... -service 4.ISO9001:2000, UL, ROHS 2 layers PCBSuntech corporation Ltd specializ in Double Side PCB, Multi-Layer PCB, F4BK PCB, Ceramic PCB, Rogers PCB, Aluminum PCB.Layer: 2 ... Layers Material: ceramic, F4BK , Alu, Rogers, High Tg FR-4, FR-1, CEM1,CEM3, FR-4 ...