Triethyl phosphite is an organic compound with the chemical formula of C₆H₁₅O₃ P. It is a colorless transparent liquid. It is insoluble in water, but soluble in organic solvents such as ethanol and ether. It will hydrolyze into diethyl phosphite in water for a long time. It can be used as plasticizer, lubricant additive and stabilizer, and pesticide.

English name: Triethyl phosphite

CAS： 122-52-1

EINECS： 204-552-5

Chemical formula: C₆H₁₅O₃P

Molecular weight: 166.155

Risk Term: R10: Flammable.

       R20/22: Harmful by inhalation and if swallowed.

Safety terms: S16: Keep away from ignition sources and do not smoke.

       S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

       S36: Wear appropriate protective clothing.

Structural formula: