Sifat-sifat asas dan kualiti kayu sentang (azadirachta excels a) pada umur yang berbeza.
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Date
2003
Authors
Mustafa, Mohd. Tamizi (bin)
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Abstract
This study attempts to assess the wood basic characteristics such as density,
percentage of extractive content using methanol and petroleum ether extraction
method as well as the ash content and the inorganic elements. The quality of
Sentang (A. excelsa) wood, both tangential and radial surface of sapwood and
heartwood of 8 and 40 year old were studied. In this study the were two main effect
that were given emphasis that is effect on surface wood quality and colour change
after three months exposure. The wood surface quality studied were surface
roughness, abrasive resistance, scanning electron microscope observation and water
contact angle. The density of wood ranges between 454 and 562 kgm-3 for both age
level. The extractive compound obtained using petroleum ether had a lower value as
compared to methanol extraction which had a higher value of 3.00 to 5.33 %. The
higher age level and the heart wood portion showed a higher percentage of extractive.
Ash content of this wood showed no much different irrespective of age. That is
between 1.87 to 2.33 %. Three main inorganic element found were potassium,
calsium and magnesium. Other element in part per million were sodium, cupper, zinc,
manganese, iron and nikel. Colour value for this wood L* (64.01- 74.28), a* (6.50-
11.55):and b* (17.14- 22.32). The colour difference (.!\E) and whiteness (W) from
the original colour changes directly proportional to the duration of exposure. The
longer exposure, the greater is the color changes. The surface roughness of 40 years
old is greater than the 8 years old. The water absorption of younger age wood was
easier than the older wood, so too with sapwood portion when compared to heartwood
portion. The abrasive resistance of older wood was greater than the younger wood.
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The wood quality of 8 years old wood was almost comparable to the characteristic of
40 years old.
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Keywords
Kualiti kayu sentang , (Azadirachta excelsa)