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mean modulus of elasticity and a higher IB. This was most likely due to its density that was 130 kg/m 3 higher than that of OSB. The production of MFP boards requires more, but cheaper wood and may use lower quality wood material for the small chips necessary for MFP production. Table 4. Fines Distribution Fines Screen Size Dimensions AA BB CC DD EE (mm x mm) x (%) X x (%) X x (%) X x (%) X x (%) X > 6.3 0 0 5.23 19.1 5.54 12.1 85.21 1.20 90.52 1.18 > 5 0 0 1.76 27.3 6.09 15.2 0.52 38.6 1.34 37.2 > 4 0 0 1.96 21.29 5.80 14.1 0.75 30.1 0.97 41.7 > 2.5 0.25 40.21 25.16 3.21 40.62 3.21 5.32 16.7 3.61 5.50 > 1 51.24 2.37 55.55 4.29 39.63 2.89 2.46 7.22 3.56 8.54 > 0.5 20.13 3.17 5.42 24.2 1.92 21.1 2.45 17.0 0 0 <0.5 28.38 3.27 4.97 27.1 0.40 21.0 2.09 27.1 0.42 27.1 Considering the parameters for modulus of rigidity, all laboratory boards fell into the category of OSB/3 (Table 5). Table 5. Mechanical Properties of the Boards and the Results of HSD Test for Homogeneous Groups Type of Board MOR II MOR A MOE II MOE A IB TS MPa X (%) MPa X MPa X MPa X MPa X % X OSB* 32.5 11.1 14.9 6.6 4940 9.4 2070 6.4 0.64 8.9 5.6 12.7 MFP* 24.6 2.7 21.6 3.8 4430 2.0 3870 1.9 0.80 12.6 8.8 9.2 300** 20 - 10 - 3500 - 1400 - 0.32 - 15 - 312** 16 - 16 - 2400 - 2400 - 0.45 - 10 - AA 14.1 a 6.4 21.0 a 9.1 2120 a 7.0 3030 a 6.3 0.60 a 8.8 13.8 6.1 BB 15.6 a 6.7 22.2 a ,b 5.9 2770 b 7.3 3110 a 6.2 0.65 b 9.7 16.9 7.2 CC 18.4 b 10.9 24.2 b ,c 9.8 3320 c 4.1 3290 a, b 10. 6 0.81 d 16.5 16.6 11.1 DD 27.0 c 9.8 25.2 c 8.7 4380 d 8.3 3390 b,c 8.0 0.71 c 10.6 14.9 7.4 EE 41.0 d 10.8 27.8 d 8.2 6420 e 9.2 3580 c 7.1 0.68 b 10.9 17.3 9.9 * density of dry boards: OSB - 590 kg/m 3 ( X -3.7%), MFP - 720 kg/m 3 ( X -0.51%); ** EN - 310 for OSB/3, EN - 312 for P5 The boards made of fine chips (AA and BB) did not achieve a modulus of elasticity above 3500 N/mm 2 in either of their axes or at least 2400 N/mm 2 in both axes, and, therefore, they should be classified as P3 boards, i . e ., non-load-bearing boards to be used in humid conditions. The CC boards met the requirements for P5 particle boards, DD
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Mirski et al . (2016). “Non - strand chips OSB,” B io R esources 11(4), 8344-8354.
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