Tung oil

Tung oil

Names
IUPAC name tung oil
Other names China wood oil; lumbang oil; tung oil; tungmeal; tungoel
Identifiers
CAS Number	8001-20-5 Y
ChemSpider	none
ECHA InfoCard	100.029.338
EC Number	232-272-3
UNII	3C8NM3A2P0 Y
CompTox Dashboard (EPA)	DTXSID7029291
Properties
Density	0.937 g/ml at 25°C
Refractive index (nD)	1.52 (20°C)
Hazards
Flash point	>110°C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tung oil or China wood oil is a drying oil obtained by pressing the seed from the nut of the tung tree (Vernicia fordii). Tung oil hardens upon exposure to air (through polymerization), and the resulting coating is transparent and has a deep, almost wet look. Used mostly for finishing and protecting wood, after numerous coats, the finish can even look plastic-like. Related drying oils include linseed, safflower, poppy, and soybean oils.^[1] Raw tung oil tends to dry to a fine, wrinkled finish (the English name for this is gas checking^{[citation needed]}); this property was used to make wrinkle finishes, usually by adding excess cobalt drier. To prevent wrinkling, the oil is heated to gas-proof it (also known as "boiled").

"Tung oil finish" 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.^[2]