FR-4 is a code name for a flame resistant material. It means a material specification that the resin material must be self-extinguishing after being burned. It is not a material name but a material grade.

FR-4 epoxy fiberglass board, the main material is prepreg, the color is white, yellow, green, still has high mechanical strength at 150 °C at normal temperature, good electrical properties in dry and wet state, flame retardant, used for electrical, Insulation structural parts such as electronics.

Features - FR4 pcb Material
FR-4 epoxy fiberglass cloth substrate is a kind of substrate with epoxy resin as binder and electronic grade glass fiber cloth as reinforcing material. Its bonding sheet and inner core thin copper clad plate are important substrates for making multilayer printed circuit boards.

Performance - FR4 pcb Material
The epoxy fiberglass cloth substrate has higher mechanical properties, dimensional stability, impact resistance, and moisture resistance than paper substrates. Its electrical performance is excellent, its operating temperature is high, and its performance is less affected by the environment. In the processing technology, it has greater advantages than other fiberglass fiber substrates. These products are mainly used for double-sided PCBs and are used in large quantities.