G10 and FR4 are glass fabric–reinforced epoxy composites known for exceptional mechanical, electrical, and thermal performance. The materials are produced by impregnating woven glass cloth with epoxy resin and curing under heat and pressure. • G10: Standard grade with high mechanical and dielectric strength. • FR4: Flame-retardant version meeting UL 94 V-0 requirements.

What is the difference between G10 and FR4?

Both share identical mechanical and electrical performance; the key difference is flame retardant. • G10: Non-flame-retardant, suitable for dry or sealed environments. • FR4: Flame-retardant (UL 94 V-0), suitable for switchboards and industrial electrical systems requiring fire safety compliance.

What industries use G10 / FR4?

Used across electrical, electronic, and industrial sectors, including: Switchboard Building • Transformer Manufacturing • Power Generation • Rail & Transport • Aerospace • Defence • Renewable Energy • Industrial Machinery • Marine • Automotive

How does G10 / FR4 perform at cryogenic temperatures?

It maintains structural strength and insulation down to -196 °C, making it suitable for cryogenic and aerospace applications.

Is G10 / FR4 suitable for outdoor use?

Moderate UV resistance, but long-term outdoor exposure may cause surface yellowing. Protective coating or enclosure is advised for permanent external installations.

What PPE should be used when machining?

Use dust masks (P2 or N95), gloves, safety glasses, and extraction systems to prevent inhalation or skin irritation from fine glass dust.

Why source from MISCO Australia?

MISCO offers Australian-held stock, precision machining, and verified compliance to global standards, delivering dependable insulation materials with full documentation and responsive technical support.

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G10 /FR4 EPOXY GLASS

G10 / FR4 Epoxy Glass is a high-strength, woven fibreglass epoxy composite designed for demanding electrical and mechanical applications. It provides exceptional structural rigidity, high dielectric strength, low moisture absorption, and stable performance across a wide temperature range, making it one of the most trusted insulation materials in modern industry.

FR4 incorporates a flame-retardant epoxy system (typically UL 94 V-0), delivering enhanced fire safety for switchboards, transformers, motors, inverters, and other high-reliability electrical assemblies. Its uniform glass-cloth reinforcement ensures consistent mechanical strength in all directions, supporting precision CNC machining with clean edges, minimal tool wear, and excellent dimensional stability.

With proven long-term performance in harsh, high-energy environments, G10 / FR4 withstands heat, load, vibration, humidity, and chemical exposure without loss of structural or electrical integrity.

SPECIFICATIONS

Product Form

Sheets, Rods, Tubes and Precision-Machined Parts and Blanks.

Standard Colours

Natural Green, Light Yellow, and Custom Colours on Request

Sheet Sizes

1020 x 1220 mm (others available)

Thickness Range

0.5 mm to 100 mm – Larger thickness are to order

Compliance

NEMA Grade: G10 / FR4 (ANSI/NEMA FR-4
Complies with MIL-I-24768/2 (G10) and MIL-I-24768/27 (FR4)
Class: E (IEC 60085) – Electrical Insulating Rigid Material
RoHS and REACH Compliant
Meets IEC 61249-2-21 halogen-free requirements
Manufactured to: ISO 9001:2015 Quality Management System
UL File: E344098 (Generic G10 epoxy glass system listing)

MECHANICAL PROPERTIES

ELECTRICAL PROPERTIES

THERMAL PROPERTIES

High Dielectric Strength
Reliable insulation performance for switchboards, transformers, motors, and high-voltage systems.
Exceptional Mechanical Rigidity
Strong, stiff, and dimensionally stable under load, vibration, and mechanical stress.
Flame-Retardant System (FR4)
Typically meets UL 94 V-0, delivering enhanced fire safety for electrical assemblies.
Low Moisture Absorption
Maintains electrical and mechanical integrity in humid, outdoor, or condensation-prone environments.
Excellent Machinability
Clean, accurate CNC machining with minimal tool wear, ideal for complex profiles and tight tolerances.
Outstanding Dimensional Stability
Resists warping, swelling, and deformation across wide temperature and humidity changes.
High Chemical Resistance
Withstands oils, greases, fuels, lubricants, and many industrial solvents.
Wide Thermal Operating Range
Stable performance from sub-zero temperatures to typical continuous use at 130–140°C.
Uniform Glass-Reinforced Structure
Predictable performance in every direction due to consistent woven fibreglass reinforcement.
Halogen-Free Options Available
MISCO Australia’s FR4 is supplied halogen-free, RoHS and REACH compliant.
Long Service Life
Proven durability in mission-critical and high-energy environments.

