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Press paper is a special product based on the purest cellulose, extracted from long-fibered coniferous trees. These are formed into a non-woven material without using any additional binding agents and then pressed.

Hitachi Energy offers PUCARO press paper with high chemical purity, which is an exceptionally suitable insulation material for electrical machines (impregnated with resin), capacitors (impregnated with oil or resin), and particularly oil-filled transformers. The material properties allow classification in insulation class A (105 °C) and are manufactured in accordance with the IEC 60085 standard.

Depending on the thickness of the material, a distinction is made between PUCARO press paper in rolls and board material.


Product scope

  • Layer insulation in a liquid-filled transformer
  • Insulation class A (105 °C) according to IEC 60085
  • 100% sulfate wood pulp
  • Natural colored
  • High purity and oil absorption
  • Special PUCARO press paper:
    • From thicknesses: 0.15 mm - 1.0 mm
    • In rolls: 640 mm or 1,280 mm
    • In strips: minimum 4 mm width
    • In sheets: 640 x 800 mm or 800 x 1,280 mm
  • PUCARO transformer press paper
    • In rolls: 660 mm or 1,320 mm
    • In strips: minimum 4 mm width
    • In sheets: 660 x 800 mm or 800 x 1,320 mm


Why Hitachi Energy

  • More than 150 years of experience in insulation
  • Complete range of insulation products for liquid-filled transformers; comprehensive range for dry-type
  • Material excellence
  • Global footprint
PUCARO presspaper in rolls

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