Triethyl phosphate is a chemical compound with the formula (C2H5)3PO4. 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.
Triethyl phosphate is also a common intermediate in the manufacture of pesticides.

Appearance and properties: transparent colorless liquid

Density: 1.072 g/mL at 25 °C(lit.)

Boiling point: 215 °C(lit.)

Melting point: -56 °C

Flash point: 240 °F

Refractive index: n20/D 1.403(lit.)

Water solubility: SOLUBLE

Stability: Stable. Combustible. Incompatible with strong oxidizing agents, water.

Storage conditions: Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Vapor density: 6.28 (vs air)

Vapor pressure: 1 mm Hg (40 °C)