|Appearance||colorless (yellowish when impure)|
|CAS number|| 126-73-8 (anhydrous)|
|Molar mass||266.32 g/mol|
|Melting point|| 193K|
(-80 °C; -112 °F)
|Boiling point|| 562K|
(289 °C; 552 °F)
|Crystal structure||FIXME orthorhombic|
|Solubility||1 mL /165 mL of water|
|S0gas, 1 bar||?|
|S0liquid, 1 bar||?|
|Ingestion||"May cause abdominal pain, vomiting. Other symptoms parallel inhalation." |
|Inhalation||"Causes irritation to the respiratory tract. Symptoms may include coughing, shortness of breath. May cause headache. May also mildly affect blood cholinesterase levels, which will affect central nervous system operation." |
|Skin||"Causes irritation to skin. Symptoms include redness, itching, and pain. May be absorbed through the skin with possible systemic effects." |
|Eyes||"Causes irritation, redness, and pain." |
|Flash point||120C (248°F)|
|Extingushing Media||"Water spray, dry chemical, alcohol foam, or carbon dioxide. Water or foam may cause frothing."|
SI units and standard conditions used unless otherwise stated.|
Tributyl phosphate, known commonly as TBP, is an organophosphorus compound with the formula (CH3CH2CH2CH2O)3PO. This colourless, odorless liquid finds some applications as an extractant and a plasticizer. It is an ester of orthophosphoric acid with n-butanol.
As it has no odour, it finds use as anti-foaming agent in detergent solutions, and in various emulsions, paints, and adhesives. It is also found as a defoamer in ethylene glycol-borax antifreze solutions. In oil-based lubricants addition of TBP increases the oil film strength. It is used also in mercerizing liquids, where it improves their wetting properties. It is also used as a heat exchange medium. TBP is used in some consumer products such as herbicides and water thinned paints and tinting bases.
The shipment of 20 tons of tributyl phosphate to North Korea from China in 2002, coinciding with the resumption of activity at Yongbyon Nuclear Scientific Research Center, was seen by the United States and the International Atomic Energy Agency as cause for concern; that amount was considered sufficient to extract enough material for perhaps three to five potential nuclear weapons.