FR4’s formal writing model is FR-4.
FR-4 Epoxy Glass Cloth Laminated Sheet, according to the different application, the industry generally known as FR-4 Epoxy Glass Cloth、Insulation Board、Epoxy Board、Epoxy Resin board、Brominated epoxy resin board、FR-4、Fiberglass board、Glass fiber board、FR-4 reinforced board、FPC reinforced board、Flexible board reinforced board、FR-4 epoxy resin board、Flame – retardant insulation board、FR-4 Laminated Sheet、Epoxy Glass Cloth Board、FR-4 light board、FR-4 glass fiber board、Epoxy glass cloth plate、Epoxy glass cloth laminated board、PCB board drilling plate.
Main technical characteristics and applications: stable electrical insulation、flatness、smooth surface、no pits、thickness tolerance standards、suitable for high-performance electronic insulation products, such as FPC reinforced board、PCB drilling plate、Glass fiber meson、Potentiometer Carbon Fiber Printed Fiberglass Plates, Precision Planetary Gears (Wafer Grinding)、Precision Testing Plates、Electrical (Electrical) Equipment Insulation Strip Baskets、Insulation Boards、Transformer Insulation Boards、Motor Insulators、Grinding Gears 、Electronic switch insulation board, etc.

FR4 epoxy glass cloth laminated board‘s surface color: yellow FR-4, white FR-4, black FR-4, blue FR-4 and so on.

FR-4 is the substrate used by the PCB, is a kind of sheet. Sheet mainly has the following four kinds according to different materials
FR-4: glass cloth substrate
FR-1、FR-2 and so on: paper substrate
CEM series: composite substrate
Special materials substrate(ceramic、metal base, etc), FR-4 is that the special electronic cloth coated with epoxy phenolic resin and other materials, after high-temperature、high-pressure、hot-pressed, then forming laminated sheet products.
Characteristics: it has a high mechanical properties and dielectric properties, good heat resistance and moisture resistance, also has good mechanical processing.
Application: electrical machinery、insulation structural parts in electrical equipment, including the style of the switch、FPC reinforcement、electrical insulation、carbon film printed circuit boards, computer drilling pads, mold fixtures, etc. (PCB test frame) , also can be used in the wet conditions and transformer oil .