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Glass epoxy is an excellent choice for fabricated parts to be used in high-moisture environments

Glass-Epoxy (G-10, FR-4, G-11)

  • Good dimensional stability
  • Outstanding insulating and
    electrical properties
  • Moisture-resistant
  • Excellent flammability rating
  • UL listed


Epoxy resins are widely used in electronic applications because they are virtually impervious to moisture. Glass epoxy has outstanding mechanical and electric strength as well as good dielectric properties.

FR-4 is a fire-retardant grade of G-10 while the G-11 grade offers improved mechanical strength at higher temperatures. Epoxy resins are a good choice for many electrical and mechanical applications.


  • Power generation components
  • High-temperature applications
  • Structural parts
  • Printed circuit boards


Our application engineers can help. With decades of experience in plastic material selection, we'll help you choose the optimal plastic for your application and budget.


To compare
the cost of this material to other thermosets, click here.

General Material Properties

Property   Metric units   English units
Density   1.9e3 - 2.1e3 kg/m^3   0.0686 - 0.0759 lb/in^3 USD/lb
Yield Strength   6.5e7 - 7e7 Pa   9.43 - 10.2 ksi
Tensile Strength   7e7 - 7.5e7 Pa   10.2 - 10.9 ksi
Elongation   0.008 - 0.01 % strain   0.8 - 1 % strain
Hardness (Vickers)   1.77e8 - 2.06e8 Pa   18 - 21 HV
Impact Strength (notched)   2.11e3 - 3.82e3 J/m^2   1 - 1.82 ft.lbf/in^2
Fracture Toughness   8e5 - 1.1e6 Pa/m^0.5   0.728 - 1 ksi/in^0.5
Young's Modulus   1.2e10 - 1.4e10 Pa   1.74 - 2.03 10^6 psi
Max Service Temperature   122 - 138 °C   252 - 280 °F
Insulator or Conductor   Insulator   Insulator
Specific Heat Capability   1.2e3 - 1.4e3 J/kg °C   0.287 - 0.334 BTU/lb. °F
Thermal Expansion Coefficent   2.2e-5 - 2.4e-5 strain/°C   12.2 - 13.3 µstrain/°F
CO2 Footprint   4.17 - 4.61 kg/kg   4.17 - 4.61 lb/lb
Recycleable   No   No

The information on this page is intended as general guidance only and is only accurate at the time of posting (see date below). Specific material properties vary by manufacturer. Please contact a Dielectric application engineer for help in choosing the optimal material for your application and budget.

Posting Date: September 10, 2012