Transformer Insulation Materials Manufacturers

Epoxy Glass Fiber Mesh Cloth is a high-performance insulating material made from alkali-free, wax-free, silane-treated glass fiber yarn and polyester filament woven into a square-hole mesh fabric. It is produced through a process of high-temperature dehydration, epoxy resin impregnation, drying, curing, and shaping. The material is thoroughly impregnated with epoxy resin, resulting in a bubble-free internal structure with no partial discharge. Its temperature resistance reaches Class H. It maintains high mechanical strength under both normal and high-temperature conditions, ensuring that cast transformers, reactors, and other equipment operate safely and reliably.

DMD Epoxy Prepreg is a flexible insulation material with a sandwich structure: a middle layer of polyester film for electrical strength and tear resistance, surrounded by two layers of polyester non-woven fabric for flexibility and resin absorption. Impregnated with epoxy resin and baked to a semi-cured (B-stage) state, it maintains good resin flowability and low volatility during high-temperature curing, forming a durable structure that provides both mechanical protection and electrical insulation.

Diamond Dot Paper (DDP) is an insulating material produced by applying a special modified epoxy resin in a diamond-shaped pattern onto electrical insulating paper, followed by B-stage curing.Working Principle: Heating & Melting: The diamond-shaped epoxy resin melts at a specific temperature during coil drying, becoming tacky. Bonding & Curing: As temperature increases, the resin fully cures (C-stage), firmly bonding adjacent coil layers. Gas Release: The dot-shaped resin pattern allows gases to escape through uncoated areas during curing. Oil Impregnation: Transformer oil can fully penetrate the insulation through areas without coating.

The transformer rubber vibration isolator is an elastic damping component installed between the transformer bottom and its foundation. Its high elasticity and damping properties absorb operational vibrations and block noise transmission, effectively mitigating low-frequency structural noise interference with the surrounding environment—delivering vibration/noise reduction, equipment protection, and environmental improvement.

The PET Composite Insulating Barrier Board is a rigid insulating material made by laminating and pressing two or more layers of electrical-grade polyester film with a special heat-resistant adhesive. It relies entirely on the composite structure of multiple PET film layers to provide the required mechanical strength and electrical insulation performance.The product features a smooth and dense surface, is specifically designed for dry-type transformers and is particularly suitable for use as the main insulation between high-voltage and low-voltage coils. It is also widely used in the insulation of high-voltage electrical apparatus and motor windings.

Pultruded strips for dry transformer, also known as I-shaped insulating spacer, are insulating support profiles integrally formed through a continuous pultrusion process. The core is made of alkali-free glass fiber impregnated with thermosetting resin. The I-shaped structure is adapted to the internal installation space and stress requirements of dry-type transformers. The surface is smooth and free of defects such as bubbles and cracks.

Weftless Banding Tape is a B-stage (semi-cured) tape, manufactured by combining chemically treated alkali-free glass fiber yarns, impregnating them with thermosetting resin, such as epoxy resin, and then drying.The term "weftless" means all glass fibers are unidirectionally aligned in parallel. When stretched transversely, the tape forms a mesh-like structure. This unique characteristic allows the tape to fit tightly against the surface of the object being bandaged during winding. After curing, it forms a high-strength, low-shrinkage insulating binding layer.

Transformer Shrink Tape is a professional heat-shrinkable sealing tape constructed from polyester fiber; engineered for reliable insulation and sealing in harsh environments. Unlike conventional adhesive-based electrical tapes, it uniformly shrinks when heated, creating a tight physical wrap around irregular shapes and complex components for a seamless, permanent seal. With excellent resistance to moisture, chemicals, and mechanical stress, it is the ideal choice for mission-critical installations where reliability is essential.

Insulators are key components that perform the dual functions of electrical isolation and mechanical support, serving as one of the core foundational elements ensuring safe equipment operation. Through specific structural designs, they achieve "electrical isolation between live parts and grounded/low-potential parts" while withstanding the mechanical and thermal stresses generated during equipment operation.

Electrical laminated wood is an insulating structural material specifically designed for power equipment such as transformers and instrument transformers. It is manufactured from high-quality birch wood through processes including steaming, rotary cutting, and drying to produce veneers, which are then coated with insulating adhesive and bonded under high temperature and high pressure.

Insulating Crepe Paper is a key solid insulating material in the oil-immersed transformers. Made from high-purity sulfate wood pulp, the product is produced by a special creping process using un-dried flat web base paper. Its unique transverse crepe structure delivers high elongation and good flexibility—unmatched by plain insulating paper—allowing it to tightly conform to irregular surfaces. This ensures a uniform, compact insulation layer on complex areas such as transformer leads, transposed conductors, and coil ends.

FRP fasteners for transformers are made of glass fiber reinforced plastic, combining high strength with excellent electrical insulation. They are corrosion-resistant and non-conductive, specially used for insulating structural connections in power equipment such as transformers and reactors. Suitable for both oil-immersed and dry-type transformers, they are key components ensuring electrical safety and structural stability.