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Class F DMD Insulation Prepreg adopts a 3-layer structure of polyester film and non-woven fabric, impregnated with modified epoxy resin and baked. It features heat resistance up to 155℃ and dielectric strength ≥40kV/mm. With strong adhesion, low shrinkage and excellent ageing resistance, it is widely used for interlayer insulation of dry-type transformers, slot insulation and turn-to-turn insulation of electric motors. Slitting and custom processing are available.

Lingge Adhesive AMA Insulation Paper is a commonly used high-performance F-grade insulation material for dry-type transformers. Its core features include excellent heat resistance, high mechanical strength, and stable insulation performance, making it suitable for the harsh operating requirements of dry-type transformers. The specific requirements are as follows: 1、 Infrastructure and process characteristics It is made by uniformly coating a special modified epoxy resin in a diamond grid shape on an AMA three-layer composite substrate (polyester film+two-layer cable paper/aramid paper). The epoxy resin coating is normally in the B stage and only needs to be cured during the drying and heating process of the transformer coil, without additional compounding treatment. 2、 Core performance characteristics High heat resistance level: The heat resistance level reaches F level (155 ℃), and some high-end models can reach higher levels. It is fully suitable for the high-temperature conditions of long-term operation of dry-type transformers, with excellent thermal stability, and can ensure long-term operation safety. Outstanding mechanical strength and bonding performance: After curing, epoxy resin can reliably bond adjacent layers of the winding into a fixed whole, and sufficient bonding strength can prevent winding displacement during short circuits, greatly improving the transformer's ability to resist sudden short circuits. Excellent insulation performance: It has high dielectric strength and can replace traditional adhesive insulation paper, reducing insulation thickness. At the same time, the diamond grid point design optimizes air discharge and heat dissipation channels, effectively reducing the risk of corona and partial discharge, and improving insulation reliability. Strong adaptability to working conditions: It has strong overload resistance in the operating environment of dry-type transformers and has good adaptability to harsh temperature fluctuations, vibration and shock working conditions. 3、 Characteristics of Processing Technology The material itself has good flexibility and is suitable for various coil processing techniques such as foil winding and wire winding. It can also be customized into various insulation parts according to drawings to meet the production needs of different specifications of dry-type transformers, with a high pass rate of finished products.

1、 Material structure and process characteristics Reasonable layered structure: The DMD in the name corresponds to a three-layer structure - with polyester fiber non-woven fabric on both sides (D) and polyester film in the middle (M), combined with impregnated epoxy resin, it has both mechanical strength and insulation properties. The advantages of curing are obvious: epoxy resin contains active groups such as epoxy and amine groups, which can be quickly cured at medium and high temperatures. During curing, almost no low molecular weight volatiles are discharged, ultimately forming an insulation structure with extremely low shrinkage rate, avoiding insulation layer void defects. Excellent bonding performance: High bonding strength to copper foil and aluminum foil, with a tensile shear strength of ≥ 3.0MPa, and no delamination or detachment after wrapping and curing. 2、 Core performance characteristics Excellent electrical insulation performance: breakdown voltage ≥ 7.0-10kV, temperature index up to 155 ℃, meeting F-level heat resistance requirements, with excellent flame retardancy, meeting the requirements for safe operation of transformers. Good storage stability: It has a long shelf life under different storage conditions. It can be stored for a long time at room temperature (20 ℃, 50% humidity), and can also ensure a shelf life of 6-12 months when stored at low temperatures. It can still be used after passing the inspection if it exceeds the shelf life. The finished product is in a uniform and stable state: the surface of the product is flat, the resin distribution is uniform, and it will not damage the surface during unwinding. There are no defects such as folds, bubbles, impurities, etc. that affect the insulation performance. Strong processability: The conventional thickness covers 0.12mm-0.50mm, and can be cut into any width according to needs, suitable for processing transformer coils of different specifications. 3、 Application adaptation characteristics As a specialized interlayer insulation material for low-voltage coils of dry-type transformers, it is fully compatible with foil winding and wire winding processes, and can also be extended for inter slot, inter turn, and inter phase insulation of reactors and F-class motors. It is currently the mature and stable preferred material for insulation systems of dry-type transformers.