Switchboard & Electrical Distribution
Insulation barriers, busbar supports, mounting panels, arc-containment components, terminal boards.
Transformer, Motor & Generator Manufacturing
Insulation spacers, coil supports, wedges, phase barriers, top/bottom press plates.
Power Systems & Energy Infrastructure
Inverter insulation panels, HV/LV isolation components, renewable energy enclosures.
CNC Machined Precision Components
Profiles, brackets, housings, custom parts requiring tight tolerances and dimensional stability.
Rail & Rolling Stock
High-strength insulating structures, electrical isolation parts, vibration-resistant components.
Aerospace, Defence & Military Systems
Lightweight structural insulation in avionics, control systems, and rugged equipment.
Industrial Machinery & Automation
Jigs, fixtures, wear components, mechanical isolation plates, and chemical-resistant housings.
Automotive, EV & Heavy Vehicle Manufacturing
Non-conductive components, thermal barriers, battery system insulation.
Mining, Metals & Harsh Industrial Environments
High-strength insulating components resistant to oils, vibration, and extreme duty cycles.
Data Centres & Critical Electrical Infrastructure
Isolation panels, support structures, and components for UPS, switching, and backup systems.

Switchboard Builders & Electrical Distribution
LV/HV switchboards, control panels, busbar systems, and arc-resistant assemblies.
Transformer, Motor & Generator Manufacturers
Coil insulation, structural supports, spacers, wedges, and custom machined components.
Aerospace, Defence & Military Systems
High-performance insulating and structural parts for avionics, communications, and rugged equipment.
Rail, Rolling Stock & Tunnel Infrastructure
Electrical isolation components, vibration-resistant parts, and safety-critical assemblies.
Industrial Machinery, Automation & Robotics
Fixtures, housings, jigs, guides, and precision insulating structures.
Renewable Energy & Power Generation
Wind turbine control systems, solar inverters, battery storage insulation, and turbine generator components.
Automotive, EV & Heavy Transport
Thermal and electrical barriers, battery insulation, and non-conductive mechanical parts.
Oil, Gas, Petrochemical & Refining
Chemical-resistant insulating components for harsh industrial and high-energy environments.
Mining, Metals, Foundries & Heavy Industry
High-strength insulating elements resistant to heat, load, and contamination.
Electronics, Semiconductor & High-Tech Manufacturing
Jigs, fixtures, precision plates, and structural insulation for production equipment.
HVAC, Heating & Thermal Control Systems
Non-conductive structural components for heating equipment and thermal assemblies.
Data Centres & Critical Infrastructure
Electrical isolation parts for UPS systems, switch gear, and high-reliability power equipment.

Reliable Electrical Performance
High dielectric strength ensures consistent insulation in low-voltage and high-voltage systems.
Long-Term Mechanical Stability
Maintains rigidity and structural integrity under load, vibration, and continuous operation.
Enhanced Fire Safety (FR4)
Flame-retardant system helps reduce ignition risk and improves safety in electrical assemblies.
Superior Moisture Resistance
Low water absorption prevents swelling, warping, and electrical degradation in humid environments.
Excellent CNC Machinability
Machines cleanly with precise tolerances—ideal for complex, high-accuracy components.
Chemical and Contamination Resistance
Resists oils, lubricants, fuels, greases, and many industrial chemicals.
Wide Operating Temperature Window
Performs reliably from sub-zero conditions up to typical thermal class limits.
Predictable, Uniform Properties
Woven fibreglass reinforcement delivers consistent behavior in all directions, reducing design variability.
Low Maintenance and Long Service Life
Durable, stable, and resistant to environmental ageing, lowering whole-of-life cost.
Compliant and Traceable Material Supply
Meets international electrical and mechanical standards, supplied with full batch traceability.

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

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