In the field of electrical insulation and printed circuit boards (PCBs), FR4 fiberglass sheet is one of the most reliable and widely used materials. With exceptional thermal resistance, electrical insulation, and mechanical strength, FR4 is trusted across electronics, automotive, aerospace, power distribution, and telecom industries.
As a global supplier, YILONG provides high-quality FR4 fiberglass sheets that meet international standards, ensuring consistent performance in demanding applications.
FR4 fiberglass sheet is a composite laminate made from woven fiberglass cloth combined with an epoxy resin binder.
FR stands for 'Flame Retardant' and '4' refers to a specific grade of flame-retardant epoxy. Key features include:
- Excellent flame resistance (UL 94-V0)
- Low water absorption
- High dielectric strength
- Stable mechanical properties
Common applications: PCB substrates, insulation barriers, structural supports, and precision components.
|
Property |
Typical Value |
Features |
|
Heat Resistance |
130°C–150°C |
Higher in short-term exposure |
|
Glass Transition Temperature (Tg) |
~130°C / up to 170°C+ |
Critical for high-temp PCB design |
|
Thermal Conductivity |
~0.25 W/m·K |
Ideal for insulation applications |
FR4 maintains its structure and performance under rated temperatures, offers low thermal conductivity, and is available in high-Tg grades for extreme environments.
|
Property |
Typical Value |
Significance |
|
Dielectric Strength |
16–20 kV/mm |
Reliable in high-voltage systems |
|
Dielectric Constant (Dk) |
~4.5 |
Stable across wide frequency range |
|
Insulation Resistance |
10⁹–10¹¹ Ω |
Prevents leakage and electrical failures |
FR4 is ideal for high-speed PCBs, RF boards, and power electronics, providing consistent insulation and low signal loss.
|
Property |
Typical Value |
Benefit |
|
Tensile Strength |
340–400 MPa |
Withstands vibration and stretching |
|
Flexural Strength |
>400 MPa |
Allows bending without fracture |
|
Compressive Strength |
250–300 MPa |
Supports heavy loads |
|
Dimensional Stability |
High |
Stable under temperature/humidity changes |
The combination of tensile, flexural, and compressive strength makes FR4 suitable for both structural and electrical insulation applications.
- Electronics: PCB substrates, component spacers, insulation plates
- Automotive: EV battery insulation barriers, ECU control module supports
- Aerospace: Lightweight, fire-resistant structural panels
- Power Distribution: Switchgear panels, insulating supports
- Telecom: RF and microwave circuit boards
YILONG FR4 fiberglass sheets meet or exceed the following:
- IEC 60893 laminated sheet standards
- UL 94-V0 flame retardancy rating
- NEMA G10/G11 performance grades
- RoHS compliance
- Optional halogen-free and high-Tg grades
- Thickness: 0.2 mm to over 20 mm
- Grade: Standard, high-Tg, or halogen-free
- Surface Finish: Matte, gloss, or copper-clad
- Color: Green, yellow, or custom options
- Processing: CNC cutting, drilling, fabrication available
- Premium raw materials ensuring durability and performance
- Wide range of specifications for PCB, insulation, and structural parts
- Precision machining with CNC capabilities
- Global supply to over 30 countries
With its combination of thermal stability, electrical insulation, and mechanical strength, FR4 fiberglass sheet remains the industry standard for demanding applications. Whether you need high-frequency PCBs or heavy-duty insulation barriers, YILONG offers cost-effective, reliable solutions tailored to your requirements.
Contact YILONG for detailed specifications, free samples, or bulk pricing.
When performance, durability, and cost efficiency are essential, Phenolic Sheets stand out as a dependable choice. These industrial laminates are engineered to deliver exceptional strength, electrical insulation, and resistance to heat, moisture, and a wide range of chemicals. Built for demanding conditions, Phenolic Sheets perform reliably even in high-stress environments.
In modern industrial manufacturing and electrical insulation sectors, phenolic laminates remain a cornerstone material thanks to their robust mechanical performance, dependable dielectric properties, and notable resistance to chemical corrosion. Among the broad spectrum of phenolic laminate products, Phenolic Paper Sheets and Phenolic Cotton Cloth Sheets represent two of the most widely utilized and technically significant variants. Each offers distinct performance advantages, making them particularly suited for different engineering and operational contexts.
Engineering Plastics are a category of high-performance polymers designed to meet demanding requirements that go beyond the capabilities of most commodity plastics. Known for their exceptional mechanical properties, these materials excel in heavy-duty applications where factors such as shock absorption, chemical resistance, and dimensional stability are critical.
Bearing grade PEEK is specially formulated with solid lubricants such as PTFE, graphite, and sometimes carbon fiber. These additives provide exceptional tribological properties, resulting in very low friction, reduced wear, and extended component life.
While PEEK sheet and PEEK plate are both made from the high-performance thermoplastic Polyetheretherketone (PEEK), there are clear differences in thickness and application focus:
Polyether Ether Ketone (PEEK) is recognized in engineering circles as one of the most capable thermoplastic polymers available. It offers a rare balance of mechanical strength, chemical resistance, and thermal stability, making it an excellent choice for situations where both performance and durability are paramount. From aerospace components to medical implants, PEEK’s reliability in extreme environments ensures its continued relevance as industries demand more from their materials.
Epoxy fiberglass tubes are widely valued in various industries due to their exceptional strength, durability, and insulating characteristics. However, precise handling of these materials demands specialized tools and techniques to ensure both accuracy and safety. This comprehensive guide delves into the key methods for cutting and machining Epoxy fiberglass tubes, offering practical insights for both professionals and DIY enthusiasts.
Electrical Insulation Materials are fundamental components in the manufacturing and operation of electrical and electronic equipment. According to national classification standards, insulation materials are systematically divided into seven principal series. YILONG, a leader in advanced insulation solutions, presents this comprehensive overview of each series to support industry professionals in selecting the optimal materials for their applications.
YILONG, a trusted name in composite material solutions, has announced advancements in its Fiberglass Rod manufacturing process, designed to meet the needs of industries operating in challenging and corrosive environments. Fiberglass Rods are proving to be an ideal replacement for traditional metal products, offering superior corrosion resistance, electrical insulation, and structural performance.
In the field of electrical insulation and printed circuit boards (PCBs), FR4 fiberglass sheet is one of the most reliable and widely used materials. With exceptional thermal resistance, electrical insulation, and mechanical strength, FR4 is trusted across electronics, automotive, aerospace, power distribution, and telecom industries.
No.3, Mianzhi Street, Zhucheng, Shandong, China
Copyright © 2025 by Qingdao Yilong Insulation Material Company Limited All Rights Reserved
