G-5 (GLASS CLOTH / MELAMINE RESIN)
Material Information
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-5 is made up of a mixture of melamine resin and glass cloth. G-5 is the hardest and most abrasion resistant industrial laminate, is arc and heat resistant, has excellent electrical properties under dry conditions, has high mechanical strength, and good dimensional stability. G-5 is less resistant to the elements of nature than G-9. G-5 is available in plate, rod, and tube.
G-5 meets MIL-I-24768/8 TYPE GMG
Application
- Switch board panels
- Arc barriers
- Circuit breaker parts
- Structural electrical parts
- Terminal blocks
Properties
- Excellent electrical properties under dry conditions
- Mechanical strength
- Good dimensional stability
- Arc resistant
- Flame and heat resistant
- Hard
Typical Properties of Glass Phenolics (Sheet Form) |
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Physical |
Astm Test Method |
G-5/G-9 |
G-7 |
G-10/FR-4 |
G-11 |
| Density (lb/in^3) | D792 | 0.067 | 0.065 | 0.065 | 0.065 |
| Specific Gravity | D792 | 1.85 | 1.8 | 1.8 | 1.8 |
| Water Absorption @ 24 hours (%) | D570 | 0.6 | 0.1 | 0.1 | 0.2 |
Mechanical |
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| 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 |
| Rockwell Hardness | D785 | M115 | M105 | M110 | M112 |
Thermal |
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| 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 |
| Flammability Rating | UL94 | VO | VO | VO | HB |
Electrical |
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| Dielectric Strength, Short Term, (Volts/Mil) @ .125″ Thick |
D149 | 300 | 350 | 800 | 900 |
| 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 |
NOTE:
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.