FR4 PCB, FR4 PCB board, FR4 printed circuit board
FR4 means: F (for flame) and R (for retardancies) and the 4 is a # 4 epoxy.FR4 is a glass fiber epoxy laminate.FR4 is the Main material for PCB manufacture, it is the excellent quality and reasonable price material,there are many FR4 PCB in the market.
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