This study was carried out in order to investigate the retention of chemicals inside the split muli ( Melocanna baccifera ) bamboo after preservative treatment by soaking process. Treatment with 10% aqueous solution of CCB (copper-chrome-boron) was applied in split bamboo of two sizes (1/4 part and 1/8 part) at three different moisture contents and five time periods (24, 48, 72, 96, 120 hours). It was found that maximum retention was found in split bamboo both ¼ part and 1/8 part at 15% moisture content. Due to more exposed area 1/8 part split bamboo attained more chemicals than ¼ part split. It was found that after 72 hours soaking the retention of the chemicals were 8.82 Kg /m3 and 11.46 Kg/M3 for ¼ and 1/8 split bamboo respectively which is sufficient to protect split bamboo in outdoor condition.

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