DONGNAM PETROLEUM Ind. Co., Ltd. has been growing with the Korean heavy electric machine industry as the largest manufacturer having over 50% market share in Korea of insulating oil, machine oil and wax products, and its been exporting excellent and competitive electrical insulating oil products(765kV) abroad with fulfilling the requirements of international standards. Also DONGNAM PETROLEUM Ind. Co., Ltd. is the leader of a high biodegradable insulating oil technology and manufacturing BIOTRAN-35, vegetable oil products, in the world market as well as the domestic market.