Triethyl phosphate

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Triethyl phosphate[1]
Skeletal formula of triethyl phosphate
Ball-and-stick model of triethyl phosphate
IUPAC name
Triethyl phosphate
Other names
Triethylphosphate; Tris(ethyl) phosphate; Triethoxyphosphine oxide
3D model (JSmol)
Abbreviations TEP, Et3PO4
ECHA InfoCard 100.001.013
Molar mass 182.15 g/mol
Density 1.072 g/cm3
Melting point −56.5 °C (−69.7 °F; 216.7 K)
Boiling point 215 °C (419 °F; 488 K)
-125.3·10−6 cm3/mol
Safety data sheet
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oilHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Flash point 107 °C (225 °F; 380 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Triethyl phosphate is a chemical compound with the formula (C2H5)3PO4 or OP(OEt)3. It is a colorless liquid. It is the triester of ethanol and phosphoric acid and can be called "phosphoric acid, triethyl ester".

Its primary uses are as an industrial catalyst (in acetic anhydride synthesis), a polymer resin modifier, and a plasticizer (e.g. for unsaturated polyesters). In smaller scale it is used as a solvent for e.g. cellulose acetate, flame retardant, an intermediate for pesticides and other chemicals, stabilizer for peroxides, a strength agent for rubber and plastic including vinyl polymers and unsaturated polyesters, etc.[2]

Triethyl phosphate is also a common intermediate in the manufacture of pesticides.


It was studied for the first time by French chemist Jean Louis Lassaigne in the early 19th century.

See also[edit]


  1. ^ "Zhangjiagang Shunchang Chemical Co., Ltd". Triethylphosphate. Archived from the original on December 17, 2004. Retrieved June 13, 2009.
  2. ^ Triethylphosphate, International Programme on Chemical Safety