Triethyl phosphate (TEP) CAS No.78-40-4

Triethyl phosphate (TEP) CAS No.78-40-4, is an organophosphorus compound with the chemical formula (C₂H₅O)₃PO. It is a colorless, odorless liquid used primarily as a flame retardant, plasticizer, and solvent. TEP’s versatility and stability make it a valuable chemical in various industrial applications, from plastics to pharmaceuticals.

Key Properties of Triethyl phosphate (TEP) 

  • Chemical Formula: (C₂H₅O)₃PO

  • CAS Number: 78-40-4

  • Molecular Weight: 182.15 g/mol

  • Appearance: Colorless, transparent liquid

  • Solubility: Soluble in water, alcohol, and most organic solvents

  • Boiling Point: 215–216°C

  • Density: 1.072 g/cm³

  • Stability: Chemically stable under normal conditions

These properties enable TEP to function effectively in diverse applications.

Applications of Triethyl phosphate (TEP) CAS No.78-40-4

1. Flame Retardant

TEP is widely used as a flame retardant in:

  • Plastics and resins: Enhances fire resistance in polyurethane, polyester, and epoxy resins.

  • Textiles: Applied to fabrics to meet fire safety standards in upholstery and clothing.

2. Plasticizer

TEP serves as a plasticizer in:

  • Polymer manufacturing: Improves flexibility and durability in plastics like cellulose acetate and nitrocellulose.

  • Coatings and adhesives: Enhances workability and performance in paints and sealants.

3. Solvent and Chemical Intermediate

  • Solvent: Used in industrial processes for dissolving resins, gums, and other organic compounds.

  • Chemical synthesis: Acts as an intermediate in the production of pesticides, pharmaceuticals, and other chemicals.

4. Other Industrial Uses

  • Catalysts: Employed as a catalyst or stabilizer in chemical reactions.

  • Lubricants: Used in high-temperature lubricants to improve performance.

  • Pharmaceuticals: Serves as a component in certain drug formulations.