Glass Epoxy (G10, FR4) 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.
Epoxy resins are a good choice of thermosets for fabricated components for many electrical and mechanical applications.
FR4 is the fire-retardant grade of G10.
These materials offer:
- Good dimensional stability
- Outstanding insulating and electrical properties
- Moisture-resistance
- Excellent flammability rating
- UL listed
See the charts below for G-10 and FR4 material properties.
Applications for G10, FR4 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 sales@dielectricmfg.com.
G10 Glass Epoxy Material Properties
| Properties | |||
|---|---|---|---|
| Tensile Strength | 40,000 psi lengthwise | 35,000 psi crosswise | |
| Comprehensive Strength | 68,000 psi flatwise | 35,000 psi edgewise | |
| Flexural Strength - .125" | 55,000 psi lengthwise | 45,000 psi crosswise | |
| Modulus of Elasticity - Flexural | 2,700 psi lengthwise | 2,200 psi crosswise | |
| IZOD Impact | 7.0 ft-lb/in of notch lengthwise | 5.5 ft-lb/in of notch crosswise | |
| Rockwell Hardness M scale | 111 | ||
| Specific Gravity | 1.80 | ||
| Bond Strength, in lbs. | 2,000 | ||
| Coefficient of Thermal Expansion cm/cm- ºCx10-5 | 0.9 | ||
| Water Absorption | 0.62" thick % per 24 hrs = 0.25 | 0.125" thick % per 24 hrs = 0.15 | 0.500" thick % per 24 hrs = 0.10 |
| Dielectric Strength, volt/mil perpendicular to laminations: Step by Step | 0.62" thick = 450 | 0.125" thick = 350 | |
| Dissipation Factor, condition A, 1 megacycle max | 0.025 | ||
| Dielectric Constant condition A, 1 megacycle max | 5.2 | ||
| Insulation Resistance, Megaohms at Condition C | 200,000 | ||
| Temp. Index 0.62" and over | Electrical - ºC = 130 | Mechanical - ºC = 140 | |
| Mil-1-24768 | 2 | ||
| MIL - Type | GEE |
FR4 Glass Epoxy Material Properties
| Properties | |||
|---|---|---|---|
| Tensile Strength | 40,000 psi lengthwise | 35,000 psi crosswise | |
| Comprehensive Strength | 60,000 psi flatwise | 35,000 psi edgewise | |
| Flexural Strength - .125" | 55,000 psi lengthwise | 45,000 psi crosswise | |
| Modulus of Elasticity - Flexural | 2,700 psi lengthwise | 2,200 psi crosswise | |
| IZOD Impact | 7.0 ft-lb/in of notch lengthwise | 5.5 ft-lb/in of notch crosswise | |
| Rockwell Hardness M scale | 110 | ||
| Specific Gravity | 1.85 | ||
| Bond Strength, in lbs. | 2,000 | ||
| Coefficient of Thermal Expansion cm/cm- ºCx10-5 | 1.0 | ||
| Water Absorption | 0.62" thick % per 24 hrs = 0.25 | 0.125" thick % per 24 hrs = 0.15 | 0.500" thick % per 24 hrs = 0.10 |
| Dielectric Strength, volt/mil perpendicular to laminations: Step by Step | 0.62" thick = 450 | 0.125" thick = 350 | |
| Dissipation Factor, condition A, 1 megacycle max | 0.025 | ||
| Dielectric Constant condition A, 1 megacycle max | 5.2 | ||
| Insulation Resistance, Megaohms at Condition C | 200,000 | ||
| Temp. Index 0.62" and over | Electrical - ºC = 130 | Mechanical - ºC = 140 | |
| Mil-1-24768 | 27 | ||
| MIL - Type | GEE-F |
