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
100
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
3.8
Dielectric Strength (Breakdown Potential)
18 kV/mm 0.69 V/mil
Otherwise Unclassified Properties
Density
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