Triethyl phosphate is an organic 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".

Triethyl phosphate^[1]

Names
Preferred IUPAC name Triethyl phosphate
Other names Phosphoric acid triethyl ester Phosphoric ester (archaic) Flame retardant TEP[2] Tris(ethyl) phosphate Triethoxyphosphine oxide Ethyl phosphate (neutral)
Identifiers
CAS Number	78-40-0 Y
3D model (JSmol)	Interactive image
Abbreviations	TEP, Et3PO4
ChEBI	CHEBI:45927 Y
ChemSpider	6287 Y
DrugBank	DB03347 Y
ECHA InfoCard	100.001.013
PubChem CID	6535
UNII	QIH4K96K7J Y
CompTox Dashboard (EPA)	DTXSID8026228
InChI InChI=1S/C6H15O4P/c1-4-8-11(7,9-5-2)10-6-3/h4-6H2,1-3H3 Y Key: DQWPFSLDHJDLRL-UHFFFAOYSA-N Y InChI=1/C6H15O4P/c1-4-8-11(7,9-5-2)10-6-3/h4-6H2,1-3H3 Key: DQWPFSLDHJDLRL-UHFFFAOYAA
SMILES O=P(OCC)(OCC)OCC
Properties
Chemical formula	C6H15O4P
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)
Solubility in water	Miscible
Magnetic susceptibility (χ)	-125.3·10−6 cm3/mol
Hazards
NFPA 704 (fire diamond)	2 1 0
Flash point	107 °C (225 °F; 380 K)
Safety data sheet (SDS)	http://www.sciencelab.com/msds.php?msdsId=9925320
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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.^[3]