In the electronic materials industry, epoxy sheets are widely recognized as essential insulation materials for electrical and electronic equipment. Among them, 3240 epoxy sheets and FR-4 fiberglass sheets are two commonly used grades. Although both belong to the epoxy board family, they differ significantly in composition, properties, and application areas.
YILONG INSULATION, a professional supplier of epoxy glass cloth laminated sheets, provides both 3240 Epoxy Boards and FR-4 fiberglass boards with consistent quality, competitive prices, and global delivery.
3240 Epoxy Board (EPGC201, IEC Standard)
3240 epoxy board is made from electrical glass cloth impregnated with epoxy resin, followed by drying and hot pressing. It is a Chinese national standard grade (GB/T 3240) and corresponds to EPGC201 in IEC standards. The material combines epoxy resin and glass cloth to deliver excellent electrical insulation and mechanical strength.
FR-4 Fiberglass Board (Flame Retardant Grade)
FR-4 is not a single material name, but a grade designation. It refers to epoxy resin laminates with flame-retardant properties, typically made from tetrafunctional epoxy resin + fiberglass cloth + fillers. FR-4 complies with the UL 94V-0 flame retardant standard, making it one of the most widely used insulation and PCB substrate materials worldwide.
Flame Retardant
3240: Non flame-retardant, may continue burning.
FR-4: Excellent flame resistance, UL 94V-0 certified, self-extinguishing.
Color and Appearance
3240: Yellowish, slightly shimmering, less uniform in appearance.
FR-4: Crystal-clear green or jade-like finish, high-end look.
Environmental Friendliness
3240: May contain halogens, less eco-friendly.
FR-4: Halogen-free options available, safe, eco-friendly, compliant with RoHS and REACH.
Dimensional Stability & Water Absorption
3240: Moderate dimensional stability, slightly higher water absorption.
FR-4: Excellent dimensional stability, precise thickness tolerance, low water absorption.
Electrical & Mechanical Properties
Both: High dielectric strength, good arc resistance, surface leakage resistance.
FR-4: Superior bending strength, impact resistance, suitable for applications under high mechanical stress.
3240 Epoxy Board Applications
Electrical equipment insulation parts
Mechanical structural insulation components
Transformer and motor insulation pieces (general grade)
Cost-effective choice for general electrical insulation needs
FR-4 Fiberglass Board Applications
PCB drilling pads and FPC reinforcement boards
High-performance motor insulation and transformer insulation
High-end electronics: televisions, monitors, copiers, audio systems
Flame-retardant insulation parts in industrial and consumer electronics
YILONG INSULATION specializes in epoxy glass cloth laminated sheets and related insulation materials. With over 15 years of experience in manufacturing and exporting:
Product Range: 3240 Epoxy Boards, FR-4 fiberglass sheets, G10/FR5/EPGC series laminates.
Quality Standards: IEC, UL, RoHS, REACH compliance.
Advantages: Stable supply, competitive pricing, customized cutting service.
Export Markets: Products delivered to more than 30 countries in Europe, North America, Latin America, and Asia.
By choosing YILONG INSULATION, customers gain access to high-quality epoxy insulation materials that meet diverse performance and cost requirements.
When comparing Epoxy Board 3240 vs FR-4, the choice depends on the application:
For general insulation and cost-effective solutions, 3240 epoxy sheets are sufficient.
For high-performance, flame-retardant, and environmentally friendly applications, FR-4 fiberglass sheets are the ideal option.
YILONG INSULATION provides both grades, ensuring reliable quality, professional service, and global delivery. Contact us for technical data sheets, samples, or customized solutions.
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