... /H,H/0,0/0,1/1,1/H. Copper Clad Laminated SheetIFR4 Copper Clad LaminateThickness:0.6mm,0.8mm,1.0mm,1.2mm,1 ... and outer impurity which retard its use are not allowed .4) Usually used in PCB of computers, home electric appliances and ... other lines.FR4 ccl technical date: FR4 TECHNICAL DATA SHEET NOITEMUNITINDEX1Surface resistance after damp heat and recoveryMΩ1.3x1052Volume resistivity ...