... Dielectric properties FR4 Laminate Sheet is a glass fabric reinforcement in an epoxy resin binder. The natural color is ... PCB drilling pads,fiberglass meson,potentiometer,carbon film,printed glass fiber,precision planetary gear (chip grind),precision test ... boards,electrical insulation,grinding gears , electronic switches,insulation board and so on; Technical Data Sheet: ItemUnitValueFR4 sheetDensityg ...