Triethyl phosphate

Triethyl phosphate (CAS 78-40-0), commonly abbreviated as TEP, is a phosphate ester used primarily as a flame retardant and reactive intermediate across industrial manufacturing. It functions by introducing phosphorus into polymer systems or formulations to reduce flammability.

In plastics and polymer processing, TEP acts as a reactive flame retardant additive incorporated into resins, coatings, and laminates destined for automotive and aerospace components. This improves thermal stability in demanding environments.

Textile manufacturers apply it during fiber treatment and finishing processes to impart durable flame resistance to synthetic and blended fabrics. In the construction sector, TEP is used in flame-retardant coatings and insulation materials.

These applications are critical where building codes require specific fire performance ratings. It also functions as a catalyst and solvent in the production of pesticides, pharmaceuticals, and specialty chemicals, where its controlled reactivity supports synthesis.

Triethyl phosphate is supplied as a clear liquid in standard industrial packaging, including drums and intermediate bulk containers (IBCs). Technical grade is the primary commercial form for industrial and synthesis applications.

Purity levels are typically at 99% or higher for most industrial uses. Specifications are generally aligned with technical-grade standards, and buyers should confirm purity and phosphorus content with suppliers when sourcing for reactive end uses.