MATERIAL AND METHOD 1 Materials and equipment

Bogor, 21-22 October 2015 379 This study proposes an approach of improving wood performance through imposing wood extractive into the wood structure. Extractives were obtained by dissolving teak sawdust in hot methanol. The extractive liquid was then impregnated into fast grown teak and rubber wood samples. The treated and untreated samples were assessed through physical, mechanical and biological tests. 2. MATERIAL AND METHOD 2.1 Materials and equipment Six-year-old trees of the fast grown teak Tectona grandis Linn. F and 30-year-old rubber tree Hevea brasiliensis Muel. Arg. were cut into various physical, mechanical and biological testing samples. Wood sawdust was collected from sawmilling of 60-year old traditional teak trunks in Perum Perhutani, Cepu. Technical grade methanol was used in sawdust extraction. Research equipment used in this study consisted of hammermill, oven, electric balance, extraction apparatus, water bath, vacuum-press vessel, swellometer, beakerglass and digital calliper. 2.2 Methods 2.2.1 Sawdust extraction Teak sawdust was oven dried at 65 o C to reach moisture content of 10 prior to extraction. Dried sawdust was divided into three groups, one group as control, one group was ground into 100 mesh wood powder and the remaining was ground into 200 mesh powder. Preliminary extractions were worked out by putting 100 grams wood powder from each group into 2000-ml beaker glass, then added with 750 ml technical grade methanol prior to heating at 70 o C for 30 and 60 minutes extraction periods. The most effective extraction process will be selected for the following extraction works.

2.2.2 Impregnation

All pre-weighed wood samples were loaded into the vacuum-pressure vessel Figure 1. The vessel was then covered and locked tightly prior to vacuum for 15 minutes. Extractive solution was then slowly pumped into the vessel until reaching pressure of 12 kgcm 2 and kept for one hour. After period completion, the wood samples were removed from vessel and reweighed to measure solution retention. Samples were then placed several days in an oven ± 65 o C to reach moisture content of 10. Dried samples were again weighed to determine their weight gains. Figure 1: Vacuum-pressure vessel 2.2.3 Measurements and analysis Wood extractive characterization was determined using GCMS procedure. Dimensional changes on wood samples were measured using digital calliper. Sample weight gains due to Bogor, 21-22 October 2015 380 treatment were identified through weight measurements using an electric balance. All tangential and radial swelling tests were carried out using a swellometer with dial readings recorded at six sequence immersion periods from 5 minutes to 24 hours, as described in Balfas 2007. Parallel and perpendicular compression strengths were determined according to the modified ASTM standard Karnasudirdja, Sofyan Kusumodiwiryo, 1974. Biological wood testing against dry-wood termites Cryptotermes curvignathus was conducted in accord with the Indonesian standard BSN, 2006.

3. RESULT AND DISCUSSION