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NEMA Grade FR-5 (GEB-F) Glass-Epoxy Laminate

NEMA grade FR-5 is a grade of NEMA laminate. The graph bars on the material properties cards below compare NEMA grade FR-5 to other thermoset plastics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Compressive (Crushing) Strength

330 MPa 47 x 103 psi

Flexural Modulus

18 GPa 2.6 x 106 psi

Flexural Strength

340 MPa 50 x 103 psi

Impact Strength: Notched Izod

330 J/m 6.3 ft-lb/in

Rockwell M Hardness


Shear Strength

130 MPa 19 x 103 psi

Tensile Strength: Ultimate (UTS)

260 MPa 37 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

180 °C 350 °F

Thermal Expansion

10 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

18 kV/mm 0.69 V/mil

Otherwise Unclassified Properties


1.9 g/cm3 120 lb/ft3

Water Absorption After 24 Hours

0.17 %

Common Calculations

Strength to Weight: Axial

39 points

Strength to Weight: Bending

49 points

Followup Questions

Further Reading

NEMA LI 1: Industrial Laminated Thermosetting Products

Thermosets: Structure, Properties and Applications, Qipeng Guo (editor), 2012