G11 / FR5 Fibreglass Epoxy Plate

High-Temperature Electrical Insulation & Structural Laminate Plate

G11 / FR5 Fibreglass Epoxy Plate is a high-performance glass-reinforced epoxy laminate engineered for elevated temperature service and electrical insulation applications. Manufactured from woven fibreglass cloth and a high-temperature epoxy resin system, this material maintains mechanical strength and dielectric stability under demanding thermal and electrical loads.

Because G11 and FR5 share similar base construction but differ in flame-retardant classification, they suit both structural and regulated electrical environments.

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Performance Characteristics

G11 / FR5 epoxy plates deliver:

• High mechanical strength
• Excellent dielectric properties
• Low moisture absorption
• Stable performance at elevated temperatures
• Strong dimensional stability under load

Because the material retains stiffness and insulation at higher operating temperatures than standard FR4, engineers frequently select it for heat-intensive applications.

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Typical Applications

Due to its thermal and electrical reliability, G11 / FR5 is widely used in:

• Electrical switchgear and busbar supports
• Transformer components
• Industrial insulation panels
• Wind energy electrical housings
• EV battery isolation structures
• Aerospace electrical brackets
• Defence-grade electrical assemblies
• High-temperature jigs and tooling

These industries rely on G11 / FR5 where both insulation integrity and structural performance must remain stable under load.

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Machining & Fabrication

G11 / FR5 fibreglass epoxy plate machines cleanly using carbide tooling. It supports:

• CNC routing
• Drilling and tapping
• Waterjet cutting
• Milling

However, proper dust extraction is recommended during machining due to glass fibre content.

Because the material bonds well with epoxy adhesives, it also integrates easily into composite assemblies.

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Available Formats

• Sheet sizes (standard and cut-to-size) 500×500 / 500×700 / 500×1000

• Multiple thickness options

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Why Choose Enhanced Composites

Enhanced Composites supplies industrial-grade G11 and FR5 laminates selected for electrical integrity, consistent thickness tolerance, and reliable performance in real operating environments. In addition, we understand the difference between structural composite plates and true electrical insulation laminates. That technical knowledge ensures you receive the correct grade for your application.

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FAQs

Is G11 better than FR4?
Yes, for high-temperature applications. G11 maintains strength and insulation properties at higher operating temperatures than standard FR4.

When should I choose FR5 instead of G11?
Choose FR5 when flame-retardant certification is required in addition to high thermal and electrical performance.

Thickness (mm)	1, 1.5, 2, 2.5, 3, 4, 5, 10
Size (mm)	500 x 500, 500 x 700, 500 x 1000