High-Density Electrical Insulation Pressboard | 100% Pure Kraft Pulp Transformer Presspan Sheet - STK
STK's High-Density Electrical Insulation Pressboard (globally recognized as Presspan or Prephan) is a premium, heavy-duty rigid dielectric material manufactured from 100% unbleached sulfate chemical wood pulp. Highly calendered under massive hydraulic pressure, this paperboard balances extreme mechanical toughness with elite chemical purity.
Unlike cheap industrial boards mixed with recycled fillers that soften or leach chemicals, our electrical pressboard acts like a rigid, oil-friendly armor plates. It forms the permanent structural backbone inside power grids, delivering unyielding mechanical support while blocking tens of thousands of volts cleanly without degrading.
Product Features
High Dielectric Strength
Manufactured from high-purity cellulose to provide excellent electrical insulation for transformers, switchgear, and other high-voltage equipment.
Outstanding Mechanical Stability
High-density construction offers excellent compressive strength and dimensional stability, maintaining insulation integrity under long-term mechanical loads.
Excellent Oil Compatibility
Designed for oil-immersed electrical equipment, allowing efficient oil impregnation while maintaining stable dielectric performance throughout its service life.
Easy Machining & Fabrication
Suitable for cutting, drilling, milling, punching, and CNC machining into customized insulation components for transformer manufacturing.
Long-Term Reliability
Free from fillers and impurities, ensuring excellent thermal aging resistance and dependable insulation performance in demanding electrical environments.
Product Applications
Dry-Type Transformer Barriers:
Serving as rigid, high-voltage separation plates between low-voltage and high-voltage wire groupings.
Electric Motor & Generator Linings:
Providing heavy-duty slot structural wedges, phase insulation sheets, and end-winding supports inside massive industrial motors.
High-Voltage Switchgear Shields:
Serving as robust arc-chute barriers and partition panels inside power substation control cabinets and circuit breakers.
STK Precision Custom Processing Services
Custom Form Factor Slicing: Do you need massive jumbo master plates (such as 1x2 meters or 2x3 meters) for large transformer frames, or pre-cut small strips for slot insulation? Our heavy-duty cutting lines deliver perfectly straight borders.
Advanced CNC & Die-Cut Components: We don't just sell raw boards. We can CNC-mill, route, stamp, and pre-shape pressboard into customized oil-flow rings, gear panels, notched spacers, or specialized washers matching your CAD blueprints perfectly.
Moisture-Locked Wholesale Packaging: Wood fibers naturally drink in atmospheric humidity. To keep your stock bone-dry before use, we pack all bulk shipments inside heavy-duty moisture-barrier plastic shrink-wrapping on reinforced export pallets.
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