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

 In Thermoset Plastics

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Glass-Epoxy (G-10, FR4, G-11) Characteristics

Epoxy resins are widely used in electronic applications because they are virtually impervious to moisture. As a thermoset material, glass epoxy has outstanding mechanical and electric strength as well as good dielectric properties.

FR4 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 of thermosets for fabricated components for many electrical and mechanical applications. S

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

See the chart below for FR4 material properties, G-10 material properties and G-11 material properties, including specific heat of FR4.

Applications for G-10, FR4 and G-11 Thermosets

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

Contact a Dielectric Manufacturing knowledge expert to discuss the use of epoxy resins for fabrication of your parts. Call 800-367-9122 or email

Glass Epoxy Material Properties

Property Metricunits Englishunits
Density1.9e3 - 2.1e3kg/m^30.0686 - 0.0759lb/in^3 USD/lb
Yield Strength6.5e7 - 7e7Pa9.43 - 10.2ksi
Tensile Strength7e7 - 7.5e7Pa10.2 - 10.9ksi
Elongation0.008 - 0.01% strain0.8 - 1% strain
Hardness (Vickers)1.77e8 - 2.06e8Pa18 - 21HV
Impact Strength (notched)2.11e3 - 3.82e3J/m^21 - 1.82ft.lbf/in^2
Fracture Toughness8e5 - 1.1e6Pa/m^0.50.728 - 1ksi/in^0.5
Young's Modulus1.2e10 - 1.4e10Pa1.74 - 2.0310^6 psi
Max Service Temperature122 - 138°C252 - 280°F
Insulator or ConductorInsulatorInsulator
Specific Heat Capability1.2e3 - 1.4e3J/kg °C0.287 - 0.334BTU/lb. °F
Thermal Expansion Coefficient2.2e-5 - 2.4e-5strain/°C12.2 - 13.3µstrain/°F
CO2 Footprint4.17 - 4.61kg/kg4.17 - 4.61lb/lb