Led Printed circuit board 1.PCB experience8 years 2.PCB certificate ... ≥5MΩ≥5MΩ≥5MΩ test voltage 50~100DCV300DCV300DCV finished board area 400×500mm500×600mm500×600mm Min line width&spacing ... plating Carbon ink,Peelable S/M,HASL(lead free),Immersion silver/tin,Color Green ,yellow, blue ,red black and ... so on Materail FR-4,Aluminium-backed board,Halogen-free, ...