Blog - JingHong

Phenolic Series

How to Test Dielectric Strength of Bakelite Sheets?

Caroline Jia

Sep 23, 2025

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Phenolic Series

How do Phenolic Cotton Sheets Compare to Bakelite in High-Voltage Use?

Caroline Jia

Sep 22, 2025

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Phenolic Series

Typical Applications for NEMA CE Sheets in Industry

NEMA CE sheets, renowned for their exceptional electrical and mechanical properties, find widespread use across various industrial sectors. These versatile materials, composed of cotton fabric reinforced with phenolic resin, offer a unique combination of strength, durability, and insulation capabilities. In industrial applications, NEMA CE sheets are commonly employed in electrical components, mechanical parts, and high-stress environments. From transformer insulation to gears in heavy machinery, these sheets prove invaluable in scenarios demanding reliable performance under challenging conditions. Their ability to maintain structural integrity while providing excellent electrical insulation makes NEMA CE sheets a go-to choice for manufacturers seeking robust solutions for diverse industrial needs.

Caroline Jia

Sep 22, 2025

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Phenolic Series

What Electrical Components Commonly Use Phenolic Cotton Sheets?

Phenolic cotton sheets are widely utilized in various electrical components due to their exceptional insulating properties, mechanical strength, and durability. These versatile materials find applications in transformers, switchgear, circuit breakers, and high-voltage equipment. Specifically, phenolic cotton sheets are commonly used in terminal boards, insulating barriers, and structural supports within electrical systems. Their ability to withstand high temperatures, resist moisture absorption, and maintain dimensional stability makes them ideal for components that require reliable electrical insulation and mechanical integrity. From power distribution equipment to industrial motors, phenolic cotton sheets play a crucial role in ensuring the safe and efficient operation of numerous electrical devices across diverse industries.

Caroline Jia

Sep 22, 2025

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Phenolic Series

How Does Chemical Resistance Enhance Bakelite's Industrial Applications?

Caroline Jia

Sep 19, 2025

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Phenolic Series

Why is Heat Resistance Crucial for Bakelite in Electrical Systems?

Heat resistance is absolutely essential for Bakelite sheets in electrical systems due to their role in preventing thermal degradation, maintaining structural integrity, and ensuring long-term safety. As electrical components generate heat during operation, Bakelite sheets' ability to withstand high temperatures without melting, deforming, or losing their insulating properties is paramount. This thermal stability allows Bakelite sheets to consistently protect against electrical shorts, fires, and system failures even under demanding conditions. By preserving their mechanical and dielectric strength at elevated temperatures, heat-resistant Bakelite sheets enable the reliable functioning of everything from household appliances to industrial power distribution equipment. Ultimately, the heat resistance of Bakelite sheets is crucial for safeguarding both the performance and safety of modern electrical infrastructure.

Caroline Jia

Sep 19, 2025

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Phenolic Series

How Temperature Affects Bakelite Insulation Performance?

Caroline Jia

Sep 19, 2025

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Phenolic Series

How to Test Bakelite Sheets for Heat and UV Degradation?

Testing Bakelite sheets for heat and UV degradation is crucial for ensuring their long-term performance in various applications. To evaluate thermal aging, samples are typically subjected to accelerated aging tests in ovens at elevated temperatures for extended periods. UV degradation can be assessed through exposure to artificial UV light sources in weathering chambers. After aging, mechanical properties like tensile strength and impact resistance are measured and compared to baseline values. Electrical properties such as dielectric strength and volume resistivity are also evaluated. Visual inspection and weight loss measurements can provide additional insights into degradation. Specialized analytical techniques like FTIR spectroscopy may be used to detect chemical changes in the material structure.

Caroline Jia

Sep 19, 2025

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Phenolic Series

What Are Common Issues with Bakelite Insulation in High-Voltage Systems?

Bakelite sheet insulation in high-voltage systems faces several common issues that can compromise its effectiveness and safety. These include thermal degradation, electrical tracking, partial discharge, and mechanical stress. Over time, exposure to high temperatures and electrical stress can lead to carbonization and breakdown of the Bakelite sheet material. Moisture ingress and contaminants can create conductive paths on the surface, resulting in electrical tracking. Partial discharge activity within voids or at interfaces can gradually erode the insulation. Additionally, mechanical stresses from thermal cycling and vibration can cause cracking or delamination of Bakelite sheet components. Understanding and addressing these issues is crucial for maintaining the reliability and longevity of high-voltage equipment utilizing Bakelite sheet insulation.

Caroline Jia

Sep 18, 2025

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