Glass-Silicone (G-7) Characteristics
G-7, a glass-silicone laminate, has excellent dielectric loss properties under dry conditions and good electrical properties under humid conditions. It also has excellent heat and arc resistance and is self-extinguishing. It is often used for electrical grade insulation as well as heating and appliance insulation.
While silicones do not retain their strength as well as epoxies and phenolics over time under lower temperatures, they are stronger over time under high heat conditions (over 400 degrees F).
- Outstanding electrical properties
- Excellent heat and arc resistance
- Self-extinguishing
- UL 94V-O Flame class rating
Applications for G-7 Thermosets
- Electrical grade insulation
- Heating and appliance insulation
- Shoulder bushings
- Lock bolt washers
- Arm insulating plates
- Bus tube standoffs
| Property | Typical value | units | |
|---|---|---|---|
| Physical | |||
| Specific Gravity/Density | 1.75 | g/cm3 | |
| Water Absorption -.125" | < .35 | % | |
| Temperature Index | 220 \ 428 | °C \ °F | |
| Hardness (Rockwell) | 100 | M scale | |
| Bond Strength | > 700 \ 320 | lbs \ kgs | |
| Flexural Strength-LW-A-.125" | > 25000 \ 173 | PSI \ MPa | |
| Flexural Strength-CW-A-.125" | > 22000 \ 152 | PSI \ MPa | |
| Izod Impact Strength-LW | > 10 | ft-lbs/in | |
| Izod Impact Strength-CW | > 8 | ft-lbs/in | |
| Compressive Strength-Flatwise | > 47000 \ 324 | PSI \ MPa | |
| Electrical | |||
| Dielectric Breakdown-A | > 50 | kV | |
| Dielectric Breakdown-D48/50 | > 30 | kV | |
| Permittivity-A | < 4.0 | ||
| Arc Resistance-A | 180 | SEC | |
| Dissipation Factor-A | 0.003 | ||
| Dissipation Factor-D24/23 | 0.02 |
