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NEMA Grade GPO-3 (GPO N-2) Glass-Polyester Laminate

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

210 MPa 30 x 103 psi

Flexural Modulus

7.6 GPa 1.1 x 106 psi

Flexural Strength

120 MPa 18 x 103 psi

Impact Strength: Notched Izod

430 J/m 8.0 ft-lb/in

Rockwell M Hardness


Tensile Strength: Ultimate (UTS)

55 MPa 8.0 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

130 °C 270 °F

Thermal Expansion

20 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

0.45 %

Common Calculations

Strength to Weight: Axial

8.3 points

Strength to Weight: Bending

17 points

Followup Questions

Further Reading

NEMA LI 1: Industrial Laminated Thermosetting Products

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