CEM1 CEM3 PCB

http://www.wonderfulpcb.com/CEM1-CEM3-PCB.html
CEM1 PCB,CEM3 PCB
CEM1 material is for single side pcb only, it is the better than FR1 and FR2 material, the CEM3 is a new material replace to FR4, because the production cost will cheaper, it is normal use to 2 layer PCB.