Blog - JingHong

Glass Fiber Series

3240 Epoxy Sheet Chemical Resistance Guide

James Yang

Sep 10, 2025

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Phenolic Series

The Evolution of Phenolic Cotton Sheet in Industrial Use

Caroline Jia

Sep 10, 2025

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Phenolic Series

How to Identify Original Bakelite Sheet from Alternatives?

Identifying authentic Bakelite sheet from alternatives requires a combination of visual inspection, physical tests, and specialized techniques. Genuine Bakelite sheets exhibit distinctive characteristics such as a dense, smooth surface, unique coloration, and a subtle phenolic odor when heated. To verify authenticity, experts recommend the "hot pin test," where a heated pin produces a formaldehyde smell on real Bakelite. Additionally, examining the sheet's weight, sound when tapped, and reaction to UV light can provide valuable clues. For industrial applications, laboratory testing methods like FTIR spectroscopy offer definitive confirmation. By employing these methods, manufacturers and consumers can ensure they're working with genuine Bakelite sheets, capitalizing on the material's renowned electrical insulation and heat-resistant properties.

Caroline Jia

Sep 10, 2025

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Glass Fiber Series

The Difference Between FR4 Epoxy Sheet and Other Laminate Boards

James Yang

Sep 10, 2025

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Phenolic Series

Environmental Considerations of Using Bakelite Sheet

Caroline Jia

Sep 10, 2025

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Glass Fiber Series

Why FR4 Epoxy Sheet Is the Industry Standard for PCB Boards?

James Yang

Sep 10, 2025

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Phenolic Series

Environmental Impact of Phenolic Cotton Sheet Manufacturing

The manufacturing of phenolic cotton sheets, while producing a valuable industrial material, does have environmental implications. The process involves combining cotton fabric with phenolic resins under heat and pressure, which can lead to emissions of volatile organic compounds (VOCs) and greenhouse gases. Additionally, the production requires significant energy input and raw materials, including cotton and petroleum-based phenolic resins. Water usage in the manufacturing process and potential chemical runoff are also environmental concerns. However, the durability and longevity of phenolic cotton sheets can offset some of these impacts by reducing the need for frequent replacements. Manufacturers are increasingly adopting more sustainable practices to mitigate these environmental effects, such as improving energy efficiency, reducing waste, and exploring eco-friendly alternatives for raw materials.

Caroline Jia

Sep 10, 2025

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Glass Fiber Series

FR4 Epoxy Sheet Moisture Absorption and Stability

FR4 epoxy sheets are renowned for their exceptional moisture resistance and dimensional stability, making them a cornerstone material in the electronics industry. These fiberglass-reinforced epoxy laminates exhibit remarkably low water absorption rates, typically less than 0.1% after 24 hours of immersion. This impressive moisture resistance stems from the tightly cross-linked epoxy resin matrix and the hydrophobic nature of the glass fibers. The material's ability to maintain its electrical and mechanical properties in humid environments ensures the reliability and longevity of printed circuit boards (PCBs) and other electronic components. Understanding the nuances of FR4's moisture absorption characteristics is crucial for engineers and manufacturers seeking to optimize their product performance and durability.

James Yang

Sep 10, 2025

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Glass Fiber Series

Comparing 3240 Epoxy Sheet to Other Epoxy Laminates

James Yang

Sep 9, 2025

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