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Lignostone Transformerwood eOver the decades Lignostone® Transformerwood® has proved an indispensable construction and insulating material, particularly for power and distribution transformers and ideal for many other applications. Lignostone® Transformerwood® is a laminated densified wood according to IEC 61061. It consists of red beech veneers, which are joined together with thermosetting synthetic resins under high pressure and heat.

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At a Glance

Available In
Sheet, Rod, Pressure Beams

FM 4910 Listed, UL 94 V-0, RoHS and REACH Compliant, ASTM E-84

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Technical Information

Stock Products Properties Applications Advantages

Stock Products

Sheet 10-300 mm 1300 x 2000 mm or 1500 x 1500 mm Natural
Rod 6-28 mm dia. 2,000 mm Natural
Pressure Beams up to 300 mm up to 5500 mm Natural

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Specific Gravity g/cm^3 DIN 53479 1.1
Oil Absorption % IEC 61061 -15
Mechanical PropertiesUnitsASTMResults
Modulus of elasticity in flexure N/mm^2 ISO 178 10,000
Compressive strength (perpendicular) N/mm^2 ISO 604 210
Compressive strength (parallel N/mm^2 ISO 604 80
Flexural strength (parallel and perpendicular) N/mm^2 ISO 178 130
Tensile strength N/mm^2 ISO 527 90
Thermal PropertiesUnitsASTMResults
Thermal conductivity at 20°C W/mK DIN 52612 ca. 0.22
Operating temperatures continuous °C 105
Temperature limit when drying and oil impregnating °C 130
Electrical PropertiesUnitsASTMResults
Electrical strength at 20°C kV/25mm IEC 60243 60
Electrical strength at 90°C kV/25mm IEC 60243 50
Dielectric loss factor at 50 Hz 20°C tan alpha DIN 53483 0.02


  • Top and bottom coil clamping rings or multi-sectional pressure parts
  • Platforms
  • Pressure beams
  • lead and cleat support
  • Step blocks
  • Shield rings
  • Potential rings
  • Pressure blocks
  • Fasteners


  • Good electrical insulation properties
  • High mechanical strength at low specific density
  • Easy and fast to dry
  • Very good oil absorption
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