G11 and FR5 are high-temperature glass-fabric epoxy composites offering superior mechanical, electrical, and thermal performance. G11 is the standard grade; FR5 is the flame-retardant version (UL 94 V-0).

How does G11 / FR5 differ from G10 / FR4?

G11 / FR5 offers higher continuous operating temperature (Class H – 180 °C), superior mechanical strength at elevated temperatures, and better dielectric stability. G10 / FR4 is Class F (155 °C) and preferred for general insulation; G11 / FR5 is selected where thermal load or endurance is critical.

What are the main applications?

Common uses include switchboards, transformers, bus bar supports, phase barriers, traction and rail systems, aerospace components, and defence assemblies operating under high heat or electrical stress.

Can G11 / FR5 be machined?

Yes. MISCO’ s CNC facility machines G11 / FR5 using carbide or diamond tooling with air cooling and dust extraction, achieving high precision and clean finishes.

How does it perform in humid or tropical conditions?

G11 / FR5 maintains excellent dielectric and mechanical strength in high humidity, outperforming many phenolic and polyester-based materials.

How should G11 / FR5 be stored?

Store flat, dry, and away from direct sunlight. Maintain below 30 °C and protect edges from damage. Acclimatise before machining.

Yes. MISCO’ s FR5 formulation is halogen-free and UL 94 V-0 certified, ensuring reduced smoke and toxicity.

Why choose MISCO Australia for G11 / FR5?

MISCO combines local stock, CNC fabrication, compliance traceability, and industry expertise, delivering high-quality insulation materials trusted across Australia’s defence, power, and industrial sectors.

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G11/FR5 Epoxy Glass

G11 / FR5 Epoxy Glass is a high-temperature, glass-reinforced epoxy material developed for electrical and mechanical applications operating under sustained thermal, electrical, and mechanical stress.

Produced from woven glass fabric bonded with a high-performance epoxy resin system, G11 / FR5 delivers a balanced combination of electrical insulation, structural strength, and thermal endurance. It is specifically selected where standard epoxy glass grades are no longer sufficient, particularly in environments involving elevated operating temperatures, continuous electrical loading, or mechanical stress over long service periods.

The material exhibits excellent dimensional stability, low moisture absorption, and strong resistance to oils, greases, and common industrial chemicals. These characteristics make it well suited to enclosed electrical assemblies and industrial environments where consistency and reliability are essential.

SPECIFICATIONS

Product Form

Sheets, rods, tubes, machined components, and custom profiles

Standard Colours

Natural yellow-green (G11) or pale green (FR5)

Sheet Sizes

1020 x 1220 mm (others available)

Thickness Range

0.8 mm to 60 mm – Larger thickness are to order

Compliance

AS/NZS 60893.3.2:2004 – Epoxy glass laminates (IEC 60893 EPGC204).
AS/NZS 3100:2017 – Electrical equipment requirements.
AS/NZS 61439 / 3439 – Switchgear and controlgear assemblies.
AS/NZS 4024.1:2019 – Machinery safety design principles.
ISO 9001 / ISO 14001 – Quality and Environmental Management (supplier certified).
DEF(AUST) 5000 – Defence Capability Systems alignment.
DISP-aligned – Suitable for Defence manufacturing environments.
DCoC available – Defence Certificate of Conformance on request.
MIL-I-24768/3 & /28 – G11 and FR5 military specifications.
UL 94 V-0 – Flame-retardant rating (FR5).
RoHS 3 / REACH – Fully compliant, SVHC-free.
Asbestos & halogen-free – Optional grades.
Non-hazardous / non-dangerous – WHS and EPA compliant.
Suitable for defence, aerospace, rail, and electrical industries

MECHANICAL PROPERTIES

ELECTRICAL PROPERTIES

THERMAL PROPERTIES

High mechanical strength at elevated temperatures.
Excellent dielectric insulation and electrical reliability.
Flame-retardant (FR5) – UL 94 V-0 rated.
Heat-resistant – continuous use up to 180 °C (Class H).
Dimensional stability under thermal and electrical load.
Low moisture absorption – maintains insulation in humid conditions.
Machinable to tight tolerances for precision components.
Chemical and solvent resistant – epoxy matrix offers superior durability.
Available in sheets, rods, tubes, and custom machined parts.
Halogen- and asbestos-free; RoHS 3 and REACH compliant.
Suitable for switchboards, transformers, motors, and defence systems.

