Lignostone® Transformerwood® - for transformers

Under the brand name Lignostone® Transformerwood® we offer you a laminated densified wood according to IEC 61061 for the construction of transformers that consists of beech veneers (Fagus sylvatica), which are joined together with thermosetting synthetic resins under pressure and heat. Lignostone® Transformerwood® has the following properties:

  • good electrical insulation
  • very good oil absorption
  • low specific weight
  • withstands high mechanical loading
  • low- and high-temperature resistance
  • resistance to abrasion and wear



  • Lignostone® L I/2 E3
  • Lignostone® M I/2 E3
  • Lignostone® L II/2 E3
  • Lignostone® M II/2 E3
  • Lignostone® L X/2 E3
  • Lignostone® M X/2 E3

Veneer quality

  • SQ = Standard quality - Fulfills the requirements of IEC 61061
  • HQ = High Quality - Surpasses the requirements of IEC 61061
  • TQ = Top Quality - Surpasses by far the requirements of IEC 61061

Key to identification

The required grade for a specific application is defined by

Densification symbols

L = 0.75 to 1.05 g/cm³
M = 1.10 to 1.25 g/cm³
H = 1.30 to 1.40 g/cm³


I= parallel
II= crosswise
X= tangential

Veneer thickness

1 = veneers < 2 mm
2 = veneers ≥ 2 mm

Type of resin

without character = mechanical types
E3 = electrical types

Example: An example for identification of one of the standard types: LII/2-E3 = Low density – crosswise lamination – with ≥ 2.0 mm veneer – electrical type. We also supply special types for applications with particular requirements.



We offer you our laminated densified wood Lignostone® Transformerwood® as:

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Lignostone® - laminated densified wood
Röchling Industrial