Oak Board Electrical Insulation Pressboard

Electrical insulation boards are high-purity insulating materials made from long-fiber softwood pulp, processed into a uniform fiber structure without the use of additional binding agents. Thanks to their excellent chemical purity and superior mechanical strength, these boards are widely used as insulation materials in motors, capacitors, and oil-filled power transformers.
The material consists of 100% wood or cotton cellulose with high density and outstanding dielectric performance.

Key Features of Electrical Insulation Boards

• Class A Insulation (105°C rating)
  Suitable for transformer and electrical equipment operating environments requiring stable thermal performance.

• Hot-pressed board made from 100% sulfate wood pulp
  Ensures high rigidity and durability while maintaining excellent electrical insulation.

• High hardness & mechanical strength
  Capable of withstanding mechanical stress in transformer winding insulation and structural support applications.

• Low shrinkage & excellent dimensional stability
  Ensures reliable performance under varying thermal and electrical conditions.

• High chemical purity
  Ideal for use inside oil-immersed transformers and compatible with various liquid dielectrics.

• Excellent processing capability
  The board can be easily punched, folded, cut, machined, or molded, allowing flexible fabrication for transformer accessories and insulation components.

Available Sizes & Customization

• Sheet Size:

  • 1150 × 800 mm

  • 1000 × 2000 mm

• Thickness Range: 0.3 mm – 4 mm (custom thickness available)

• Customization:
  Shapes, dimensions, density, and insulation properties can be customized according to transformer design requirements.

Typical Applications

• Oil-immersed power transformers

• Dry-type transformers

• Motors and generators

• Capacitors

• Electrical switchgear and insulation parts

• Transformer accessories such as spacers, barriers, cylinders, pads, insulation rings, etc.