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Fr4 Copper Clad Laminate

2019-10-29fr-4 or fr4 is a nema grade designation for glass-reinforced epoxy laminate materialr-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant self-extinguishingfr" stands for flame retardant, and does not denote that the material complies with the standard ul94v-0 unless testing is performed to ul 94, vertical flame testing in.

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