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Flame retardants

Triethyl phosphate

Also known as Triethylphosphate, Tris(ethyl) phosphate, Triethoxyphosphine oxide

CAS 78-40-0Formula C6H15O4PMolar mass 182.16 g/molEC 201-114-5
GHS signal word: Warning. Pictograms: Harmful or irritant 80 suppliers listed
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Triethyl phosphate chemical structure, C6H15O4P, CAS 78-40-0
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Liquid
Melting point
-56.4 °C
Boiling point
215.5 °C
Density
1.0695 g/cm³ at 20 °C
Flash point
115 °C
HS code
291990
Category
Flame retardants
UN number
UN 3265
Illustrative photo, closed blue steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Triethyl phosphate?

Plain description, key identifiers and synonyms

Triethyl phosphate is a trialkyl phosphate that is the triethy ester derivative of phosphoric acid. It is functionally related to an ethanol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
triethyl phosphate
CAS number
78-40-0 CAS number cross-checked
EC number
201-114-5
Molecular formula
C6H15O4P
UNII
QIH4K96K7J
MDL number
MFCD00009077
INCI name
TRIETHYL PHOSPHATE
InChIKey
DQWPFSLDHJDLRL-UHFFFAOYSA-N
InChI
InChI=1S/C6H15O4P/c1-4-8-11(7,9-5-2)10-6-3/h4-6H2,1-3H3
SMILES (canonical and isomeric)
CCOP(=O)(OCC)OCC

Synonyms

  • Triethylphosphate
  • Tris(ethyl) phosphate
  • Triethoxyphosphine oxide
  • Phosphoric acid, triethyl ester
  • Triethylfosfat
  • Ethyl phosphate ((EtO)3PO)
  • o-Phosphoric acid triethyl ester
  • Ethyl phosphate
  • Phosphoric Acid Triethyl Ester
  • TEP
  • O,O,O-Triethylphosphate
  • Triethyl phosphate, 99%
  • (C2H5O)3PO
  • Triethyl phosphate, analytical standard
  • Triethyl phosphate, ReagentPlus(R), >=99.8%
  • Triethyl phosphate, Vetec(TM) reagent grade, 98%
  • Triethyl phosphate Solution in Acetone, 1000?g/mL

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Liquidexp.
Odour
Mildexp.
Melting point
-56.4 °Cexp.
Boiling point
215.5 °Cexp.
Density
1.0695 g/cm³ at 20 °Cexp.
Flash point
115 °Cexp.
Autoignition temperature
454 °Cexp.
Solubility
In water, 5.00 × 10⁺⁵ mg/L at 25 °Cexp.
Vapour pressure
0.39 mm Hg at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
182.16 g/molcalc.
Exact mass
182.0708 Dacalc.
LogP (octanol/water)
2.2calc.
Topological polar surface area
44.76 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
6calc.
Heavy atoms
11calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant
111NFPA 704 rating

Hazard statements

  • H302Harmful if swallowed.
Precautionary statements (5)
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P301 + P317If swallowed: Get medical help.
  • P330Rinse mouth.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3265
Transport hazard class
6.1
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Triethyl phosphate suppliers

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All 80 suppliers
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Where suppliers are based

80 suppliers in 16 countries

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Triethyl phosphate price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Used as a catalyst in the production of acetic anhydride by the ketene process, as a desensitizing agent for peroxides, and as a solvent and plasticizer for cellulose acetate.

Solvent, plasticizer for resins, plastics, gums, catalyst, lacquer remover.

As a plasticizer, solvent, fire-retarding agent, anti-foaming agent.

As an ethylating agent, and as a raw material to prepare insecticides such as tetraethyl pyrophosphate.

As ethylating agent, formation of polyesters which are used as insecticides.

Industrial uses: Plasticizer, Flame retardant, Catalyst, Intermediate, Chemical reaction regulator.

Consumer uses: Flame retardant, Chemical reaction regulator.

Use classes: Plastics.

Cosmetic ingredient, INCI name TRIETHYL PHOSPHATE(solvent)

Functional uses

  • Flame retardant
  • Plasticizer
  • Solvent

Cosmetic functions

  • Solvent

How it is made

Prepared from tetraethyl hypophosphate with ethanol in the presence of aluminum ethoxide, Manufactured by treating triethylphosphite with diethyl hydrogen phosphate.

Manufactured from diethyl ether and phosphorus pentoxide via a metaphosphate intermediate.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 015-013-00-7

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Triethyl phosphate is traded under.

HS 2919.90Indicative HS code

Phosphoric, and their salts, including lactophosphates, their halogenated, sulphonated, nitrated…

World exports in 2024
$940M
−0.7% vs 2023, imports $863M
2019 to 2024
Top exporters
  1. China55.6%
  2. Germany10.6%
  3. Italy6.2%
Top importers
  1. United States15.8%
  2. South Korea10.1%
  3. Germany6.4%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Triethyl phosphate is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Triethyl phosphate, based on the data on this page

What is Triethyl phosphate?

Triethyl phosphate is a trialkyl phosphate that is the triethy ester derivative of phosphoric acid. It is functionally related to an ethanol.

What is the CAS number of Triethyl phosphate?

The CAS registry number of Triethyl phosphate is 78-40-0.

What is the molecular formula and weight of Triethyl phosphate?

The molecular formula of Triethyl phosphate is C6H15O4P and its molar mass is 182.16 g/mol.

What is Triethyl phosphate used for?

Used as a catalyst in the production of acetic anhydride by the ketene process, as a desensitizing agent for peroxides, and as a solvent and plasticizer for cellulose acetate. Solvent, plasticizer for resins, plastics, gums, catalyst, lacquer remover. As a plasticizer, solvent, fire-retarding agent, anti-foaming agent.

Is Triethyl phosphate hazardous?

Triethyl phosphate carries the GHS signal word "Warning". Main hazards: harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Triethyl phosphate?

Triethyl phosphate is usually classified under HS code 291990 (Phosphoric esters and their salts, including lactophosphates, their halogenated…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Triethyl phosphate?

CompoundList lists 80 suppliers of Triethyl phosphate in China, United States, India, Canada and 12 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Triethyl phosphate in India?

10 suppliers in India list Triethyl phosphate on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Triethyl phosphate?

Suppliers quote Triethyl phosphate on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Triethyl phosphate

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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