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G10-FR4 Glass Reinforced Epoxy

(Micarta) (High Pressure Laminates) G10-FR4 Glass Reinforced Epoxy - natural (yellowish to light green) Technical Data Sheet Chemical Resistance Chart
The most versatile all-around laminate and composite, this grade is a continuous glass woven fabric base impregnated with an epoxy resin binder. It has extremely high mechanical strength, good dielectric loss properties, and good electric strength properties, both wet and dry. NEMA grades G10 and FR4 Glass-Cloth Reinforced Epoxy -- natural color is typically a yellowish to light green. The most versatile all-around laminate grades are continuous glass woven fabric impregnated with an epoxy resin binder. (Epoxy resins are among the most versatile and widely used plastics in the electronics field, primarily because water absorption is virtually nil, rendering it an outstanding insulator. Beyond its electrical insulating properties, epoxy resins exhibit superior adhesive properties and great dimensional stability -- shrinkage is usually less than 1 percent.) G10/FR4 has extremely high mechanical strength, good dielectric loss properties, and good electric strength properties, both wet and dry. The main difference between NEMA Grades G10 and FR4 is that FR4 is a fire retardant grade of G10. Therefore, FR4 can be safely substituted where G10 is called for, while G10 can never be substituted where FR4 is called for. NEMA grades G11 and FR5 Glass-Cloth Reinforced Epoxy -- natural color is typically yellow green to amber. This grade is similar to G10/FR4 with the addition of a higher operating temperature and some improved mechanical strength at elevated temperatures
NEMA G-10 certs to MIL-I-24768/2 GEE, IPC 4101/20, IEC 60893-3 Type 2 EP GC 201
NEMA FR-4 certs to MIL-I-24768/27 GEE-F, IPC 4101/21, IEC 60893-3 Type 2 EP GC 202