... 2.29mm,1oz&0.5oz in inner layer,1oz on outer layer NO.ItemParameter1Number of Layers1-30Layers2Finished Boards ... Mechanical)0.05mm10Registration (Mechanical)0.075mm11Out Layer Copper Thickness35um--420um12Inner Layer Copper Thickness17um--420um13Aspect Ratio12:114SMT Mini. ... ,OSP,Gold finger,Peelable,Immerision Silver,19Insulation Layer Thickness0.075mm--5.00mm20Special technologyBlind hole PCB,Buried ...