... , 1.6mm selectable Cu thickness: 2.5OZ Solder mask: PC401, Green oil mask with double side Surface finished process: Immersion ... and E-test Workmanship compliant with ISO9001: 2000 ROHS Compliant1Layer1-22 layer2MaterialFR-1,FR-2,FR-4,CEM-1,CEM ... battery,fire alarm,CCTV, wireless communication,telecommunication, networking, printer and house controller 2 Layers and 2.5oz PCB with E-Test(PCB board )