G-10/FR-4 (GLASS CLOTH / EPOXY RESIN)
Phenolics are thermoset resins formed by the polymerization of phenol and formaldehyde, which can then be impregnated with cotton canvas or linen, paper, or glass cloth materials to form industrial laminates. Overall, industrial laminates are dense, strong and durable, moisture resistant, lightweight, and will not soften when heat is reapplied. Typically they have high mechanical and insulating properties.
G-10 is made up of a mixture of epoxy resin and glass cloth. G-10 has extremely high mechanical strength and dimensional stability over temperature, low water absorption, and superior electrical properties when both wet and dry. These electrical properties make it the most widely used in the electrical field. G-10’s properties are exhibited over a wide range of temperatures and humidities. G-10 is stronger than the other glass-epoxy laminate G-11, but is not as good of an insulator and can’t handle quite as high of temperatures. Because of it’s strength, G-10 is difficult to machine and may require special equipment. G-10/FR-4 is available in sheet, rod, and tube.
FR-4 is a fire retardant grade of G-10.
G-10 Phenolic meets MIL-I-24768/2 TYPE GEE.
FR-4 Phenolic meets MIL-I-24768/27 TYPE GEE-F.
- Terminal boards
- Structural components
- Parts where size to weight ratio is critical
- Electrical test equipment
- Electric rotor insulation
- Circuit boards
- Dimensional stability
- Mechanical strength
- Good insulator
- Low water absorption
- Stable properties over wide range of temperatures and humidities
- Superior electrical properties in wet and dry conditions
- Fire retardant (FR-4)
Typical Properties of Glass Phenolics (Sheet Form)
Astm Test Method
|Water Absorption @ 24 hours (%)||D570||0.6||0.1||0.1||0.2|
|Tensile Strength (PSI) Lengthwise, Crosswise||D638||61,600 and 51,100||20,000 and -||45,000 and 38,000||43,000 and 37,000|
|Flexural Strength (PSI) Lengthwise, Crosswise||D790||61,600 and 51,100||30000 and -||75,000 and 65,000||80,000 and 70,000|
|Compressive Strength (PSI)||D695||65,000||50,000||65,000||63,000|
|Flexural Modulus (KPSI) Lengthwise, Crosswise||D790||2,000 and 1,700||1,600 and -||2,700 and 2,400||3,000 and 2,700|
|Izod Impact (Notched), ft-lb/in Lengthwise, Crosswise||D256||12.5 and 8.5||13.0 and -||14.0 and 12.0||12.0 and 9.0|
|Coefficient of Thermal Expansion,
10^-5/°F Lengthwise, Crosswise
|D696||.83 and 1.00||.72 and .90||.55 and .66||.72 and .83|
|Continous Service Temp (Operating), °F||-||285||430||284||329|
|Thermal Conductivity, BTU-in/hr-ft² °F||C177||2||2||2||2|
|Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
|Arc Resistance (sec)||D495||180||240||100||120|
|Dielectric Constant at 1 MHz||D150||6.3||4.5||5||4.5|
|Dissipation Factor at 1 MHz||D150||0.019||0.018||0.019||0.02|
The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.