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Chemical Composition and Water Repellency Property of Ten Village Wood Species

S. C. Das
Bangladesh Forest Research Institute (BFRI), P.O. Box 273, Chittagong, Bangladesh.

S. Akhter
Bangladesh Forest Research Institute(BFRI), P.O. Box 273, Chittagong, Bangladesh.

M.Sayeed
Bangladesh Forest Research Institute(BFRI), P.O. Box 273, Chittagong, Bangladesh.

Abstract/ Executive Summary:

A study on chemical analysis and water repellency property of ten village wood species was conducted to fnid out the percentages of their chemical components. It was found that raintee possessed the highest amount of water soluble extractives. It was followed by babla, mango and painya mandar, Neem and jack fruit contained the least amount of this kind of extractives. Alcohol-benzene soluble extractives of the species fell in the range of 1.38- 6.60%. The holocellulose content was the highest in tentul (Tamarindus indica). Ghora neem (Melia azadarach) ranked the next in this respect. In consideration to the cellulose content, tentul, ghora neem, sissoo, mango and babla may be suitable for chemical pulping and conversion products. These ten species were explored for water repellency test. Neem was found to absorb the least amount of water. In order of gradation on this aspect sissoo, babla and tentul were found to absorb slightly more water. These species may be suitable both for indoor and outdoor uses. Sorption of water in the remaining six species is considerably higher and consequently they are deemed not suitable for outdoor uses.

Keywords: Chemical Composition, Neem, Wood Species, Jackfruits.

Location:

Start Date: 01-07-1990

End Date: 30-06-1991

Program Area: Variety and Species

Commodity:

Objectives:

To the cellulose content, tentul, ghora neem, sissoo, mango and babla may be suitable for chemical pulping and conversion products.
To fine out the percentages of their chemical components.

Methodology:

The study was conducted with ten village wood species of Bangladesh. They were rain tree, mandar, neem , jack fruit, mango, painya mandar, babla, sissoo, ghora neem and tentul. After the procurement, the species were identified by a wood anatomist. They were received in the disk form. Chips were made from sapwood and heartwood taking approximately equal. portions from both and were allowed to dry in a tray for 7 days in the laboratory. The wood chips were then fed in the laboratory Wiley Mill and powdered. The wood meal passing through the 40 mesh sieve and retained in 60 mesh sieve was collected. Extraneous matter and major components of wood were then determined according to T APPI standards (T-1 m-59, T- 4m-59, T -6m-59, T-9m-54, T-203m-58). Specimen samples of 0.6 cm thick in axial direction, 2 x 2 cm in radial-tangential direction were prepared taking equal portions from both heartwood and sapwood for determining the water repellency and dimensional stability. All the specimens were smoothened with a sand paper before putting them for drying in an oven for 48 hours at 105 ± 2°C. Eight specimens of the above dimensions were prepared, and four of them were subjected to alcohol-benzene extraction. Both extracted and un extracted specimen samples were then dried in an oven for 48 hours at 105 ± 2°C. Both the extracted and un extracted specimens were cooled in a desiccator over calcium chloride. They were then soaked in distilled water in an air-conditioned room. The specimens were taken out of water at intervals of 1,3,5,10,15,30,45,60,90,120 and 1440 minutes, the adhering water was blotted, weighed on an electric balance and measured the tangential dimensions with a set of slide callipers.

Source of Information: Bangladesh Journal of Forest Science Vol. 22 (1 & 2) :61-67, 1993, ISSN-1021-3279.BFRI.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the study of chemical composition and water repellency property of ten village wood species, jack fruit, tentul, neem, ghora neem and sissoo having lesser amount of water soluble extractives are considered suitable for both indoor and outdoor uses. Sissoo, rain tree, painya mandar, ghora neem and jack fruit showing higher amount of alcohol- benzene soluble extractives are likely to possess good polishing, varnishing and painting properties. Tentul, ghora neem, sissoo, babla and mango containing higher amount of holoccllulosc. may be suitable for chemical pulping. Presence of the higher amount of alpha-cellulose in ghora neem, sisoo, tentul, mango and painya mandar make them acceptable for making rayon grade pulp. Neem, tentul, jack fruit, raintree, babla, sissoo arc quite water resistant and as such these species are considered suitable for exterior uses. On the other hand mandar, painya, ghora neem, and mango do not posses water resistance property and swell considerably within a short span of time. Thus these species arc not considered suitable for exterior uses. However, they can find uses for indoor purposes.

Knowledge Management: Journal