H.S. CODE : 15154000 CAS no. 8001-20-5 Tung Oil is pressed from the nuts of Tung tree is known also as China wood oil and nut oil. Major producing countries are mainland China and South America ( Argentina and Paraguay) , United States and Africa . Tung tree farms in the southern U. S. and Argentina now supply tung oil, formerly available only from China. The oil is still known in some circles as " China wood oil" . Tung oil is an ideal " binder" or " vehicle" , carrying the resins and driers deep into the pores of the wood so that sealer and finish coats practically become part of the wood - drying into an armor-like yet beautiful surface. Tung oil tree ( Aleurites fordii) , a deciduous shade tree native to China. It belongs to the Euphorbia Family ( Euphorbiaceae) along with the candlenut tree ( A molucanna) , another species with seeds rich in unsaturated oils. For centuries tung oil has been used for paints and waterproof coatings, and as a component of caulk and mortar. It is an ingredient in ink and is commonly used for a lustrous finish on wood. Some woodworkers consider tung oil to be one of the best natural finishes for wood. Tung oil is composed primarily of eleostearic ( elaeostearic) acid, with smaller amounts of oleic, linoleic and palmitic glycerides. Eleostearic acid is a crystalline unsaturated fatty acid that exists