FR 4 Materials Standard High Tg Halogen Free
FR‑4 Materials – Standard, High‑Tg, Halogen‑Free: The Complete Guide for PCB Design and Manufacturing Introduction: Why FR‑4 Matters in PCB Production FR‑4 (Flame Retardant 4) is the most widely used substrate material in the printed circuit board (PCB) industry, accounting for over 90% of all rigid PCBs manufactured globally. It is a glass-reinforced epoxy laminate…