What is Triethyl Phosphate TEP CAS 78-40-0?

Triethyl Phosphate, commonly abbreviated TEP and also called phosphoric acid triethyl ester, is a phosphate ester with molecular formula C6H15O4P. It is used as a flame-retardant, plasticizing and resin-modifying raw material rather than as a finished product.

Why is Triethyl Phosphate used in polyurethane foam systems?

TEP can act as a phosphate-ester flame retardant in polyurethane and polyisocyanurate foam formulations. It contributes phosphorus during combustion, which can promote char formation and help meet the fire-performance requirements of the finished foam system.

Does Triethyl Phosphate also function as a plasticizer?

Yes. TEP can plasticize and modify selected polymers and resins, improving processing or flexibility. It is also used as a solvent, carrier or process intermediate where a liquid phosphate ester is compatible with the formulation.

What typical liquid properties should be expected for TEP?

TEP is normally a colorless transparent oily liquid with density around 1.07 g/cm3 and boiling point around 215 deg C. Its flash point is around 115-116 deg C and its refractive index is about 1.403-1.405.

Which purity-related properties are important for Triethyl Phosphate?

For many industrial formulations, relevant controls include high ester content, low acid value and low moisture because acidic or wet material can affect resin reactions or long-term stability. Chloride content may also be controlled in sensitive applications.

Triethyl Phosphate (TEP) CAS 78-40-0

Triethyl Phosphate, commonly abbreviated TEP, CAS 78-40-0, is a phosphate-ester raw material supplied as a flame-retardant, plasticizing and resin-modifying component. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 78-40-0
Synonyms: Phosphoric Acid Triethyl Ester, Triethyl Orthophosphate, TEP
Einecs: 201-114-5
Molecular Formula: C₆H₁₅O₄P
Grade: Industrial phosphate ester grade
Package: 200 kg steel drums; 1000 L IBCs by agreement

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Product Description

Triethyl Phosphate (TEP) CAS 78-40-0 is phosphoric acid triethyl ester, with EC 201-114-5 and molecular formula C₆H₁₅O₄P.

Synonyms: Phosphoric Acid Triethyl Ester; Triethyl Orthophosphate; TEP.

CAS: 78-40-0.

Molecular formula: C₆H₁₅O₄P.

It is supplied as a colourless transparent oily liquid.

It is positioned as a phosphate-ester raw material used as a flame-retardant, plasticizing and resin-modifying component.

It is not a finished insulation foam, fire-retardant package or formulated resin.

It is used in polyurethane and polyisocyanurate foam-insulation formulations.

It is used in thermoset plastics and polymer-resin modification.

It is used in industrial coating and resin systems requiring a phosphate-ester component.

It is used as a catalyst, solvent or intermediate in specified chemical processes.

It can act as a phosphate-ester flame retardant, contributing phosphorus during combustion to promote char formation.

It can plasticise and modify selected polymers and resins, improving processing or flexibility.

It has a density around 1.07 g/cm3, boiling point around 215 C, flash point around 115-116 C and refractive index about 1.403-1.405.

Confirm assay, colour, water and acid-value controls for the stated use.

Relevant controls include high ester content, low acid value and low moisture, with chloride content controlled in sensitive applications.

Store in tightly closed containers in a cool, dry, well-ventilated area, use suitable PPE when handling, and follow the current SDS.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Triethyl Phosphate TEP CAS 78-40-0?

A: Triethyl Phosphate, commonly abbreviated TEP and also called phosphoric acid triethyl ester, is a phosphate ester with molecular formula C6H15O4P. It is used as a flame-retardant, plasticizing and resin-modifying raw material rather than as a finished product.
Q:
Why is Triethyl Phosphate used in polyurethane foam systems?

A: TEP can act as a phosphate-ester flame retardant in polyurethane and polyisocyanurate foam formulations. It contributes phosphorus during combustion, which can promote char formation and help meet the fire-performance requirements of the finished foam system.
Q:
Does Triethyl Phosphate also function as a plasticizer?

A: Yes. TEP can plasticize and modify selected polymers and resins, improving processing or flexibility. It is also used as a solvent, carrier or process intermediate where a liquid phosphate ester is compatible with the formulation.
Q:
What typical liquid properties should be expected for TEP?

A: TEP is normally a colorless transparent oily liquid with density around 1.07 g/cm3 and boiling point around 215 deg C. Its flash point is around 115-116 deg C and its refractive index is about 1.403-1.405.
Q:
Which purity-related properties are important for Triethyl Phosphate?

A: For many industrial formulations, relevant controls include high ester content, low acid value and low moisture because acidic or wet material can affect resin reactions or long-term stability. Chloride content may also be controlled in sensitive applications.

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