Brand: YILONG
Materials: Silicone Resin + Glassfiber Cloth
Color: White
ID: 10-200mm
Length: 1000mm
Temperature Index: 220
Thermal Class: C
Flammability: V-0
Packaging: Pallet, Wooden Box
Description
G-7 is a high-performance glass-cloth reinforced silicone laminate with a natural cream-to-white color. It is made by impregnating continuous woven glass cloth with thermosetting silicone resin, providing excellent heat and arc resistance. G-7 maintains good electrical insulation even under humid conditions and performs reliably at high temperatures up to 220 °C (392 °F). While silicone may be less strong than epoxies at low temperatures, it retains superior mechanical strength after prolonged exposure above 450 °F (232℃)
Features
Excellent heat and arc resistance
High-temperature performance up to 220 °C
Low dielectric loss in dry conditions
Maintains good electrical insulation properties in humid or wet environments
Dimensionally stable and machinable with care
Cream-to-white natural color
Superior long-term strength at elevated temperatures
Applications
High-temperature electrical insulation components
Motor and generator insulation parts
Circuit board supports, switch mounts, and terminal blocks
Arc barriers in electrical equipment
Switchgear panels and electrical assemblies exposed to high heat
High-performance insulation in electronics and industrial devices
Technical Data Sheet
| Test / Property | Unit | G-3 | G-5/G9 | G-7 | G-10 | G-11 | G-11H |
| PHYSICAL | |||||||
| Density | g/cm³ | 1.8 | 1.85 | 1.8 | 1.8 | 1.8 | 1.9 |
| Water Absorption, 24 hrs | % | 2.65 | 0.6 | 0.1 | 0.1 | 0.2 | 0.2 |
| MECHANICAL | |||||||
| Tensile Strength – lengthwise | MPa | 289 | 425 | 138 | 310 | 296 | 280 |
| Tensile Strength – crosswise | MPa | 234 | 352 | - | 262 | 255 | 250 |
| Flexural Strength – lengthwise | MPa | 279 | 425 | 207 | 517 | 552 | 372 |
| Flexural Strength – crosswise | MPa | 234 | 352 | - | 448 | 483 | 124 |
| Flexural Modulus – lengthwise | GPa | 12.4 | 13.8 | 11 | 18.6 | 20.7 | 14 |
| Flexural Modulus – crosswise | GPa | 9.7 | 11.7 | - | 16.6 | 18.6 | 12 |
| Izod Notched Impact – lengthwise | kJ/m² | 0.64 | 0.67 | 0.64 | 0.71 | 0.61 | 16 |
| Izod Notched Impact – crosswise | kJ/m² | 0.59 | 0.45 | - | 0.61 | 0.46 | 14 |
| Compressive Strength | MPa | 379 | 448 | 345 | 448 | 434 | 346 |
| Hardness, Rockwell M | — | 110 | 115 | 105 | 110 | 112 | 112 |
| THERMAL | |||||||
| Coefficient of Linear Thermal Expansion – lengthwise | 10⁻⁶ / °C | 1.46 | 1.27 | 1.15 | 0.88 | 1.15 | 15 |
| Coefficient of Linear Thermal Expansion – crosswise | 10⁻⁶ / °C | 1.76 | 1.45 | 1.38 | 0.88 | 1.27 | 20 |
| Max Operating Temperature | °C | 180 | 140 | 220 | 140 | 165 | 180 |
| Thermal Class | / | H | B | C | B | F | H |
| Flammability Rating | UL94 | HB | V-0 | V-0 | HB | HB | HB |
| Thermal Conductivity | W/m·K | 0.29 | 0.29 | 0.29 | 0.29 | 0.29 | 0.25 |
| ELECTRICAL | |||||||
| Dielectric Strength (short time, 1/8" thick) | kV/mm | 18.1 | 11.8 | 13.8 | 31.5 | 35.4 | 16 |
| Dielectric Constant at 1 MHz | — | 7.3 | 6.3 | 4.5 | 5 | 4.5 | 4.8 |
| Dissipation Factor at 1 MHz | — | 0.023 | 0.019 | 0.018 | 0.019 | 0.02 | 0.02 |
| Arc Resistance | s | 180 | 180 | 240 | 100 | 120 | 120 |
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