ArticleCellular Wood Material (hereinafter CWM) middle layer of the Dendrolight® has been
developed in the beginning of this century as a wood material for minimization of internal
stresses, because of the material structure and reduced swelling and shrinking impact to products
in end use application. Some research has been conducted on the physical mechanical and
physical chemical properties of CWM, while dimensional stability has not been well
researched. The goal of this research is to perform an assessment of the CWM shrinkage and
swelling impact on dimensional characteristics of the CWM multilayer composite materials.
CWM swelling pressure in length, width, and height of the material were determined and
compared to the relevant indicators of pine solid wood. The form stability or the impact of
combination of the CWM with some facing materials wood particle board, medium density
fibre board (hereinafter MDF), oriented strand board (hereinafter OSB), pine solid wood, gypsum
plaster board used in wood products was investigated. The hypothesis that swelling pressure of
CWM must be lower than that of pine solid wood was proved, it is 2.3 times lower in the radial
direction and 3.9 times lower in tangential direction compared to pine solid wood. The CWM
samples, manufactured for determining the form stability in wetting conditions deflected in the
height direction by 4%, thus creating deflections also in the seams between separate lamellas of
the CWM. Swelling pressure of the CWM is several times smaller than that of solid wood and
can be further limited by creating complex wood and non-wood composite material panels using
gluing technique
