Common Epoxy Sheet Specifications and Types: FR4, G10, G11 & 3240 Epoxy sheet

Epoxy sheets, also known as epoxy fiberglass laminates, are composite insulating materials manufactured by impregnati...

Epoxy sheets, also known as epoxy fiberglass laminates, are composite insulating materials manufactured by impregnating fiberglass cloth with epoxy resin, followed by drying and hot pressing. They feature excellent mechanical strength, dielectric properties, oil resistance, and solvent resistance, making them widely used in electronics, electrical equipment, machinery, and many other industrial sectors.

Understanding the common specifications and models of epoxy sheets is essential for selecting the right insulation material for different applications.

Common Specifications of Epoxy Sheets

1. Thickness Specifications

Epoxy sheets are available in a wide range of thicknesses. Common thickness specifications include:
Thickness:0.2mm/0.3mm/0.5mm/0.8mm/1.0mm/1.2mm/1.5mm/2.0mm/2.5mm/3.0mm/4.0mm/5.0mm
/6.0mm/8.0mm/10.0mm/15.0mm/20mm/50mm
Thin epoxy sheets, such as 0.2mm to 0.5mm, are commonly used in electronic components and compact electrical devices where strict thickness requirements exist and mechanical strength requirements are relatively low. Typical applications include insulation layers for small electronic circuit boards.
Epoxy sheets with thicknesses ranging from 1.0mm to 3.0mm are more widely used in electrical insulation structural parts, electrical equipment, and small mechanical components.
Thicker epoxy sheets of 4.0mm and above are generally used in applications requiring higher mechanical strength or superior insulation performance, such as support structures for large electrical equipment.

2. Standard Size Specifications

In terms of sheet dimensions, the most common standard sizes include:

Standard Size: 1020*1220 /1020*1020 /1220*2440 /1220*2040 mm(Support customize)

These standard sizes facilitate mass production and allow users to conveniently cut and process the material according to actual project requirements.
In special applications, custom dimensions can also be manufactured based on customer drawings or technical specifications. Smaller sheets are suitable for compact products, while larger sheets are ideal for large electrical equipment or assembled structures.

Common Models of Epoxy Sheets

Classification Basis

Epoxy sheet models are generally classified according to their performance characteristics, production processes, and intended applications. Different models vary in terms of:
Mechanical strength
Electrical insulation performance
Flame retardancy
Heat resistance
Chemical resistance
These differences allow epoxy sheets to meet the diverse requirements of various industrial applications.

Common Epoxy Sheet Models

FR4 Epoxy Sheet

FR4 is one of the most widely used epoxy laminate materials worldwide.
Main Features
Excellent electrical insulation performance
Good mechanical strength
Superior flame-retardant properties
Stable processing performance
Applications
FR4 epoxy sheets are extensively used in the electronics industry, especially in printed circuit board (PCB) manufacturing. Its high flame-retardant rating effectively reduces fire risks caused by electrical faults, ensuring the safe operation of electronic devices.
Additionally, FR4 provides sufficient mechanical strength to support and secure electronic components, maintaining circuit board stability under various operating conditions.

3240 Epoxy Sheet

3240 epoxy sheet is another commonly used insulation laminate material.
Main Features
High mechanical strength
Good electrical properties
Excellent oil resistance
Strong moisture resistance
Applications
3240 epoxy sheets are widely used in machinery manufacturing for producing mechanical parts, insulation supports, mold components, and electrical insulation structures.
Compared with some other epoxy sheet types, 3240 performs particularly well in oily or humid environments, making it suitable for industrial machinery applications.

G10 Epoxy Sheet

G10 epoxy sheet is known for its outstanding mechanical and electrical properties.
Main Features
High hardness
Excellent wear resistance
Strong dimensional stability
Superior insulation performance
Applications
G10 is commonly used in applications requiring high mechanical performance, including:
Aerospace components
Precision instruments
High-end electronic equipment
Industrial insulation structures
Its excellent strength-to-weight ratio makes it especially suitable for demanding engineering applications.

G11 Epoxy Sheet

G11 epoxy sheet is similar to G10 but offers enhanced high-temperature performance.
Main Features
Higher thermal resistance
Excellent electrical insulation
Superior mechanical stability at elevated temperatures
Applications
G11 epoxy sheets are widely used in high-temperature operating environments, such as:
High-temperature furnace insulation parts
Electrical insulation near aircraft engines
High-voltage equipment
Industrial heating systems
Its ability to maintain stable performance under elevated temperatures makes it ideal for harsh industrial environments.

How to Select the Right Epoxy Sheet

Different specifications and models of epoxy sheets offer unique performance advantages. When selecting an epoxy sheet, users should carefully evaluate the actual application requirements, including:
Mechanical stress levels
Electrical insulation requirements
Operating temperature range
Chemical resistance
Moisture and oil exposure
Flame-retardant requirements
Choosing the appropriate epoxy sheet specification and model helps ensure product reliability, operational safety, and long-term performance stability.

Reliable Epoxy Insulation Material Solutions

Manufacturer Consultation – Xujue Eelectrical
Xujue Eelectrical is a professional manufacturer specializing in high-performance electrical insulation materials.
The company mainly provides insulation material solutions for:
Transformers
Electric motors
Generators
New energy vehicles
Electronic communications
Aerospace applications
If you are searching for reliable electrical insulation materials, Xujue Electric’s experienced engineering team can provide professional recommendations based on your actual operating conditions and application scenarios.
In addition to standard insulation materials, customized machining and fabrication services are also available according to customer drawings and technical requirements.