... printed circuit board pcb 2.16layers with immersion gold 3.1.6mm printed circuit board pcb 4.UL ISO9001 certificate 5.Blue printed circuit board ... DescriptionDetails SpecificationBase MaterialFR-4,Aluminium-backed board,Halogen-free,Lead-free compatible,High ... platingProduction typeHigh precision multi-layer board,Blind hole board, Buyerd hole board,High frequency board,Aluminium backed ...