Chinese Japanese Germany Korea

Triethyl phosphate

Triethyl phosphate
Triethyl phosphate structure
Chemical Name:
Triethyl phosphate
TEP;(C2H5O)3PO;AURORA KA-1638;Triethylphosph;Triethylfosfat;ETHYL PHOSPHATE;Phosphoric ether;Triethyl Phospate;TEP)Triethyl phosp;TRIETHYL PHOSPHATE
Molecular Formula:
Formula Weight:
MOL File:

Triethyl phosphate Properties

Melting point:
-56 °C
Boiling point:
215 °C(lit.)
1.072 g/mL at 25 °C(lit.)
vapor density 
6.28 (vs air)
vapor pressure 
1 mm Hg ( 40 °C)
refractive index 
n20/D 1.403(lit.)
Flash point:
240 °F
storage temp. 
Store below +30°C.
500g/l (slow decomposition)
Specific Gravity
7 (H2O, 20℃)
explosive limit
Water Solubility 
Hydrolytic Sensitivity
7: reacts slowly with moisture/water
Stable. Combustible. Incompatible with strong oxidizing agents, water.
Indirect Additives used in Food Contact Substances
CAS DataBase Reference
78-40-0(CAS DataBase Reference)
NIST Chemistry Reference
Triethyl phosphate(78-40-0)
EPA Substance Registry System
Triethyl phosphate (78-40-0)
  • Risk and Safety Statements
Signal word  Warning
Hazard statements  H336-H361-H371-H302-H319
Precautionary statements  P201-P202-P260-P264-P270-P271-P280-P301+P312+P330-P304+P340+P312-P305+P351+P338+P337+P313-P308+P311-P403+P233-P405-P501-P305+P351+P338-P301+P312a-P330-P501a
Hazard Codes  Xn
Risk Statements  22-36
Safety Statements  25-26
RIDADR  3278
WGK Germany  1
RTECS  TC7900000
Autoignition Temperature 845 °F
HS Code  29190090
Toxicity LD50 orally in Rabbit: 1165 mg/kg
NFPA 704
1 1

Triethyl phosphate price More Price(17)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 538728 Triethyl phosphate ReagentPlus , ≥99.8% 78-40-0 1l $92.9 2020-08-18 Buy
Sigma-Aldrich 538728 Triethyl phosphate ReagentPlus , ≥99.8% 78-40-0 4l $208 2020-08-18 Buy
TCI Chemical P0270 Triethyl Phosphate >99.0%(GC) 78-40-0 25g $13 2020-06-24 Buy
TCI Chemical P0270 Triethyl Phosphate >99.0%(GC) 78-40-0 500g $37 2020-06-24 Buy
Alfa Aesar A17938 Triethyl phosphate, 98+% 78-40-0 500g $40.9 2020-06-24 Buy

Triethyl phosphate Chemical Properties,Uses,Production

Chemical Properties

Triethyl phosphate is a colorless, high-boiling liquid and containing 17 wt % phosphorus; mild odor. Very stable at ordinary temperatures, compatible with many gums and resins, soluble in most organic solvents, miscible with water. When mixed with water is quite stable at room temperature, but at elevated temperatures it hydrolyzes slowly. Combustible.It is manufactured from diethyl ether and phosphorus pentoxide via a metaphosphate intermediate.
Triethyl phosphate
Triethyl phosphate has been used commercially as an additive for polyester laminates and in cellulosics. In polyester resins it functions as a viscosity depressant and as a flame retardant. The viscosity-depressant effect of triethyl phosphate in polyester resin permits high loadings of alumina trihydrate, a fire- retardant smoke-suppressant filler. Triethyl phosphate has also been employed as a flame-resistant plasticizer in cellulose acetate. Because of its water solubility, the use of triethyl phosphate is limited to situations where weathering resistance is unimportant. The halogenated alkyl phosphates are generally used for applications where lower volatility and greater resistance to leaching are required.


Triethyl phosphate is use as a flame retardant in the manufacture of polyisocyanurate (PIR) and polyurethane (PUR) foam insulation and thermoset plastic products. The chemical compound is also used as a viscosity reducer in plastic resins, and as a catalyst, solvent or intermediate in the production of pesticides, pharmaceuticals, lacquers and other products.As ethylating agent; formation of polyesters which are used as insecticides.


ChEBI: A trialkyl phosphate that is the triethy ester derivative of phosphoric acid.

Production Methods

Prepared by the reaction of tetraethyl hypophosphate with ethanol in the presence of aluminum ethoxide or by treating triethyl phosphate with diethyl hydrogen phosphate.

Synthesis Reference(s)

The Journal of Organic Chemistry, 25, p. 1000, 1960 DOI: 10.1021/jo01076a035

General Description

A colorless, corrosive liquid. Combustible. Slowly dissolves in water and sinks in water. Severely irritates skin, eyes and mucous membranes.

Air & Water Reactions

Slowly dissolves in water with slight decomposition .

