3/10/2023 0 Comments Tru oil cure timeIt is considered safe to be used on sculptures made near waterways. It is claimed to be less susceptible to mould than linseed oil. Tung oil resists water better than any other pure oil finish and does not darken noticeably with age. When applied in many fine/thinner coats over wood, tung oil slowly cures to a matte/light satin look with slight golden tint. This thinning vehicle evaporates within 15 to 20 minutes. The oil is often diluted with hydrocarbon thinner so its viscosity is very low and enables the oil to penetrate the finest grain woods. Second, after it cures (5 to 30 days, weather/temperature related), the result is a very hard and easily repaired finish, so it is used on boat decks and now on floors. Tung oil is very popular today because of two properties: first, it is a naturally derived substance. Showing the golden effect of polymerized tung oil versus bare wood They are especially sensitive to autoxidation, which encourages cross linking of neighbouring chains, hence hardening of the base resin. The primary constituent is a fatty acid with a chain of 18 linked carbon atoms or methylene units containing three conjugated double bonds. The fatty acids in tung oil and their concentration are listed in the table.įatty acid composition of tung oil Alpha-eleostearic acid The earliest references for Chinese use of tung oil is in the writings of Confucius around 500 to 400 BC. The word "tung" is etymologically derived from the Chinese 桐 tóng. During the Song Dynasty, tung oil was used for waterproofing on ships. The tung oil tree originates in southern China and was cultivated there for tung oil, but the date of cultivation remains unknown. 'Tung oil' is often used by paint and varnish manufacturers as a generic name for any wood-finishing product that contains the real tung oil or provides a finish that resembles the finish obtained with tung oil. To prevent wrinkling, the oil is heated to gas-proof it (also known as "boiled"). Raw tung oil tends to dry to a fine, wrinkled finish (the English name for this is gas checking) this property was used to make wrinkle finishes, usually by adding excess cobalt drier. Related drying oils include linseed, safflower, poppy, and soybean oils. Used mostly for finishing and protecting wood, after numerous coats, the finish can even look plastic-like. Tung oil hardens upon exposure to air (through polymerization), and the resulting coating is transparent and has a deep, almost wet look. The oil and its use are believed to have originated in ancient China and appear in the writings of Confucius from about 400 BC. Tung oil or China wood oil is a drying oil obtained by pressing the seed from the nut of the tung tree ( Vernicia fordii).
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