Bakelite Sheet is a high-performance thermosetting laminate widely recognized for its durability, electrical insulation capability, and thermal stability. Produced from phenolic resin and reinforced with paper, cotton, or glass fabric, Bakelite Sheets have become indispensable in electrical, mechanical, and industrial engineering. Their combination of strength, heat resistance, and cost-effectiveness makes them one of the most reliable insulating materials in modern manufacturing.
Basic Information
Material: Phenolic Resin + Reinforcement Material
Color: Black, Orange
Thickness Range: 2mm – 100mm
Regular Size: 1040mm × 2080mm, 1220mm × 2440mm
Packaging: Standard Export Packaging with Pallet Protection
Understanding the Composition and Structure of Bakelite Sheet
Bakelite Sheets are produced from phenol-formaldehyde resin, one of the earliest synthetic polymers known for its excellent thermal and electrical properties. During production, a chemical reaction between phenol and formaldehyde creates a three-dimensional, cross-linked molecular network. Once fully cured under heat and pressure, the material becomes a rigid, non-melting, and dimensionally stable thermoset.
This cross-linked structure is what gives Bakelite its hallmark advantages—superior heat resistance, excellent electrical insulation, and strong mechanical performance. Unlike thermoplastics, Bakelite will not soften or deform when exposed to heat, making it suitable for demanding industrial environments.
Key Physical Properties
Bakelite Sheets offer a balanced set of mechanical and physical characteristics, including:
l High compressive strength for load-bearing applications
l Good dimensional stability due to a low thermal expansion coefficient
l Density of 1.35–1.45 g/cm³, ensuring lightweight but robust performance
l Smooth surface finish suitable for precision machining
l Excellent wear and abrasion resistance, enhancing long-term durability
These properties allow Bakelite Sheets to be used in parts requiring stable geometry, reliable performance, and resistance to harsh working conditions.
Electrical and Thermal Performance
As an insulating material, Bakelite is widely recognized for:
l High dielectric strength
l Low dielectric constant
l High volume resistivity
These characteristics ensure safe and stable operation in high-voltage and high-frequency environments. Thermally, Bakelite Sheets can withstand continuous operating temperatures up to 130°C without significant degradation. Their low thermal conductivity also makes them suitable for applications requiring both insulation and heat resistance.
Industrial Applications of Bakelite Sheet
l Electrical and Electronics Industry
Bakelite Sheets remain a preferred insulation material in electrical systems. They are widely used in:
1. Transformer and switchgear insulation
2. High-voltage partitions and barriers
3. Terminal boards and insulating bushings
4. Electrical panels, motor components, and protective housings
5. PCB baseplates for low-frequency circuits
Their stability under electrical stress makes them an essential material in ensuring equipment reliability and safety.
l Automotive and Aerospace Applications
In automotive engineering, Bakelite Sheets are applied in components exposed to heat and friction, such as:
1. Brake system parts
2. Clutch components
3. Transmission insulation elements
4. In aerospace applications, where lightweight and reliable insulation is critical, Bakelite Sheets are used for:
5. Interior structural panels
6. Cable supports and electrical connectors
7. High-strength insulating components
Their combination of light weight and mechanical stability contributes to improved system efficiency and long-term safety.
l Industrial Machinery and General Manufacturing
Bakelite Sheets are valued for their machinability and mechanical strength, making them suitable for:
1. Jigs, fixtures, and machining plates
2. Wear-resistant mechanical parts
3. Welding fixtures and thermal shields
4. Chemical-resistant liners for tanks and pipelines
5. Gears, bearings, and precision tooling components
Their resistance to chemicals and heat ensures consistent performance across diverse industrial environments.
Manufacturing Process and Available Grades
Bakelite Sheets are produced using advanced lamination and curing processes. The phenolic resin is combined with a reinforcement substrate—paper, cotton, or glass fabric—then layered and pressed under controlled temperature and pressure to initiate resin cross-linking. After curing, the sheets are trimmed, stabilized, and inspected for quality.
Common industry grades include:
l XX Grade – Paper-based phenolic with excellent electrical properties
l XXX Grade – Cotton-reinforced for enhanced mechanical strength
l C Grade – General-purpose paper phenolic for economical applications
l CE Grade – Glass fabric-reinforced with superior mechanical and electrical performance
l LE Grade – Linen-based with excellent machinability and strength
Each grade is designed for specific performance requirements depending on electrical, thermal, and mechanical needs.
Quality Assurance and Testing
To ensure consistent and reliable performance, YILONG applies strict quality control measures throughout the manufacturing cycle, including:
l Resin purity and filler inspection
l Controlled curing process monitoring
l Dimensional accuracy checks
l Dielectric strength and resistivity testing
l Flexural, tensile, and impact strength evaluation
l Thermal aging and heat resistance analysis
These measures guarantee that every Bakelite Sheet meets industry standards and performs reliably in end-use applications.