High-quality insulating prepreg is made of premium base material impregnated with modified epoxy resin and semi-cured.   It features stable insulation performance and high dielectric strength. Both Class F and Class H temperature resistance grades are available. It resists high temperature without embrittlement, moisture-proof and anti-aging.   With uniform resin impregnation, excellent flexibility, easy winding, and firm bonding after hot pressing, no powder falling or delamination.   Widely applicable to dry-type transformers, motors, reactors and rail transit electrical equipment. Custom slitting in thickness and width is supported. Featuring simple processing and compatibility with automated production, it provides a one-stop solution for industrial electrical insulation.

Product Description：     Product Features: Excellent dielectric properties, strong adhesion, and superior heat resistance. Ideal interlayer and ground insulation material for H-class dry-type transformers. Product Dimensions: Available in sheets or rolls according to customer requirements. Product Applications: Suitable for interlayer insulation, end sealing, and ground insulation in H-type dry-type transformer coils. Also used for turn-to-turn insulation in motors and other electrical applications. Product Introduction: SHS prepreg is a soft composite material manufactured by coating polyimide film with an H-class adhesive and polyester nonwoven fabric, followed by impregnation with epoxy pre-cured resin to form a reliable thermal bonding material. It exhibits excellent dielectric performance, strong adhesion, and outstanding heat resistance, making it an ideal interlayer and ground insulation material for H-class dry-type transformers. With a heat resistance rating of H-class (180°C), it is suitable for coil interlayer insulation, end sealing insulation, ground insulation, and motor turn insulation in H-class dry-type transformers.

Product Description：   Our electrical insulating pressboard is a specialized insulation material designed for electrical equipment. It is manufactured from 100% high-purity sulfate wood pulp and processed under high pressure. It integrates excellent electrical insulation properties, high mechanical strength, and good compatibility with insulating oil, effectively isolating electrical currents and protecting electrical equipment from short circuits and breakdown. Through strict control of the production process, the product features uniform thickness, high density, low shrinkage, and excellent flatness, enabling it to withstand mechanical stresses during equipment operation and maintain stable performance over long-term use. It is widely used in oil-immersed transformers, reactors, capacitors, switches, motors, and other electrical equipment as winding insulation, barriers, insulation pads, and other components. Our electrical insulating pressboard complies with international standards such as IEC 60641-3-1992 and the national standard GB/T 19264.3-2003. It is non-toxic, environmentally friendly, and does not contaminate transformer oil, meeting the environmental requirements of modern industrial production. We support customization services, covering thickness (0.5–8 mm), dimensions (1000×2000 mm, 4200×2100 mm, etc.), and specifications to meet the diverse needs of different equipment and projects.    

Product Description:     High-quality H-class polyimide motor film is a premium insulating material specifically designed for motors and electrical equipment, suitable for applications that require outstanding performance under high thermal and electrical stress. Rated as an H-class insulation material (180°C) and manufactured using advanced polyimide polymer technology, it offers exceptional dielectric strength, superior heat resistance, and excellent mechanical stability. Its outstanding quality makes it an ideal solution for insulating motor windings, transformer layers, and other high-reliability electrical components. H-class polyimide motor film maintains stable insulation performance across a wide temperature range, ensuring long-term reliability even in harsh environments. It resists thermal aging, chemical corrosion, and mechanical stress, thereby extending the service life of motors and transformers. With high tensile strength and dimensional stability, H-class polyimide motor film effectively prevents breakdown and enhances the durability of insulation systems.

As a critical insulating and supporting component for oil-immersed power transformers and reactors, the Insulating Oil Duct Spacer Bar Curtain is mainly used to fix and isolate windings, maintain uniform gaps between core silicon steel sheets and winding cakes, and form efficient cooling oil channels, thereby ensuring smooth oil circulation and reliable insulation performance. The product is manufactured in strict accordance with relevant industry standards, using high-purity electrical-grade materials such as pressboard (conforming to IEC 60641) or epoxy-laminated paper, which have excellent dielectric strength and mechanical stability. Through CNC precision processing technology, the spacer bars are evenly fixed on the insulating base paper, ensuring consistent spacing accuracy and flat surface, which effectively avoids oil flow blockage and improves heat dissipation efficiency of the transformer. The product has excellent electrical insulation performance, with a rated voltage of 110-1100kV, which can effectively isolate the electrical connection between the iron core and the winding, block partial discharge paths, and meet the operation requirements of high-voltage and high-load equipment.

