Buildings 2025 , 15 , 1702
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3. Results and Discussion 3.1. Assessment of Accelerated UV Weathering
Digital images of the exposed surfaces revealed significant color changes in all tested OSB samples (Figure 2). These changes, caused by accelerated climatic exposure, are primarily attributed to the photodegradation of lignin in the wood [35], as lignin is among the first cell wall polymers to degrade under UV radiation [36]. The results presented in Table 2 indicate that the samples produced with green adhesives, OSB-1 and OSB-2, exhibited 27% and 46% lower susceptibility to color change compared to the OSB-C sample, respectively. These results are consistent with the study by Núñez-Decap et al. [14], who used the same green adhesives and obtained similar findings.
Figure2. Color change results in the OSB-C, OSB-1, and OSB-2 samples.
Table2. Color change in OSB samples due to artificial weathering.
Δ EAverage
OSB Sample ID
Mean 6.08 c 4.44 b 3.29 a
St. Dev.
OSB-C OSB-1
1.51 0.99
OSB-2 0.79 a, b and c correspond to homogeneous groups from a multiple range test, through the method 95% LSD, which are statistically different from each other. The results provide a good indication of the durability of OSB boards, as durability against external agents, such as UV radiation exposure, is a key characteristic sought in board manufacturing. According to the results, it could be inferred that the green adhesives in this case also functioned as a barrier against UV radiation, which could help improve the long-term performance of OSB boards under various environmental conditions [37]. 3.2. Physical Properties Table 3 presents the results for the physical properties: density, moisture content, and thickness swelling.
Table3. Results of physical properties of the OSB samples.
Thickness Swelling (%)
OSB Sample ID
Density (kg/m 3 )
Moisture Content (%)
24h
48h
Mean St. Dev.
Mean St. Dev.
Mean St. Dev.
Mean St. Dev.
2 a 2 a 5 b
32.07 a 32.04 a 31.22 a
33.97 a 33.31 a 33.70 a
OSB-C 822 b
101.85 102.40
0.45 0.50 0.99
7.28 4.51 2.79
7.40 5.12
705 a 748 ab
OSB-1 OSB-2
106.92 2.56 a and b correspond to homogeneous groups from a multiple range test, through the method 95% LSD, which are statistically different from each other.
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