On the other hand, increasing the ratios of either KS or KC particles
in the middle layer of the samples decreased their stabilities.
Nonetheless, these values were significantly higher than those of
Type 7 panels. This can be ascribed to the presence of kenaf bast
particles in the Type 7 panels. In a previous study [22], kenaf bast
was reported to be having low wettability. This could have contributed
to the low water absorption of the Type 7 panels. However,
swelling and water absorption of the sample were relatively high
in Type 8 panels, which can be due to the massive amount of KC
employed in manufacturing the board owing to the low density
of KC. Accordingly, when the samples were submerged in water,
low-density wood and a high absorbant material such as KC might
have increased the TS and WU of the boards since kenaf required
large volume of particles to equate the mass and achieve the targeted
board density [21,23]. Furthermore, once immersed in water,
the UF resin, which is designed for interior applications, is not
durable under outdoor exposure conditions.
On the other hand, increasing the ratios of either KS or KC particlesin the middle layer of the samples decreased their stabilities.Nonetheless, these values were significantly higher than those ofType 7 panels. This can be ascribed to the presence of kenaf bastparticles in the Type 7 panels. In a previous study [22], kenaf bastwas reported to be having low wettability. This could have contributedto the low water absorption of the Type 7 panels. However,swelling and water absorption of the sample were relatively highin Type 8 panels, which can be due to the massive amount of KCemployed in manufacturing the board owing to the low densityof KC. Accordingly, when the samples were submerged in water,low-density wood and a high absorbant material such as KC mighthave increased the TS and WU of the boards since kenaf requiredlarge volume of particles to equate the mass and achieve the targetedboard density [21,23]. Furthermore, once immersed in water,the UF resin, which is designed for interior applications, is notdurable under outdoor exposure conditions.
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