Permawood® (Lignostone®)



Permawood® (also known as Lignostone®)
is a laminated densified wood according to the
DIN 7707 and IEC 61061 standards. It consists
of beech veneers which are joined together
using synthetic resins that harden under
pressure and heat. 

Permawood® is characterised by the following

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


Permawood® consists of the renewable rescource
beech wood

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
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.

© 2011 Röchling Permali Composites S.A.S.