tung oil

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tung oil,

oil obtained from the seeds of a tropical tree, the tung tree (Aleurites fordii) of the spurgespurge
, common name for members of the Euphorbiaceae, a family of herbs, shrubs, and trees of greatly varied structure and almost cosmopolitan distribution, although most species are tropical. In the United States the family is most common in the Southeast.
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 family, and from seeds of some related species, all from Indomalesia or W Pacifica. It is known also as China wood oil and nut oil. The poisonous seeds found in the heart of the tung fruit (which is the size of a small apple) contain more than 50% tung oil, readily obtained when the seeds are heated, ground, and pressed. The oil is amber-colored and contains a high proportion of eleostearic acid. Because of its wide use as a dryer in varnishes and paints, it has great commercial importance. While the bulk of the product is utilized by the paint and varnish industry, tung oil has additional uses, e.g., as a component of insulating compounds and in the manufacture of linoleum and oilcloth. China was long the chief producer of the oil, but the tree has been introduced in other areas as well. The U.S. Dept. of Agriculture experimented with tung tree growing early in the 20th cent., and afterward encouraged Southern farmers to cultivate it. In recent years, an increasing portion of the commercial supply has been obtained from trees grown in the United States, particularly in the South.

Tung Oil


(also wood oil or China wood oil), a fatty vegetable oil obtained from the seeds of the tung tree (Aleurites cordata). Tung oil constitutes as much as 70 percent of the weight of the seeds. A viscous and pungent yellowish fluid, tung oil dries rapidly in air and is soluble in most organic solvents. It has a density of 0.933–0.945 g/cu cm and a refractive index of 1.51–1.52. The saponification number is 188–197, and the iodine number is 154–176. Tung oil is composed of unsaturated acids (66–82 percent eleostearic acid, 4–13 percent oleic acid, and 9–11 percent linolenic acid), saturated acids (about 2.5 percent stearic acid and 3.7 percent palmitic acid), and unsaponifiable substances (0.4–1 percent). Such large quantities of eleostearic acid are found only in tung oil. The principal use of the oil is in the manufacture of paints and varnishes. Tung oil is mildly toxic.

tung oil

[′təŋ ‚ȯil]
A yellow, combustible drying oil extracted from the seed of the tung tree; soluble in ether, chloroform, carbon disulfide, and oils; used in formulations for paints, varnishes, varnish driers, paper waterproofing, and linoleum. Also known as China wood oil.

tung oil

A drying oil which oxidizes very rapidly, at almost twice the rate of linseed oil; forms a hard dry film when used in paints and varnishes; although “China wood oil” and “wood oil” sometimes are used as synonyms, tung oil never is extracted from wood.
References in periodicals archive ?
tung oil industry had nearly 10 million trees in production--with mills strategically located across the Gulf Coast that specialized in extracting oil from the seed and processing it further for use, including to coat ammunition during World War II.
With gum rosin in short supply and the rising price of Chinese tung oil, known for its performance attributes, followed by increasing costs of rosin ester resins, all of these increases make it very difficult for varnish manufacturers to hold their prices down.
The only sample where the blistering recovered was for the tung oil SPE-alkyd which also had the largest blisters (size 5) after initial removal from the humidity cabinet.
The TO and the alcoholized tung oil were characterized by [.
The treatments included tung oil impregnation, phenol-formaldehyde impregnation, and acetylation with acetic anhydride.
As a result, the polymerization products from tung oil are highly resistant to water and alkalis, and it dries so rapidly that often a highly wrinkled surface is developed in a short amount of time.
Amid fluctuating prices and quality, such imports supply most of the 1 million pounds of tung oil now used in U.
Although any oil can break down by alcoholysis, which increases the OH value, tung oil, with multiple carbon-carbon double bonds, can also be modified by hydroxylation increasing even more the OH concentration in the product.
Brush a coat of tung oil onto a teak chair and it quickly becomes one with the wood.
In Experiment #2, only the "A" microcapsules with camphor and red dye, and "M" microcapsules with Tung oil were used.
Guegan compared a standard oil finished coating for wood based on linseed or tung oil which requires several days to dry, with a UV-curing system that could be dried in seconds.