Pre-Compressed Pressboard
High-density pressboard for critical transformer insulation and load-bearing applications
Overview
Pre-compressed pressboard is a high-density insulation material produced by compressing cellulose-based pressboard under controlled pressure and temperature conditions. This process significantly improves dimensional stability, mechanical strength, and resistance to shrinkage.
This material is specifically intended for demanding transformer applications where standard pressboard may not meet mechanical or long-term stability requirements. It is commonly used in large power transformers and high-voltage insulation systems.
Due to its higher density, pre-compressed pressboard offers superior resistance to mechanical stresses caused by short-circuit forces while maintaining excellent dielectric properties after oil impregnation.
It is suitable for thick sections, load-bearing insulation parts, and machined transformer components.
Technical Specifications
| Specification | Value |
|---|---|
| Base Material | Pre-compressed high-purity cellulose fibres |
| Thickness Range | 3 mm – 75 mm |
| Density | 1.3 – 1.4 g/cm³ |
| Dielectric Strength (in oil) | ≥ 18 kV/mm |
| Operating Temperature Class | Class A – 105°C |
| Dimensional Stability | Very high (low shrinkage) |
| Mechanical Strength | High, suitable for load-bearing insulation |
| Oil Compatibility | Excellent (mineral transformer oil) |
| Supply Form | Sheets, blocks, machined parts |
| Fabrication Options | CNC machining, milling, drilling |
Applications
- High-voltage and extra-high-voltage power transformers
- Main insulation barriers and spacers
- Load-bearing structural insulation components
- Transformer cylinders, rings, and support blocks
- Insulation components exposed to high mechanical stress
Why Choose This Product
Superior dimensional stability compared to standard pressboard
High resistance to mechanical stresses during short circuits
Reduced shrinkage during transformer service life
Improved reliability in critical insulation zones
Ideal for thick and precision-machined components
Need Custom Specifications?
Our engineering team can customize this product to your exact requirements. Get in touch for a detailed quote.
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