Conclusion
Bakelite Sheets continue to play a vital role in modern industrial applications thanks to their outstanding electrical insulation, mechanical strength, and thermal stability. Their versatility makes them suitable for industries ranging from electronics to automotive and heavy machinery. As demand for reliable insulating materials grows, Bakelite remains a trusted and cost-effective solution for engineers and manufacturers.
If you need high-quality Bakelite Sheets tailored to your project requirements, YILONG offers professional support, consistent quality, and over 20 years of experience in insulating materials.
Contact YILONG
Email: yilong@yilonginsulation.com
WhatsApp: +86-158-6686-9385
For technical consultation or product details, our team is ready to assist you.
Bakelite Sheet is a high-performance thermosetting laminate widely recognized for its durability, electrical insulation capability, and thermal stability. Produced from phenolic resin and reinforced with paper, cotton, or glass fabric, Bakelite Sheets have become indispensable in electrical, mechanical, and industrial engineering. Their combination of strength, heat resistance, and cost-effectiveness makes them one of the most reliable insulating materials in modern manufacturing.
As industries continue to demand high-performance insulating materials with superior mechanical strength and thermal stability, phenolic cotton sheets and Bakelite Sheets remain two of the most widely used options. Although both materials are based on phenolic resin systems, their compositions, performance characteristics, and ideal application scenarios differ significantly. Understanding these distinctions helps engineers, designers, and procurement specialists select the most suitable material for their projects. This article provides a clear and professional comparison, offering valuable insights for anyone involved in electrical insulation, mechanical components, or industrial manufacturing.
Bakelite may be more than 100 years old, but it remains one of the most dependable engineered materials in today’s industrial world. First formulated by Leo Baekeland in 1907, this thermosetting phenolic plastic quickly became famous for its stability, heat resistance, and excellent dielectric performance. Today, Bakelite Sheets are widely used in electrical systems, mechanical assemblies, and high-temperature environments where reliability is essential.
As global industries continue to pursue greater efficiency, safety, and sustainability, the demand for high-performance electrical insulation materials is growing rapidly. From electrical engineering and renewable energy to transportation and industrial manufacturing, insulation products are playing an increasingly critical role in enabling reliable and efficient operations. This article explores the latest development trends in electrical insulation materials and how innovative manufacturers like YILONG are positioned to meet global market needs.
As industries push toward higher safety, lightweight structures, and long-term reliability, epoxy fiberglass tubes - often known as FRP tubes or epoxy glass fiber reinforced tubes - have become essential in electrical insulation, structural engineering, and mechanical reinforcement. Many engineers and buyers ask the same question: How strong is an epoxy fiberglass tube? This article explores the material’s strength, characteristics, applications, performance parameters, and why epoxy fiberglass tubes continue to gain market attention across global industries.
As industries worldwide continue to advance toward higher efficiency and greater reliability, demand for lightweight yet ultra-strong materials is rising sharply. Among the high-performance polymer composites, Carbon Fiber Reinforced PEEK Sheets (CF-PEEK sheets) have emerged as one of the most sought-after materials due to their exceptional mechanical properties, chemical resistance, and stability under extreme conditions. This article provides an overview of CF-PEEK sheets, covering their characteristics, key parameters, applications, market outlook, and the advantages offered by YILONG’s carbon fiber PEEK products.
Nylon Boards and Bakelite Boards are two widely used materials in the insulation industry. Although both serve as effective electrical insulators, they differ significantly in composition, performance, and suitable applications. Understanding these differences helps engineers, buyers, and manufacturers select the right insulation material based on operating temperature, mechanical requirements, and environmental conditions.
The 3241 Semiconductor Insulation Board, also known as Epoxy-Phenolic Glass Cloth Laminated Sheet, is a high-performance insulating material widely used in electrical and mechanical engineering. Manufactured with epoxy resin modified with phenolic resin and high-quality electrical-grade glass cloth, this material offers an ideal balance of insulation strength, heat resistance, mechanical strength, and anti-corona performance. Its stable performance at elevated temperatures and under high electrical stress makes it a preferred choice in many industrial applications.
3240 and 3241 Epoxy Sheets are high-performance laminated materials widely applied in electrical, industrial, aerospace, and automotive industries. Both are glass cloth-reinforced epoxy-phenolic laminates, but they differ in resin formulation and resulting performance, making each suitable for specific industrial requirements. Understanding these differences is crucial for selecting the most appropriate material for insulation, structural, or high-temperature applications.
Pipeline corrosion is one of the most costly and dangerous challenges faced in oil, gas, water, and chemical processing industries. When dissimilar metals come into contact, galvanic corrosion can begin rapidly, compromising pipeline reliability and leading to leaks, failures, and costly maintenance. Flange Isolation Gasket Kits provide a proven solution by creating an electrical barrier that stops unwanted current flow at critical flange connections. Using high-performance dielectric Isolation Kits is one of the most effective ways to protect pipelines, extend service life, and reduce long-term operating costs.
No.3, Mianzhi Street, Zhucheng, Shandong, China
Copyright © 2025 by Qingdao Yilong Insulation Material Company Limited All Rights Reserved
