FR-4 is a designation for a flame-retardant material grade, indicating a material specification that must be able to self-extinguish upon combustion. It is not a material name but a material grade. Therefore, there are many types of FR-4 material grades used in general circuit boards, but most are based on the so-called four-function (Tera-Function)Epoxy resinAddedFilling agent(Filler) andGlass FiberThe actions takenComposite materials。

FR-4Epoxy glass fabric laminated boardFR-4 Epoxy Glass Cloth, depending on the application.Insulating boardEpoxy boardEpoxy Resin Boards、Brominated epoxy resinPlates, FR-4,Glass fiber boardFiberglass boards, FR-4Reinforcement plate、FPCReinforcement plateFlexible Printed CircuitReinforcement plates, FR-4 epoxy boards, flame-retardant insulating boards, FR-4 laminated boards, epoxy boards, FR-4 plain boards, FR-4 glass fiber boards.Epoxy glass fabric boardEpoxy glass fabric laminates, PCB drilling pads. Main technical features and applications: electrical insulation [1]Stable,FlatnessGood, smooth surface, noDimplingStandard thickness tolerance, suitable for products requiring high-performance electronic insulation, such as FPC reinforcing boards.PCBDrilling Pad, Glass FiberMeson、PotentiometerCarbon Film Printed Glass Fiber Plate, Precision Planetary Gear (Crystal Grinding), Precision TestingLumberInsulating bars, insulating pads, transformer insulating plates, motor insulating parts, grinding gearsElectrical SwitchInsulating boards, etc.