... reasonable price 3.UL,ISO9001,ISO14001,TS16949,CE,. 4 Layer rigid PCB 4 Layer rigid PCB4 Layer rigid PCB 1.Our products are applied extensively ... Halogen Free,FR-1,FR-23Board thickness0.2mm-7mm4Max.finished board side500mm*500mm5Min.drilled hole size0.25mm6min.line width4mil7min.line spaceing4mil8Surface ...