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NEMA Grade G-3 (GPG) Glass-Phenolic Laminate

NEMA grade G-3 is a grade of NEMA laminate. The graph bars on the material properties cards below compare NEMA grade G-3 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

230 MPa 34 x 103 psi

Flexural Modulus

9.3 GPa 1.3 x 106 psi

Flexural Strength

130 MPa 19 x 103 psi

Impact Strength: Notched Izod

320 J/m 6.0 ft-lb/in

Rockwell M Hardness


Tensile Strength: Ultimate (UTS)

150 MPa 22 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

160 °C 310 °F

Thermal Expansion

18 µm/m-K

Other Material Properties


1.7 g/cm3 100 lb/ft3

Dielectric Strength (Breakdown Potential)

21 kV/mm 0.83 V/mil

Water Absorption After 24 Hours

2.1 %

Common Calculations

Strength to Weight: Axial

25 points

Strength to Weight: Bending

38 points

Followup Questions

Further Reading

NEMA LI 1: Industrial Laminated Thermosetting Products

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