Abstract
Japan cuts down much tropical lumber, and it is being used for building, and takes criticism from the international society. This research is related to the effective use of the coconut tree material which is waste in the tropics. A coconut tree isn't suitable for the one for building. A reason is in the difference in specific gravity of the lumber. It is because the bottom of the lumber is heavy and the top is the light benefit and strength becomes unstable. After fruit juice is collected, the fruit of the coconut tree becomes waste. So, high quality charcoal could be made by being carbonized coir dust. The way of manufacturing it and a character are reported.