Switchboards & Control Panels – Barriers, supports, busbar insulation plates.
Transformers & Reactors – Coil spacers, wedges, top/bottom boards.
Motors & Generators – Slot wedges, end rings, support blocks.
Power Distribution – Busbar supports, high-voltage barriers, arc plates.
Aerospace & Defence – Structural insulation, flame-resistant electrical panels.
Rail & Transport – Insulating brackets, switchgear panels, mounting plates.
Industrial Equipment – Fixtures, jigs, and thermal isolation components.
Renewable Energy Systems – Electrical insulation in turbines and converters.
Machined Components – Custom parts requiring high electrical and thermal performance.

Switchboard Builders – Insulating panels, busbar supports, and phase barriers.
Transformer Manufacturers – Spacers, coil formers, wedges, and terminal supports.
Motor Rewinders & Repairers – Slot wedges, end plates, and insulation blocks.
Electrical & Electronics – Circuit insulation, component housings, and mounting panels.
Power Generation & Distribution – HV/LV insulation components, arc shields, and busbar systems.
Renewable Energy – Turbine control panels, inverter insulation, and solar switchgear.
Rail & Transport – Rolling stock insulation, traction motor barriers, and switchgear covers.
Aerospace & Defence – Lightweight flame-retardant insulation and high-performance electrical panels.
Industrial Machinery – Structural insulators, spacers, and precision machined parts.
Oil, Gas & Energy – High-temperature, chemical-resistant insulation for harsh environments.
Construction & Infrastructure – Electrical protection panels, isolation barriers, and switch housings.
Mining & Heavy Industry – Durable insulation for control systems and power distribution.
HVAC & Utilities – Control board panels and electrical isolation parts.
Automation & Robotics – High-dielectric components for motion systems and enclosures.
Marine & Offshore – Moisture-resistant insulation for generators and switchboards.
Testing & Calibration Equipment – Electrically stable substrates and non-conductive fixtures.

High Performance: Maintains mechanical and electrical strength at elevated temperatures.
Thermal Stability: Continuous operating temperature up to 180 °C (Class H).
Electrical Reliability: Excellent dielectric strength and low loss under high voltage.
Dimensional Accuracy: Minimal warping or creep under load; ideal for precision-machined parts.
Chemical Resistance: Withstands oils, coolants, and most industrial solvents.
Moisture Resistance: Low water absorption ensures stable insulation in humid conditions.
Flame Retardant (FR5): UL 94 V-0 rated for enhanced fire safety.
Long Service Life: Inert, corrosion-resistant, and mechanically durable composite.
Machinability: Easily fabricated into complex shapes without loss of integrity.
Compliance: Meets IEC 60893, NEMA G11/FR5, and MIL-I-24768 standards; RoHS 3 and REACH compliant.
Environmentally Stable: Non-toxic, asbestos-free, and halogen-free options available.
Versatile Use: Suitable for electrical, industrial, rail, defence, and renewable applications.

Downloads

All supporting documents for this material are available for download, including the latest technical data sheet, safety data sheet, machining and processing guidance, compliance information, and relevant product brochures.

These controlled documents provide specifications, performance data, handling requirements, and application notes to assist with design, material selection, and fabrication.

Each file is maintained by MISCO Australia to ensure current, reliable information for switchboard, transformer, industrial, and defence grade applications.

Frequently Asked Questions

Discover the MISCO Australia Advantage

Experience the confidence of partnering with an Australian-owned manufacturer committed to quality, precision, and reliability. MISCO Australia combines hands-on expertise, advanced CNC machining, and decades of industry knowledge to deliver high-performance insulation materials and engineered components that meet the toughest electrical and mechanical demands.