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
100
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
Density
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