FR4 Epoxy Plate
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FR-4 or FR4 Epoxy Resin Plate is most commonly used as an electrical insulator possessing considerable mechanical strength. The material is known to retain its high mechanical values and electrical insulating qualities in both dry and humid conditions. These attributes, along with good fabrication characteristics, lend utility to this grade for a wide variety of electrical and mechanical applications.
NEMA is the regulating authority for FR4 Epoxy Resin Plate and other insulating laminate grades. Grade designations for glass epoxy laminates are: G10, G11, FR4, FR5 and FR6. Of these, FR4 is the grade most widely in use today. G-10, the predecessor to FR-4, lacks FR4's self-extinguishing flammability characteristics. Hence, FR4 has since replaced G10 in most applications.
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