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</html><thumbnail_url>https://www.raypcb.com/wp-content/uploads/2021/09/fr4-pcb.jpg</thumbnail_url><thumbnail_width>1920</thumbnail_width><thumbnail_height>800</thumbnail_height><description>Printed Circuit Boards (PCBs) serve as the foundation for countless devices most electrical engineers use daily. Among the various materials used in PCB manufacturing, FR4 stands out as the most widely used substrate. In fact, FR4 PCBs are found in an astounding 80% of electronic boards. But what makes FR4 so popular, and why do [&hellip;]</description></oembed>
