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.
Material Composition and Performance Characteristics
The 3241 semiconductor insulation sheet is engineered with a carefully controlled resin system to achieve a semi-conductive surface resistivity range, enabling efficient suppression of corona discharge in high-voltage environments. Key performance characteristics include:
l High dielectric strength for stable operation in demanding electrical systems
l Excellent heat resistance, suitable for continuous use in Class H (180°C) environments
l High mechanical strength, including impact, tensile, and compressive resistance
l Stable surface resistivity, enabling corona suppression and preventing insulation degradation
l Good dimensional stability, ensuring long-term performance under mechanical load
l Low moisture absorption, maintaining insulation performance in humid conditions
l Strong bonding reliability, thanks to the epoxy-phenolic hybrid resin system
These combined properties make the 3241 insulation board superior to standard epoxy laminate materials in corona-critical and high-temperature operations.
Primary Application Fields of 3241 Semiconductor Insulation Board
1. Electrical Motors and Traction Motors
The material is widely used in high-performance motor systems due to its excellent insulation and corona resistance.
l Slot liners, slot wedges, and phase insulation
l End-winding support and insulation components
l Suitable for high-voltage motors, traction motors, compressors, and industrial drives
l Prevents corona discharge at winding ends, extending insulation life and improving reliability
l The anti-corona performance makes it especially valuable in H-class traction motors and transport equipment such as electric locomotives and metro vehicles.
2. High-Voltage Electrical Equipment
3241 sheets are commonly used in the internal insulation structures of high-voltage systems:
l Insulation supports inside transformers and reactors
l Structural insulating parts separating different voltage levels
l High-voltage bushing insulation and corona-resistant components
l Cable termination and lead-out insulation protection
l The material’s semi-conductive surface layer helps maintain electric field uniformity and reduce partial discharge.
3. Mechanical and Wear-Resistant Components
Beyond electrical insulation, the 3241 laminated board is also valued for its mechanical properties:
l High-strength insulating spacers and pads
l Wear-resistant guides and sliding components
l Non-metallic structural components for high-temperature environments
l Its rigidity and thermal stability make it suitable for long-term mechanical use without deformation.
4. Electronics, Automation, and Instrumentation
The material is widely used in:
l Internal insulation plates for industrial control systems
l Insulation pads for power electronics
l Precision instrument structures requiring arc resistance
l High-temperature insulating barriers and support parts
l Its combination of strength and electrical performance ensures durability in demanding industrial environments.
Comparison With Other Insulating Materials
The 3241 Semiconductor Insulation Board stands between standard epoxy glass laminates (such as G10, G11) and high-end corona-resistant materials.
|
Property |
G10 |
G11 |
3241 Semiconductor Board |
|
Heat Class |
130°C |
155°C |
180°C (H-Class) |
|
Corona Resistance |
Low |
Medium |
Excellent |
|
Mechanical Strength |
Good |
Very Good |
Excellent |
|
Surface Resistivity |
High |
High |
Controlled semi-conductive |
|
Application Focus |
General insulation |
High heat |
High voltage + corona suppression |
This makes the 3241 material uniquely suited for high-voltage equipment, traction motors, and corona-critical applications, where G10/G11 cannot meet long-term stability requirements.
Industrial Trends and Market Demand
With global demand for high-efficiency motors, electric vehicles, renewable energy equipment, and smart grid infrastructure, the use of advanced insulating materials such as 3241 is increasing rapidly.
Key market drivers include:
l Growth of electric locomotive and metro motor manufacturing
l Expansion of high-voltage electrical equipment production
l Demand for high-end epoxy-phenolic laminates in automation equipment
l Increasing safety standards requiring corona-resistant insulation materials
Manufacturers and OEMs are actively seeking materials with longer service life, higher reliability, and better performance at elevated temperatures—all advantages offered by the 3241 semiconductor insulation sheet.
Why Choose 3241 sheets from YILONG
YILONG provides high-quality 3241 epoxy-phenolic glass cloth laminated boards with consistent quality, precise thickness tolerance, and stable electrical properties. Advantages include:
l Strict control of surface resistivity for reliable corona suppression
l High-temperature curing process ensuring uniform mechanical strength
l Wide customization options (thickness, machining, finished parts)
l Global supply capability and fast delivery
l Technical support for design, application engineering, and material selection
l YILONG supports both standard sheet supply and CNC-machined insulation components based on customer drawings.
Conclusion
The 3241 Semiconductor Insulation Board is a high-performance laminated material combining insulation, heat resistance, mechanical strength, and corona resistance. Its unique characteristics make it highly suitable for high-voltage systems, traction motors, electrical equipment, and high-temperature mechanical structures.
As industrial systems continue to evolve toward higher voltage, higher efficiency, and longer service life requirements, the 3241 insulation board is becoming increasingly essential in the global market.
For technical data, quotations, or customized solutions, please contact YILONG at yilong@yilonginsulation.com for further assistance.
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