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Glass Polyester Characteristics
Glass polyester is a glass-mat reinforced polyester suitable for many applications. We offer it in three styles.
GPO-1 is a cost-effective, general purpose laminate. It is a solid choice for applications in which good electrical properties, good physical strength and moderate heat resistance are required.
GPO-2 is the laminate of choice when arc- or flame-resistance is required. It has good electrical and physical properties and heat resistance.
GPO-3 is the laminate to choose when arc, flame and carbon track-resistance are needed. GPO-3 offers good physical strength and moderate heat resistance. It is used extensively in the making of electrical components.
Characteristics of glass polyesters include:
- Economical general purpose laminate (GPO-1)
- Good electrical properties (GPO-1, 2 & 3)
- Excellent structural properties (GPO-1, 2 & 3)
- Flame-resistant (GPO-2 & 3)
- UL-recognized laminate GPO-2 & 3)
- Arc- and track-resistant (GPO-3)
See the chart below for more details on glass polyester properties.
Applications for Glass Polyester Thermosets
- High amperage mounting panels (GPO-2)
- Switch bases (GPO-2)
- Terminal strips (GPO-2)
- Arc shoot components (GPO-2)
- Phase and end barriers (GPO-3)
- Insulating and bus bar supports (GPO-3)
- Mounting panels in switchgear and other types of electrical apparatus (GPO-3)
Glass Polyester Material Properties
Dielectric Manufacturing, Richfield, Wisconsin USA dielectricmfg.com Glass Polyester Material Properties Provided By Dielectric Manufacturing, Richfield, Wisconsin
Property Metric units English units
General Density 1.7e3 - 2.5e3 kg/m^3 USD/kg 0.0614 - 0.0903 lb/in^3 USD/lb
Mechanical Yield Strength 3.66e7 - 4.04e7 Pa 5.3 - 5.86 ksi
Tensile Strength 2.5e7 - 5.5e7 Pa 3.63 - 7.98 ksi
Hardness (Vickers) 1.35e8 - 1.49e8 Pa 13.8 - 15.2 HV
Impact Strength (notched) 4e3 - 3e4 J/m^2 1.9 - 14.3 ft.lbf/in^2
Fracture Toughness 1.41e6 - 2.69e6 Pa/m^0.5 1.28 - 2.45 ksi/in^0.5
Young's Modulus 9e9 - 1.44e10 Pa 1.31 - 2.09 10^6 psi
Thermal Max Service Temperature 151 - 168 °C 304 - 334 °F
Insulator or Conductor Insulator Insulator Specific Heat Capability 1.09e3 - 1.42e3 J/kg °C 0.26 - 0.34 BTU/lb. °F
Thermal Expansion Coefficient 2.00E-05 strain/°C 11.1 µstrain/°F
Eco CO2 Footprint 7.59 - 8.38 kg/kg 7.59 - 8.38 lb/lb
Recyclable No No
Dielectric Manufacturing, Richfield, Wisconsin USA dielectricmfg.com
Glass Polyester Material Properties Provided By Dielectric Manufacturing, Richfield, Wisconsin