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Glass melamine is a good choice for fabricated parts that will be used in high-moisture environments

Glass-Melamine Laminate (G-5, G-9)

  • High physical strength
  • Excellent arc and flame resistance
  • Machining grade woven glass fabric
  • Excellent electrical properties in high humidity conditions


Melamines are the hardest of the laminates with good dimensional stability and arc resistance. G-5 and G-9 are machining-grade glass fabrics that retain excellent electrical properties in high humidity conditions. Both are flame-resistant and have high physical strength, good caustic-resistance and excellent arc resistance.

G-9 is a better choice for outdoor applications as it offers more resistance to the elements than G-5.


  • Arc barriers
  • Switch board parts
  • Electrical parts
  • Circuit breakers


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   1.6e3 - 2e3 kg/m^3   0.0578 - 0.0723 lb/in^3 USD/lb
Yield Strength   2.76e7 - 5.79e7 Pa   4.0 - 8.4 ksi
Tensile Strength   3.45e7 - 7.24e7 Pa   5 - 10.5 ksi
Elongation   0.00558 - 0.00645 % strain   0.558 - 0.645 % strain
Hardness (Vickers)   8.14e7 - 1.71e8 Pa   8.3 - 17.4 HV
Impact Strength (notched)   3.2e3 - 9.5e4 J/m^2   1.52 - 45.2 ft.lbf/in^2
Fracture Toughness   2.16e6 - 6.47e6 Pa/m^0.5   1.96 - 5.89 ksi/in^0.5
Young's Modulus   1.1e10 - 1.65e10 Pa   1.6 - 2.39 10^6 psi
Max Service Temperature   141 - 157 °C   286 - 315 °F
Insulator or Conductor   Insulator   Insulator
Specific Heat Capability   1.19e3 - 1.23e3 J/kg °C   0.283 - 0.295 BTU/lb. °F
Thermal Expansion Coefficent   7.2e-5 - 8.1e-5 strain/°C   40 - 45 µstrain/°F
CO2 Footprint   3.67 - 4.06 kg/kg   3.67 - 4.06 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