FR-4 and G-10 are the most versatile all-around of the laminate grades and are made by impregnating an epoxy resin binder into continuous glass woven fabric. G10/FR4 has extremely high mechanical strength, good dielectric loss properties, and good electric strength properties, both wet and dry. G10/FR4 are widely used in the electronics field – primarily because water absorption is virtually nil, rendering it an excellent insulator.
The difference between G10 and FR4 is that FR4 is a fire-retardant grade of G10. FR4 can be safely substituted when G10 is called out, while G10 can never be substituted where FR4 is called for.
Color: yellowish to light green
G10 specifies to MIL-I-24768/2 (GEE), MIL-P-18177 GEE and LP-509)
FR4 specifies to MIL-I-24768/27 (GEE-F) and MIL-P-18177 GEE-F
| Mechanical | ASTM Test Method | Value | Units |
|---|---|---|---|
| Strength to Weight Ratio | - | - | ksi |
| Specific Gravity @73 F | D792 | 1.82 | - |
| Tensile Strength @73 F, (ult)/(yld) | D638 | 40,000 | psi |
| Tensile Modulus of Elasticity @73 F | D638 | - | psi |
| Tensile Elongation at Break @73 F | D638 | - | % |
| Flexural Strength @73 F | D790 | 55,000 | psi |
| Flexural Modulus of Elasticity @73 F | D790 | 2,700,000 | psi |
| Shear Strength @73 F | D732 | 19,000 | psi |
| Comprehensive Strength, (% Deformation) @73 F | D695 | 60,000 (10) | psi |
| Comprehensive Modulus of Elasticity @73 F | D695 | - | psi |
| Hardness, Rockwell, Scale as noted @73 F | D785 | M110 | - |
| Hardness, Durometer, Shore D @73 F | D2240 | - | - |
| Izod Impact, (Notched) @73 F | D256 Type A | 7.0 | ft-lb/in of notch |
| Coefficient of Friction, (Dry vs Steel) Dynamic | - | - | - |
| Limiting PV, (with 4 to 1 factor of safety applied) | - | - | psi-ft/min |
| Thermal | ASTM Test Method | Value | Units |
|---|---|---|---|
| Coefficient of Linear Thermal Expansion @73 F | E-831 (TMA) | - | in/in/F |
| Heat Deflection Temperature @264 psi | D648 | - | F |
| Tg-Glass transition termperature, (Amorphous) | D3418 | - | F |
| Melting Point, (VS=Vicat Softening Temp.) | D3418 | - | F |
| Continuous Service Temperature in Air, (Max.) | - | 285 | F |
| Thermal Conductivity | - | - | BTU-in/hr-ft2-F |
| Electric | ASTM Test Method | Value | Units |
|---|---|---|---|
| Dielectric Strength, Short Term | D149 | 400 | Volts/mil |
| Volume Resistivity | D257 | - | ohm-cm |
| Dielectric Constant @10E6 Hz | D150 | 5.2 | - |
| Dissipation Factor @10E6 Hz | D150 | 0.025 | - |
| Flammability @3.1 mm unless noted | UL94 | V-0 | - |
| H2O | ASTM Test Method | Value | Units |
|---|---|---|---|
| Water Absorption, Immersion, 24 hours | D570(7) | 0.10 | % by weight |
| Water Absorption, Saturation | D570(7) | - | % by weight |