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Title: Preservation characteristics of seven tropical hardwood species from Malaysia
Author: Pendlebury, A. J.
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1990
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Given the overexploitation of indigenous forests and inadequate regeneration programmes in Peninsular Malaysia there is concern about the long term availability of both export grade timber species and low grade timber for domestic consumption. Therefore heartwood samples from seven species with commercial potential, (kapur (Dryobalanops aromatica Gaertn. f); kempas (Koompassia malaccensis Maing. ex Benth); keruing (Dipterocarpus spp.); mersawa (Anisoptera spp.); punah (Tetramerista glabra Miq.); rubberwood (Hevea brasiliensis Muell.-Arg) and simpoh (Dillenia spp.)) but about which there exists little objective information were evaluated in terms of their preservation characteristics. The species' inherent structural limitations to impregnation were water-borne copper-chrome-arsenic (CCA) preservatives were identified through the use of both optical and scanning electron microscopy. Samples of each species were evaluated for their amenability to fluid impregnation through the use of a novel technique which allowed for the direct and continuous measurement and observation of fluid uptake throughout a controlled vacuum-pressure treatment cycle. The technique provided quantitative data on species amenability to impregnation and also allowed for the determination of optimum process duration. The evaluation of preservative active ingredient distribution in treated samples was determined qualitatively through the use of colorimetric reagents and scanning electron microscopy energy dispersive X-ray microanalysis and quantitatively through the use of X-ray fluorescence spectrophotometric analysis. These studies highlighted preservative distribution problems in several of the species examined most notably kapur, kempas, rubberwood and mersawa.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available