Specific gravity (SG) of wood is a measure of the amount of structural material a tree species allocates to support and strength. Specific Gravity of wooden sample is taken by using the ratio of oven-dried weight of the sample to its volume at 12% moisture content. Rubber wood is a moderately heavy wood which can be used efficiently as a boat building material if proper preservative procedure can be carried out. Due to its refractory behaviour it can easily take up preservative solutions. In this present study Cashewnut Shell Liquid and Copper based wood preservative (Nano Copper Oxide) were used. Specific Gravity of different treated wooden panels was carried out. The main objective of the present study is to assess the changes in the specific gravity in the wooden panels treated with different preservative solutions.

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