Blog - JingHong

Glass Fiber Series

How Does Glass Transition Temperature Affect FR4 Sheets?

Glass transition temperature (Tg) plays a crucial role in determining the performance and reliability of FR4 sheets used in printed circuit boards (PCBs) and other electronic applications. The Tg of FR4 materials, typically ranging from 130°C to 180°C, marks the point at which the epoxy resin transitions from a rigid, glassy state to a more flexible, rubbery state. This temperature significantly influences the thermal stability, dimensional accuracy, and overall durability of FR4 sheets. As the temperature approaches and surpasses the Tg, FR4 sheets experience changes in their physical and electrical properties, potentially impacting the functionality and lifespan of electronic components. Understanding the relationship between Tg and FR4 performance is essential for engineers and manufacturers to select the appropriate grade of FR4 material for specific applications and operating conditions.

James Yang

Aug 12, 2025

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Glass Fiber Series

FR4 Sheet Export Guidelines and RoHS Compliance

James Yang

Aug 12, 2025

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Glass Fiber Series

Can 3240 Epoxy Boards Be Used Outdoors?

3240 epoxy boards can indeed be used outdoors, thanks to their exceptional weather resistance and durability. These versatile materials are engineered to withstand various environmental challenges, making them suitable for numerous exterior applications. The epoxy resin matrix, combined with fiberglass reinforcement, creates a robust composite that resists moisture absorption, UV radiation, and temperature fluctuations. This inherent resilience allows 3240 epoxy boards to maintain their structural integrity and electrical insulation properties even when exposed to harsh outdoor conditions. However, it's crucial to note that while these boards exhibit excellent outdoor performance, proper installation and periodic maintenance are essential to maximize their longevity and effectiveness in external environments.

James Yang

Aug 12, 2025

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Glass Fiber Series

How Much Heat Can FR4 Sheets Withstand?

FR4 sheets, renowned for their exceptional thermal properties, can typically withstand continuous operating temperatures of up to 130°C (266°F). This impressive heat resistance stems from the unique composition of FR4 material, which combines fiberglass reinforcement with epoxy resin. The glass transition temperature (Tg) of standard FR4 sheets ranges from 130°C to 140°C, indicating the point at which the material begins to soften and lose its rigid properties. However, it's crucial to note that short-term exposure to higher temperatures, up to about 180°C (356°F), may be possible without significant degradation. The exact heat tolerance can vary based on specific formulations and manufacturing processes, making it essential to consult manufacturer specifications for precise thermal limits in your application.

James Yang

Aug 12, 2025

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Glass Fiber Series

Best FR4 Sheet Suppliers in China for Global Buyers - J&Q

James Yang

Aug 11, 2025

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Glass Fiber Series

3240 Epoxy Boards and Their Role in Solar Energy Solutions

James Yang

Aug 11, 2025

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Glass Fiber Series

The Advantages of UL-Certified FR4 Sheets

James Yang

Aug 8, 2025

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Glass Fiber Series

Why UL Certification Matters for FR4 Insulation Boards?

James Yang

Aug 8, 2025

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Glass Fiber Series

G10 Fiberglass Plate: A Complete Guide for Engineers

James Yang

Aug 8, 2025

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