Reactivity Profile

Organophosphates, such as Triethyl phosphate, are susceptible to formation of highly toxic and flammable phosphine gas in the presence of strong reducing agents such as hydrides. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides.

Health Hazard

May be harmful by inhalation, ingestion or absorption. May cause irritation.

Fire Hazard

Special Hazards of Combustion Products: May produce hazardous decomposition products such as carbon dioxide, carbon monoxide and oxides of phosphorus.

Industrial uses

1 Plasticizer for cellulose acetate, resins, plastics, gums.
2 Flame retardant additive in unsaturated polyester resins.
3 Solvent; lacquer remover.
4 Catalyst.
5 Chemical intermediate; ethylating agent.

Safety Profile

Moderately toxic by ingestion, intraperitoneal, and intravenous routes. Experimental reproductive effects. Mutation data reported. Causes cholinesterase inhibition, but to a lesser extent than parathion. May be expected to cause nerve injury similar to that of other phosphate esters. Triethyl phosphate is stable under normal conditions of use. Avoid contact with strong bases and oxidizing agents. Triethyl phosphate is combustible at high temperatures. Heating to decomposition may release carbon dioxide, carbon monoxide, phosphorus oxides and other potentially toxic fumes or gases. Avoid heat, open flames and other potential sources of ignition.

Environmental Fate

Triethyl phosphate is not readily biodegradable. An accidental release of vapors to air, or liquid to soils or water, will degrade slowly in the environment. Releases to water may pose a danger to fish (low toxicity), invertebrates (low toxicity) and aquatic plants (low toxicity) prior to degradation. The chemical is not expected to adsorb to suspended soils and sediments.


A system utilizing isolated anterior forearm stratum corneum conjunctum of man to study skin penetrating capacity of a series of organic phosphates was developed. Trimethyl phosphate was the most penetrating, followed by triethyl phosphate, in a series of 8 trialkyl esters (Marzulli et al 1965).
Rats treated orally at 100 mg/kg and mice treated i.p. at 1000 mg/kg with [32P]-labeled triethyl phosphate excreted diethyl phosphate in the urine. No parent compound was detected in the urine of either species. S-Ethyl cysteine and S-ethyl cysteine N-acetate were also isolated. The compound was excreted very rapidly, with 90% of the administered dose in the urine in 16 h and nearly 100% within 96 h (Jones 1970).

Purification Methods

Dry the ester by refluxing it with solid BaO and then fractionally distil it under reduced pressure. It is kept over Na and distilled. Store it in the receiver protected from light and moisture. Alternatively it is dried over Na2SO4 and distilled under reduced pressure. The middle fraction is stirred for several weeks over anhydrous Na2SO4 and again fractionated under reduced pressure until the specific conductance reaches a constant low value of 25 1.19 x 108, 40 1.68 x 108, and 55 2.89 x 108 ohm-1 cm. It has also been fractionated carefully under reduced pressure through a glass helices-packed column. It is soluble in EtOH, Et2O and H2O (dec). [Estok & Wendlandt J Am Chem Soc 77 4767 1955, Hoffmann et al. J Am Chem Soc 78 6413 1956, (P NMR) Muller et al. J Am Chem Soc 78 3557 1956, French et al. J Chem Soc 3582 1959, IR: Bellamy & Beecher J Chem Soc 475 1952 and McIvor Can J Chem 36 820 1958, Kosolapoff Organophosphorus Compounds, Wiley p 258 1950, Beilstein 1 IV 1339.]

Triethyl phosphate Preparation Products And Raw materials

Raw materials

Preparation Products

Triethyl phosphate Suppliers

Global( 362)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
13806087780 +86 13806087780 CHINA 17852 58
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 2754 55
Xiamen AmoyChem Co., Ltd
+86 592-605 1114 CHINA 6371 58
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21869 58
Hangzhou Bayee Chemical Co., Ltd.
0086-571-85775919 China 105 55
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22623 55
Shanghai Time Chemicals CO., Ltd.
+86-021-57951555 CHINA 1365 55
Tianjin Zhongxin Chemtech Co., Ltd.
022-66880086 CHINA 606 58
Shanghai Zheyan Biotech Co., Ltd.
18017610038 CHINA 3623 58
career henan chemical co
+86-371-86658258 CHINA 30037 58

View Lastest Price from Triethyl phosphate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2020-08-24 Triethyl phosphate
US $10.00 / KG 10g 99 10 tons Xingtai Haoxun Import and Export Trade Co., Ltd.
2019-04-04 Triethyl phosphate
US $6.00 / kg 1kg High quality Professional Factory Ms Ella Chemwill Asia Co.,Ltd.
2020-01-10 triethyl phosphate
US $1.00-0.00 / KG 1KG 99% 100000KG Shaanxi Dideu Medichem Co. Ltd

Triethyl phosphate Spectrum

78-40-0(Triethyl phosphate)Related Search:

Copyright 2017 © ChemicalBook. All rights reserved