Is Triethyl Phosphate (TEP) the same substance as phosphoric acid triethyl ester?

Yes. Triethyl Phosphate, TEP, phosphoric acid triethyl ester and triethyl orthophosphate are names used for CAS 78-40-0. The commercial material should still be matched by the agreed assay, moisture and impurity controls.

Is TEP supplied as a finished flame-retardant foam, coating or plastic product?

No. TEP is a phosphate ester raw material used in selected formulations. The finished foam, coating, plastic or textile system depends on the resin, other additives, processing conditions and the required test standard.

Which TEP information should be confirmed before a formulation order?

Confirm assay, colour, moisture, acid value, chloride content, density, packaging and the intended formulation role before approval. The batch COA, product TDS and SDS should correspond to the agreed industrial grade and end-use requirements.

Triethyl Phosphate (TEP) CAS 78-40-0

Triethyl Phosphate (TEP), CAS 78-40-0, is a liquid phosphate ester used as a halogen-free flame-retardant plasticizer, high-boiling solvent and process additive in polymer, coating, textile and resin formulations. Also called phosphoric acid triethyl ester, it is an industrial raw material rather than a finished foam, coating or plastic article. Selection depends on the resin, additive package, phosphorus requirement and end-use compliance target. Commercial lots should be matched by assay, colour, moisture, acid value, chloride content, density and packaging. Batch COA, TDS and SDS can be reviewed against the agreed grade. For solid intumescent systems rather than a liquid phosphate ester plasticizer, Ammonium Polyphosphate (APP) is a related phosphorus flame-retardant material to evaluate separately by resin system and processing route.

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
Appearance: Clear, colorless liquid
Assay: ≥99.5%
Color (APHA): ≤10
Moisture: ≤0.20%
Acid value: ≤0.05 mg KOH/g
Chloride: ≤5 ppm

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Product Description

1 Product Introduction

2 Applications

3 Grade and Documentation

Product Introduction

Triethyl Phosphate (TEP) (CAS 78-40-0), also called phosphoric acid triethyl ester, is a phosphate-ester raw material used as a flame-retardant, plasticizing and resin-modifying component. The listed product is supplied for polymer, foam, coating and chemical-process manufacture; it is not a finished insulation foam, fire-retardant package or formulated resin.

Applications

Polyurethane and polyisocyanurate foam-insulation formulations
Thermoset plastics and polymer-resin modification
Industrial coating and resin systems requiring a phosphate-ester component
Catalyst, solvent or intermediate use in specified chemical processes

Grade and Documentation

A TEP order is specified for the stated polymer or process use, with the agreed assay, colour, water and acid-value controls. A batch COA, with the relevant TDS and SDS, is available for the quoted Triethyl Phosphate grade. Packaging and quantity are matched to the confirmed formulation or industrial-processing requirement.

For related phosphorus-containing raw material pages, review Tributyl Phosphate, Dimethyl Hydrogen Phosphite, and Ammonium Polyphosphate.

FAQ - Technical & Supply Chain

Q:
Is Triethyl Phosphate (TEP) the same substance as phosphoric acid triethyl ester?

A: Yes. Triethyl Phosphate, TEP, phosphoric acid triethyl ester and triethyl orthophosphate are names used for CAS 78-40-0. The commercial material should still be matched by the agreed assay, moisture and impurity controls.
Q:
Is TEP supplied as a finished flame-retardant foam, coating or plastic product?

A: No. TEP is a phosphate ester raw material used in selected formulations. The finished foam, coating, plastic or textile system depends on the resin, other additives, processing conditions and the required test standard.
Q:
Which TEP information should be confirmed before a formulation order?

A: Confirm assay, colour, moisture, acid value, chloride content, density, packaging and the intended formulation role before approval. The batch COA, product TDS and SDS should correspond to the agreed industrial grade and end-use requirements.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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