimum aperture Mechanical hole 0.10mm Laser hole 0.075mm aspect ratio 10:1 Maximum plate thickness Single, double panel 6.0mm Multilayer board 6.0mm Minimum plate thickness Single, double panel 0.2mm Multilayer board 4 layer: 0.4 mm; 6 layer: 0.6 mm; 8 layers: 1.0 mm; 10 layers: 1.2 mm Biggest size Single, double panel 640 x1100mm Multilayer board 640 x1100mm Line to board edge distance Milling shape:0.20mm V-CUT: 0.4mm Maximum number of layers 24 layers Resistance welding Green window(Mil) 2mil Green oil bridge(Mil) Green oil: 4mil, variegated ink: 5mil Colour White, black, blue, green, yellow, red, dumb black, dumb green and so on character Minimum line width(Mil) 5mil Colour White, yellow, black and so on. Surface treatment Spray tin, nickel plating / gold, chemical nickel / gold, Shen silver, Shen tin, anti-oxidation and so on. Hole plating (micro inch) Copper layer thickness 800 1000 Bottom copper thickness Inside and outside the copper thick（oz）  1/3 6 Finished copper thick Outer layer 1 6.5 Inner layer 0.5 6 Plate type FR4 High frequency plate Aluminum plate(Berquist,thermagon   Made Al base) impedance Impedance tolerance range ±5% Capacity project Metal substrate Soft and hard combination board Embedded capacitive board Embedded resistive plate IC package substrate