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Corrugated boards made from pre-compressed pressboard are used for layer insulation in liquid-filled power and distribution transformers.

High purity, mechanical strength, and oil impregnability make the components optimally adaptable to the electrical field conditions in the transformer. In areas with high field strength, the shape retention and good dielectric properties of these components prove their worth. The excellent mechanical properties of the insulation material provide the required safety in the event of a short circuit.

These insulation components are produced using special processing procedures, which guarantee high compaction and dimensional stability.


  • Corrugated board shape A: PUCARO Elboard® ZF boards
  • Corrugated board shape B: PUCARO Elboard® ZF boards
  • Corrugated board shape C: Figeholm Elboard® HD boards
  • Corrugated board shape G: PUCARO TT/RO/HD rolls
  • Corrugated board shape I: Figeholm Elboard® HD boards
  • Corrugated board shape K: Figeholm Elboard® HD boards

Why Hitachi Energy?

  • More than 150 years of experience in insulation
  • Material excellence
  • Advanced technology to scan the quality of pressboard
  • Approved supplier to major utilities worldwide
  • Global footprint

Product scope

  • Power and distribution transformers
  • Insulation class A 105°C according to VDE 0530 Part 1
  • 100% sulfate pulp
  • Natural colored
  • Precompressed pressboard, even fiber orientation, hard and dimensionally stable
  • High purity and mechanical strength
  • Low shrinkage and compressibility
  • Good compatibility with liquid dielectricity
  • Compliant with IEC 641-1

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