fr4 pcb
FR4 PCB (Flame Retardant 4 Printed Circuit Board) represents a fundamental component in modern electronics manufacturing, serving as the backbone for countless electronic devices and systems. This versatile substrate material consists of multiple layers of fiberglass reinforced epoxy laminate, which provides exceptional mechanical strength and electrical insulation properties. The FR4 designation specifically indicates its flame retardant characteristics, meeting UL94V-0 standards for fire safety. The material features a distinctive green solder mask, though it can be manufactured in various colors to meet specific requirements. FR4 PCBs typically offer a glass transition temperature (Tg) ranging from 130-140°C, making them suitable for most commercial and industrial applications. The material's excellent electrical properties, including a dielectric constant of approximately 4.2-4.8, ensure reliable signal transmission and minimal interference. These boards can be manufactured in single layer, double layer, or complex multilayer configurations, supporting diverse circuit designs and applications from simple consumer electronics to sophisticated industrial control systems.