1. Overview of G11 Epoxy Laminate G11 epoxy laminate sheet is manufactured from woven fiberglass cloth and high-tem...
G11 epoxy laminate sheet is manufactured from woven fiberglass cloth and high-temperature epoxy resin, laminated under high heat and pressure.
It belongs to NEMA G11 insulation grade and is widely used in generators due to its:
H-class thermal resistance (180–200°C)
High mechanical strength at both room and elevated temperatures
Excellent dielectric properties
Low moisture absorption and dimensional stability
These characteristics make G11 an ideal material for generator slot wedges and slot insulation systems.
In a generator stator, slot wedges secure the coils inside the slots and resist electromagnetic forces during operation.
Why G11 is preferred for slot wedges:
Does not soften or deform at high temperatures
High bending and compressive strength
Superior dielectric strength ensures insulation reliability
Moisture-resistant and chemically stable
Long-term dimensional stability and long service life
G11 is also used for:
Slot bottom liners
Slot side insulation shims
Coil support components
End winding support insulation parts
Its strength and thermal resistance make it suitable for high-performance generator insulation systems.
| Generator Class | Recommended Material |
|---|---|
| F-class (155°C) | G10 / FR4 or G11 |
| H-class (180°C) | G11 strongly recommended |
| VFD-driven, wind power, high-temperature machines | G11 required |
Common thickness: 0.8–6 mm
Heavy-duty structural parts: 8–12 mm
Width: 10–80 mm
Length: 500–2000 mm (Typical: 1000 mm)
Tolerances:
Thickness: ±0.05–0.10 mm
Width: ±0.10 mm
Length: ±1 mm
Straightness: ≤0.3 mm/m
| Type | Features | Applications |
|---|---|---|
| Straight Wedge | Simple, economical | Standard generators |
| Dovetail Wedge | Excellent locking force | Hydro & turbo generators |
| Spring Wedge | Vibration-resistant | VFD motors, wind turbines |
| Split Wedge | Easy assembly | Large generators |
| Reinforced Wedge | Higher mechanical strength | Heavy-duty machines |
| Surface | Benefits |
|---|---|
| Smooth surface | Standard use |
| Roughened surface | Anti-slip, anti-loosening |
| Sanded/matte finish | Better friction, easier fit |
| Chamfering | Smooth insertion, avoids insulation damage |
| Moisture-proof coating | For damp environments |
| Insulation coating | Higher dielectric strength |
| Property | G10 / FR4 | G11 | Result |
|---|---|---|---|
| Thermal class | 120–155°C | 180–200°C | G11 superior |
| High-temp strength | Medium | High | Not prone to softening |
| Electrical insulation | Good | Excellent | Safer for HV coils |
| Dimensional stability | Medium | High | Ideal for long-term load |
| Service life | Standard | Long | More reliable |
G11 is widely used in modern wind power, hydro, nuclear, and turbo-generator stators.
Steam-turbine generators
Hydro generators
Wind turbine generators (DFIG, PMG)
Nuclear power generators
High-voltage synchronous motors
VFD motors and industrial generators
Xujue Electrical is a professional manufacturer of electrical insulation materials, which can customize various motor insulation slot wedges according to customer provided drawings. If you need to learn more about G11 epoxy board product information and quotations, please contact us.
If you are interested in our products,, please send us a message and we will contact you as soon as we receive it. Email: info@ztaero.com whatsApp: +8616650273778
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