Electrical Pressboard Presspaper for Oil-Immersed Transformers - China Manufacturers, Suppliers, Factory
Our Premium Electrical Pressboard (Pre-compressed Paperboard) is manufactured from 100% high-purity unbleached sulfate wood pulp. Engineered specifically for high-voltage and ultra-high-voltage power transformers, this insulation board features an exceptionally dense structure, high chemical purity, and excellent dimensional stability.
It offers superb compatibility and high absorption with transformer oil, making it an indispensable core insulation material for modern electrical grid equipment.
Key Features & Advantages
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Superior Dielectric Strength: High electric strength in transformer oil ensures reliable insulation between high-voltage and low-voltage windings.
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Exceptional Mechanical & Tensile Strength: High tensile strength and elongation allow the material to withstand intense electro-dynamic forces and mechanical stress during short circuits.
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Low Compressibility & High Resistance to Bending: Exceptional dimensional stability under high pressure ensures the clamping system of the transformer remains secure over decades of operation.
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100% Pure Cellulose: Made without any bonding agents or chemical additives, ensuring zero contamination of the transformer oil and a neutral pH value.
| Property / Parameter | Specification Value |
| Material Composition | 100% Unbleached Sulfate Wood Pulp |
| Density Range | 1-1.3g/cm3 |
| Thickness Range | 1-10mm |
| Moisture Content | ≤6% |
| Ash Content | 1% |
| Conductivity of Aqueous Extract | 5-10% |
| Application Environment | Oil-immersed Transformers & Reactors |
Custom CNC Machining & Fabrication Services
We provide fully customized, high-precision CNC machining based on your engineering drawings (CAD/DXF). Our advanced fabrication capabilities include:
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Insulation Oil Ducts & Spacers (Corrugated or flat oil duct assemblies)
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Insulating Strips & Blocks (Rectangular, stepped, or custom profiles)
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Insulation Cylinders (Formed or wrapped cylinders for winding cores)
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Custom Machined Components (Clamping rings, segments, and engineered shapes)
🔔 OEM/ODM Support: All dimensions, thicknesses, and shapes can be tailor-made to match your specific transformer design requirements. Contact our engineering team for a quick quote!
Core Applications
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Winding Insulation Barriers: Used to divide the gap oil ducts between high-voltage (HV) and low-voltage (LV) windings, providing reliable primary phase-to-phase and phase-to-ground insulation.
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Coil End Insulation: Deployed in the critical coil end regions to optimize electric field distribution and significantly increase the dielectric breakdown strength of the transformer oil.
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Structural Support: Serves as the heavy-duty structural skeleton within the transformer core and winding assembly.