  Product Description：     Transformer insulation componentsMaterial   The Oil Channel Spacer Strip is crafted from high-grade transformer pressboard as the base material, which is then bonded and consolidated under pressure using specialized insulating adhesive.   Manufacturing Process   Advanced production techniques and state-of-the-art equipment are employed to eliminate common defects such as air entrapment, delamination, and brittleness that may arise in conventional laminated products. The process begins with cooking, rotary-cutting, and drying of the raw wood to form the veneer. The veneer is then coated with a proprietary insulating adhesive, followed by high-temperature, high-pressure lamination to form the finished product.   Product Overview   The Oil Channel Spacer Strip is a premium insulating and structural component engineered to deliver robust mechanical support and maintain precise, consistent spacing for cooling oil channels within transformer windings. Manufactured from high-performance pressboard or composite insulating materials, it offers exceptional dielectric strength, dimensional stability, and mechanical rigidity, ensuring reliable insulation and structural integrity during normal operation and under extreme operating conditions.   This transformer-grade oil channel spacer exhibits outstanding resistance to heat, moisture, transformer oil, and chemical corrosion, making it ideally suited for the rigorous operating environments of power transformers. Its smooth, uniform surfaces and precision-engineered dimensions enable effortless handling, seamless installation, and perfect integration into transformer assemblies, without compromising the insulation performance or safety of conductive components.

Product Description：   Insulation mesh fabric is a reinforced electrical insulation material based on glass fiber or polyester, treated with an alkali-resistant epoxy insulation coating. It is primarily used for interlayer insulation and structural reinforcement in electrical equipment such as transformers, motors, and switchgear. Its core value lies in suppressing partial discharge, resisting electrical aging, enhancing mechanical strength, and improving operational safety. Insulation mesh fabric is not an ordinary glass fiber mesh but a functional composite material specifically designed for high-voltage electrical systems. By controlling mesh uniformity and coating adhesion, it achieves a dual function of "skeleton + barrier" in processes such as resin casting, winding wrapping, or lamination, preventing insulation degradation and short-circuit risks. Its technological evolution has progressed from basic glass fiber mesh to multiple generations of products, such as epoxy-impregnated and prepreg types.

Applications: Widely used in motors, transformers, PCB boards, electrical switches, new energy batteries, aerospace, and other fields, suitable for insulating structural parts, spacers, gaskets, and testing jigs. We provide factory direct supply, with competitive prices and fast delivery. Each product undergoes strict quality inspection to ensure stable performance and reliable quality. Choose our insulating epoxy board to protect your equipment and improve production efficiency!

Transformer insulating mesh fabric (epoxy fiberglass mesh fabric) is a core insulating structural material for dry-type/oil-immersed transformers, primarily serving to enhance coil mechanical strength, prevent cracking, and assist in insulation and heat dissipation.

Product Description：     Voltage pressboard is one of the oldest and most widely used solid insulation materials in the electrical industry. The performance of voltage pressboard directly determines the safety and service life of electrical equipment, especially oil-immersed transformers. Statistical data show that approximately 80% of transformer failures are caused by insulation structure or material damage. With the accelerated construction of ultra-high voltage (UHV) grids, the demand for high-density, low dielectric loss, and aging-resistant pressboards continues to grow. However, high-end products in China still partially rely on imports. Voltage pressboard offers outstanding electrical insulation performance, high mechanical strength and tear resistance, excellent heat resistance and aging resistance, low dielectric loss with stable performance, a smooth surface, uniform thickness, easy processability and cutting, and is environmentally friendly, non-toxic, and free of harmful substances.

We are a professional manufacturer of transformer insulation materials, with complete production equipment and strict quality control system, can provide you with high-quality insulation I-beam spacers and one-stop insulation solutions. Welcome to contact us for quotation and sample customization!  

Product Description：   High-quality H-class polyimide motor film is a premium insulation material specifically designed for motors and electrical equipment, suitable for applications requiring exceptional performance under high thermal and electrical stress. Classified as an H-class insulation material (180°C), it is manufactured using advanced polyimide polymer technology, offering outstanding dielectric strength, superior heat resistance, and excellent mechanical stability. Its exceptional quality makes it an ideal solution for insulating motor windings, transformer layers, and other high-reliability Electrical Components. H-class polyimide motor film maintains stable insulation performance across a wide temperature range, ensuring long-term reliability even in harsh environments. It resists thermal aging, chemical corrosion, and mechanical stress, thereby extending the service life of motors and transformers. With high tensile strength and dimensional stability, H-Class Polyimide Motor Film for Transformers effectively prevents breakdown and enhances the durability of insulation systems.

