FR-4

 

FR-4 (or FR4) is a grade designation assigned to glass-reinforced epoxy laminate sheets, tubes, rods and printed circuit boards (PCB). FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant (self-extinguishing). "FR" stands for flame retardant, and denotes that safety of flammability of FR-4 is in compliance with the standard UL94V-0. FR-4 is created from the constituent materials (epoxy resinwoven glass fabric reinforcementbrominated flame retardant, etc.) by NEMA in 1968. More

 

 

Trade Names: Atlas Fiber®, Acculam®, Micarta®

 

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