Abstract

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Knifes incising were used as a pretreatment technique in increasing the Copper-Chromium-Arsenic (CCA) uptake and retention of two timber species of Mata Ulat (Kokoona spp). and Kulim (Scodocarpus borneensis). These timbers are difficult to  treat with preservatives. The average chemical uptake of these timbers is below 80 l/m³. Wood samples of 4 cm x 10 cm x 210 cm were used in this study.  They were first kiln dried to 20% moisture content, then incised prior to treatment with 8% (CCA) preservative solution using full cell processes at 200 psi for 2 hours. The effectiveness of the incising technique was evaluated by comparing the CCA retention of the incised samples with that of the control without incising. The response of these timbers towards incising technique showed an improvement in absorption and penetration, where the improvement in preservatives uptake for Kokoona spp. was 24 % and for Scodocarpus borneens is 75%.

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