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Materials 51
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when compared to panels only composed by the low-density As for the classifcation, the panels T2, T3, T4, and T5
Cedrelinga cateniformis species. can be classifed as type OSB/1 (non-structural for general
As observed by Lunguleasa et al., the water absorption of and interior use); T3 and T5 also fall under the OSB/2
OSB panels manufactured in the laboratory using softwood classifcation (load-bearing panels, used in dry conditions)
mixtures (fr, spruce and pine) was superior to panels made according to EN 300.
of fast-growing hardwood mixtures (poplar, willow and birch). The panels made using wood mixtures demonstrate

Regarding swelling in thickness after 24 hours, the OSB mechanical resistance that is comparable to those made
composed only of pine strands showed the highest mean entirely of pine strands.
swelling value, and the panels that contained some percentage This fnding proves to be advantageous as it opens up the
of wood mixtures showed the lowest value of swelling in possibility of using Amazonian wood mixtures as an alternative
thickness. raw material with similar characteristics to pine wood. This is
Zhuang et al., when studying the physical and mechanical particularly helpful during times when pine wood is scarce or
properties of OSB panels with mixtures made from eastern expensive in the industry, especially in Brazil where the paper
Canadian softwood species, observed that panels with wood and cellulose industry is the largest consumer of pine wood.
mixtures showed less swelling in thickness than panels As for MOR in the parallel direction, it is noted that

composed 100 percent of balsam fr particles. the values found for all the panels were higher than the
When comparing the swelling in thickness to the compaction limits established by the EN 300 standard. However, in the
ratio, it is noted that T4 presented the highest compaction perpendicular MOR, all OSB panels reached the minimum
ratio, however, it was not the highest swelling value after 24 values for the classifcation OSB/1, OSB/2, and OSB/3, except
hours of immersion. for OSB/4, where T3 and T5 presented compatible values for
Iwakiri et al. also found a lower thickness swelling in the such classifcation.
OSB panel that presented the highest compression ratio Iwakiri et al. obtained results for the parallel and perpendicular

among the others adopted by them. These results differ modulus of rupture of 38.79 and 23.29 MPa, respectively, for
from what is mentioned by Kelly, who states that the greater OSB panels produced using a mix of species.
the compression rate of the panel, the greater its thickness Cabral et al., when producing OSB panels using pine
swelling due to the greater release of compression tension and eucalyptus mixtures, obtained values of 30.69 and 22.32
that is retained in these panels before immersion in water.
Considering the longer immersion time, the thickness
swelling is partially inherent to the wood and also due to the Rizbelle
adsorption of water by the hydroxyl groups, which are present
in the chemical components of the cellulosic wall.

Regarding non-return rate in thickness (NRRT), T1t showed
a higher average value than the OSB-composed wood mixture
with 40 percent pine strands. Gorski et al. obtained a non-
return rate in thickness of 32.01 percent in OSB panels made
from mixtures of Pinus spp. and Eucalyptus benthamii. The
results obtained in this study were lower than those found
by the aforementioned authors.