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...Matec web of conferences https doi org matecconf scescm preservation durian timber and coconut with soursop leaf extract sri handayani endah kanti pangestuti ninda adhitya dharma departement civil engineering universitas negeri semarang unnes indonesia abstract grow a lot in the area gunung pati central java threat biodeteoration as tropical is quite high therefore it necessary to take protection measures form for prevention preservatives used this study are natural preservative method was cold soaking variation concentration follows aims figure out how significant weight loss wood s resistance termites based on result examination termite attack obtained by meanwhile showed these following losses table were classified medium classification concentrations while at resistant introduction also known glugu good quality demand increasing that from collection population grows however nowadays very difficult trees growing wildly cultivated one part obtain raw materials tree average density fo...