G-5 and G-9 glass melamine laminates are composite materials made from continuous filament glass cloth impregnated with a heat-resistant melamine resin binder. These laminates are hard, flame-resistant, and possess excellent electrical insulating properties even under wet or humid conditions. G-5: An older designation largely replaced by G-9. It may still appear in older drawings or documentation but is fully interchangeable with G-9. G-9: The modern standard, offering superior flame and arc resistance, mechanical strength, and dimensional stability.
YILONG
Melamine Resin + Glassfiber Cloth
White
8-500mm
1000mm
130
B
V-0
Pallet, Wooden Box
High mechanical strength and structural integrity
Excellent electrical insulation with strong dielectric properties
Heat resistant, stable from -40°C to 130°C
Chemical, corrosion, and oxidation resistant
Long-lasting durability in industrial environments
● Electrical insulation in transformers, motors, and electrical connectors
● Structural components in industrial machinery
● Applications requiring high-strength, heat- and chemical-resistant insulation
● Environments exposed to mechanical stress, heat, and industrial chemicals
| Test / Property | Unit | G-5/G9 |
| PHYSICAL | ||
| Density | g/cm³ | 1.85 |
| Water Absorption, 24 hrs | % | 0.6 |
| MECHANICAL | ||
| Tensile Strength – lengthwise | MPa | 425 |
| Tensile Strength – crosswise | MPa | 352 |
| Flexural Strength – lengthwise | MPa | 425 |
| Flexural Strength – crosswise | MPa | 352 |
| Flexural Modulus – lengthwise | GPa | 13.8 |
| Flexural Modulus – crosswise | GPa | 11.7 |
| Izod Notched Impact – lengthwise | kJ/m² | 0.67 |
| Izod Notched Impact – crosswise | kJ/m² | 0.45 |
| Compressive Strength | MPa | 448 |
| Hardness, Rockwell M | — | 115 |
| THERMAL | ||
| Coefficient of Linear Thermal Expansion – lengthwise | 10⁻⁶ / °C | 1.27 |
| Coefficient of Linear Thermal Expansion – crosswise | 10⁻⁶ / °C | 1.45 |
| Max Operating Temperature | °C | 140 |
| Thermal Class | / | B |
| Flammability Rating | UL94 | V-0 |
| Thermal Conductivity | W/m·K | 0.29 |
| ELECTRICAL | ||
| Dielectric Strength (short time, 1/8" thick) | kV/mm | 11.8 |
| Dielectric Constant at 1 MHz | — | 6.3 |
| Dissipation Factor at 1 MHz | — | 0.019 |
| Arc Resistance | s | 180 |
Yes, based on drawings or samples.
UL, RoHS, REACH, CE, ISO, etc.
Usually 100 kg or 100 sheets, negotiable.
Yes, common samples free, buyer pays freight.
2-4 weeks after payment.
Yes, including labeling and packaging.
Yes, over 20 years.
T/T 30% deposit, 70% before shipment. Negotiable if supports needed.
Yes, we offer CNC machining.
Manufacturer and Exporter
No.3, Mianzhi Street, Zhucheng, Shandong, China
Copyright © 2025 by Qingdao Yilong Insulation Material Company Limited All Rights Reserved
