Customized special FR4 epoxy fiberglass boards are composite materials that are widely used in the electronics industry. FR4 is a flame-retardant grade of fiberglass-reinforced epoxy laminate, known for its excellent electrical insulation properties and high mechanical strength. These boards are typically used for applications such as printed circuit boards (PCBs), where electrical insulation and mechanical support are critical. It's important to consult with specialized manufacturers or supplie