Insulation Papers
Electrical insulation paper, often referred to as insulating paper or dielectric paper, is a high-purity material chiefly applied in electrical insulation across a wide range of equipment. It is manufactured from cellulose fibres derived from wood pulp or cotton and processed to achieve optimum dielectric strength, flexibility, and dimensional stability.
Our wide range of insulation papers ensures superior dielectric performance for various electrical insulation needs. Our high-quality electrical grade press paper provides excellent insulation and mechanical strength, making it ideal for transformer applications.
Advanced Technical Overview
Electrical insulation papers are fundamental components in the construction of high-voltage equipment. These papers are designed to provide a reliable barrier against electrical discharge while maintaining structural integrity under significant thermal stress. Our insulation papers are characterised by high purity, low ash content, and exceptional compatibility with transformer oils and resins.
The manufacturing process involves advanced refining of cellulose fibres to ensure a uniform distribution, resulting in consistent dielectric strength across the entire surface of the paper.
Features
- Excellent insulators with high dielectric properties — consistent breakdown voltage across the full sheet area
- Superior dielectric strength and breakdown resistance up to 60 kV/mm when oil-impregnated
- Thin and flexible for easy winding and conforming to complex coil geometries
- Moisture resistant for stable performance in varying climates and humid storage environments
- Fire retardant grades available for specialised safety applications
- High tensile and tear strength for high-speed automated winding lines
Applications
- Transformer industries: Layer insulation, lead wrapping, and core insulation in oil-immersed and dry-type transformers.
- Motor and generator winding: Slot insulation and phase separation in AC and DC machines.
- Switchgear and bushings: Capacitance grading and dielectric shielding in HV switchgear.
- Capacitor manufacturing: Used as a primary dielectric spacer in power and film capacitors.
- Cable manufacturing: Conductor wrapping for oil-impregnated paper cables.
- Gasket and heat shielding: In high-temperature electrical appliances and industrial heating equipment.
| Technical Specifications | |
|---|---|
| Thickness Range | 0.025 mm to 12 mm |
| Density | 300 to 1200 kg/m³ (varying by grade) |
| Thermal Conductivity | 0.035 to 0.07 W/mK |
| Dielectric Strength | 15 kV/mm up to 60 kV/mm (impregnated) |
| Moisture Content | < 8% (at 50% relative humidity) |
| Ash Content | < 1.0% (high purity grades) |
Engineering Tools Suite
Calculate exact dielectric safety margins, oil impregnation rates, and material thickness requirements for your transformer design using our interactive tools.
Frequently Asked Questions
Kraft paper is a flat, high-strength insulation paper used for layer insulation in transformers, providing maximum dielectric strength per unit thickness. Crepe paper is mechanically crinkled during manufacturing to provide high elasticity and flexibility, making it ideal for wrapping irregularly shaped components such as transformer leads, terminal connections and coil ends where conformability is required.
Yes, all our electrical grade insulation papers are chemically inert and designed for excellent oil absorption, ensuring maximum dielectric performance in oil-filled transformers. When fully oil-impregnated, dielectric strength increases significantly compared to dry paper values.
Absolutely. We have in-house slitting and rewinding capabilities to provide insulation papers in precise widths and roll diameters according to your production requirements. Custom slit rolls are supplied with consistent tension and smooth, burr-free edges to suit automated winding machines.
