EPGC 204/FR5 Epoxy Glass Cloth Laminated Sheet is a high-performance electrical insulation material reinforced with electrical-grade alkali-free glass cloth and impregnated with a specially formulated epoxy resin. Manufactured through high-temperature and high-pressure lamination, it provides a combination of high mechanical strength, thermal resistance, electrical insulation and flame retardancy.
As a Class F insulation material, EPGC 204/FR5 is designed for applications where stable electrical and mechanical performance is required at elevated temperatures. Compared with standard FR4, it offers higher thermal performance and a higher glass transition temperature, making it suitable for demanding industrial, electrical and electronic applications.
What Is EPGC 204/FR5?
EPGC 204/FR5 is a glass cloth reinforced epoxy laminate manufactured by impregnating woven glass fabric with epoxy resin and consolidating the laminated layers under controlled heat and pressure.
The material is specified under NEMA FR5, MIL-I-24768/28 GEB and IEC 60893 EPGC204 standards, depending on the applicable product specification.
YILONG manufactures EPGC 204/FR5 for electrical insulation and industrial applications requiring high mechanical strength, stable performance at elevated temperatures and flame retardancy.
Class F Thermal Insulation
EPGC 204/FR5 belongs to Thermal Class F insulation and has a long-term temperature rating of 155°C according to the specified product requirements.
Its high-temperature mechanical performance makes it suitable for components that experience both mechanical loading and elevated operating temperatures.
High Glass Transition Temperature
One of the important characteristics of EPGC 204/FR5 is its high glass transition temperature.
YILONG's specified FR5 material has a Tg of approximately 185°C by DSC, providing a higher thermal margin than conventional FR4 materials.
The actual allowable operating temperature should always be determined according to the application, design conditions and applicable standard rather than based on Tg alone.
Key Properties of EPGC 204/FR5
EPGC 204/FR5 combines several properties that are important for electrical insulation and structural components.
High Temperature Resistance
The material provides long-term temperature resistance up to 155°C under the specified conditions and maintains stable mechanical performance at elevated temperatures.
Its high-temperature bending strength is particularly useful for components that need to retain structural integrity during operation.
High Mechanical Strength
The glass cloth reinforcement provides high mechanical strength and good dimensional stability.
EPGC 204/FR5 can therefore be used not only as an electrical insulating material but also as a structural material for supports, fixtures, spacers and machined components.
Flame Retardancy
EPGC 204/FR5 provides UL94 V-0 flame-retardant performance according to the specified product requirements.
This characteristic makes it suitable for electrical and electronic applications where flame retardancy is an important part of the material specification.
Low Moisture Absorption
Compared with conventional FR4, FR5 is generally specified with lower water absorption. This helps the material maintain more stable electrical and dimensional performance in applications where moisture resistance is important.
The actual water absorption value should be evaluated according to the relevant material standard and YILONG technical datasheet.
EPGC 204/FR5 vs. FR4
Although EPGC 204/FR5 and FR4 are both glass cloth reinforced epoxy laminates, they are designed for different performance requirements.
Higher Thermal Performance
FR5 provides a higher thermal performance level than standard FR4. YILONG's EPGC 204/FR5 is classified as Class F, 155°C, making it suitable for applications where standard FR4 may not provide sufficient thermal capability.
Higher Tg
With a specified Tg of approximately 185°C, EPGC 204/FR5 provides a higher glass transition temperature than typical standard FR4 grades.
High-Temperature Mechanical Stability
EPGC 204/FR5 is particularly suitable when mechanical strength must be maintained under elevated-temperature conditions.
For applications involving continuous heat, thermal cycling or mechanical loading at higher temperatures, material selection should be based on the actual operating conditions and required technical specifications.
Standard Sizes and Thicknesses
YILONG can supply EPGC 204/FR5 in a broad thickness range from:
Thickness: 0.1–100 mm
Standard sizes: 1020 × 1220 mm and 1220 × 2440 mm
Other dimensions can be discussed according to the customer's application, machining requirements and order quantity.
YILONG can also provide precision machining for FR5 components based on customer drawings.
Applications of EPGC 204/FR5
Because of its combination of thermal resistance, mechanical strength, electrical insulation and flame retardancy, EPGC 204/FR5 is used in a wide range of industrial and electrical applications.
Electrical and Power Equipment
Insulating supports and separators
Transformer components
Insulating frames and coil supports
Terminal boards
Wiring and electrical insulation components
Low- and high-voltage electrical equipment
Converter and inverter components
Switchgear components
Industrial Machinery
EPGC 204/FR5 can also be machined into structural and wear-resistant components used in industrial equipment, including:
Machine components
Gears and washers
Bearings and bearing supports
Gaskets and spacers
Wear strips
Machining fixtures
Die and mold components
Grinding support plates
Electronic and New Energy Applications
The material is also suitable for electronic and new energy equipment where flame retardancy and electrical insulation are required.
Electronic equipment components
Circuit board fixtures
Wave soldering supports
Battery insulation components
Converter components
Insulating brackets
Equipment support plates
Precision Machining of EPGC 204/FR5
In addition to supplying laminated sheets, YILONG provides machining services for customized FR5 insulation components.
Depending on the design, FR5 sheets can be processed by CNC milling, drilling, routing, grinding and other machining methods.
For components such as insulating brackets, spacers, gaskets, fixtures, support plates and specially shaped parts, customers can provide drawings or dimensional requirements for machining evaluation.
Why Choose YILONG EPGC 204/FR5?
YILONG INSULATION manufactures epoxy glass cloth laminated materials for electrical, electronic and industrial applications. Our EPGC 204/FR5 combines Class F thermal performance, high mechanical strength, flame retardancy and stable electrical insulation for demanding applications.
When selecting FR5, the required thickness, dimensions, operating temperature, mechanical load, electrical requirements and applicable standards should all be considered. YILONG can provide technical information and machining solutions according to specific application requirements.
For EPGC 204/FR5 material, customized sizes or machined FR5 insulation components, please contact YILONG INSULATION: www.yilonginsulation.com, Email: yilong@yilonginsulation.com, WhatsApp: +86 15866869385
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