Product Description: ​ Typical Application Scenarios​ Impregnated DMD materials for transformers are primarily used in insulation systems for high-end electrical equipment, with a particular focus on the following scenarios: ✅ Low-voltage coils of dry-type transformers:​ Used as interlayer insulation, end-sealing insulation, and lining insulation for foil windings, significantly enhancing short-circuit withstand capability. ✅ Class F motors:​ Used for slot insulation, phase-to-phase insulation, and turn-to-turn insulation, replacing imported HTEPP materials. ✅ Special requirement scenarios:​ Customizable in red, dark green, and natural white (red is most commonly used for process identification), and supports value-added processing, including slotting, die-cutting, and adhesive backing. Key Points for Handling and Storage​ Operation Instructions​ Copper foil and DMD prepreg are typically wound alternately. Precise epoxy coating requires a glue impregnation machine. The processing of DMD fabric includes: feed rollers → glue impregnation rollers (fully immersed in the resin tank) → liquid removal rollers → glue scraping mechanism (excess resin is removed by rubber scrapers and recycled in an environmentally friendly manner) → winding process.

Our Electrical Insulating Crepe Paper is a high-quality cellulose-based insulation material, specially engineered for the insulation of electrical equipment in various industrial scenarios. Made from 100% superior sulfate wood pulp, it undergoes strict mechanical creping processing to form a uniform, flexible structure that is free from conductive particles, ensuring excellent electrical insulation performance.  

Product Description：   Professional Transformer Insulation PET Baffle​ – Your Shield for Uncompromising Electrical Safety and Performance Engineered to excel in the most demanding electrical environments, our transformer insulation PET baffle stands as a pinnacle of material innovation and reliability. Designed for dry-type and oil-immersed transformers, as well as large and medium-sized motors, this high-performance barrier delivers unmatched insulation integrity, mechanical strength, and thermal endurance. Crafted from multiple layers of premium polyester film and bonded with Class F insulation adhesive, Flame-Retardant PET Baffle for Insulation ensures superior dielectric protection, outstanding flame resistance, and consistent performance under extreme temperatures. Whether guarding against electrical faults, enhancing thermal management, or extending equipment lifespan, this PET baffle is built to protect—and perform—when it matters most. Key Features:​ ✅ Exceptional dielectric strength & insulation reliability ✅ High mechanical toughness & dimensional stability ✅ Flame-retardant, self-extinguishing, and resistant to moisture, oil, and chemicals ✅ Stable performance across a wide temperature range ✅ Customizable in size, thickness, and design for seamless integration Applications:​ Dry-type & oil-immersed transformers Large & medium motors and generators High-voltage switchgear & busbar insulation Industrial, utility, and renewable energy systems

Product Overview: The insulated I-shaped stay bar is a high-performance electrical insulation component, produced by advanced pultrusion technology, which ensures uniform material structure, smooth surface and precise size. It adopts alkali-free glass fiber impregnated with thermosetting epoxy resin, which combines the light weight of fiberglass with the excellent insulation and corrosion resistance of epoxy resin, making it superior to traditional metal support bars in electrical and mechanical performance. The I-shaped structure is scientifically designed to balance the functions of winding support and interlayer ventilation, effectively reducing the temperature rise of electrical equipment and extending its service life.  

Product Description: ​ Material: Oil-immersed transformer insulation cylinders are made from transformer pressboard and bonded/pressed with insulating adhesive. Production Process: Advanced technology and equipment are used to prevent issues such as bubbles, delamination, and brittleness in laminated boards. Each board undergoes cooking, rotary cutting, drying, coating with special insulating adhesive, and final forming under high temperature and pressure. Product Introduction: Insulation paper tubes are used in oil-immersed transformers. They are manufactured from transformer pressboard as the raw material, bonded and pressed with insulating adhesive. The product adopts new processes and equipment to avoid common issues in laminated boards. Individual boards are prepared through cooking, peeling, drying, coating with special insulating adhesive, and final production under high temperature and pressure. The insulation paper tube serves as a support frame for transformer windings, responsible for separating oil ducts between coils. As part of the main winding insulation, it provides sufficient mechanical strength and pressure resistance. Our company is capable of processing and producing various specifications of insulation paper tubes and angle rings based on customer-provided drawings and dimensions. These materials are primarily suitable for transformer insulation requirements with voltage levels of 110kV and above. If customers identify quality issues upon receiving the product, we will arrange re-shipment to ensure their rights and interests.