StructureTributoxyethyl phosphate (TBEP)
CAS No. 78-51-3
EC No. 201-122-9
Synonyms Tris(2-butoxyethyl) phosphate; tri(butoxyethyl)phosphate; KP-140; TBEP; Phosphoric acid tris(2-Butoxyethyl)ester; 2-butoxy-ethanol phosphate (3:1)

Tributoxyethyl phosphate (TBEP)

Tributoxy ethyl phosphate (TBEP) is a phosphate ester that, thanks to its structure, can be used in many applications including plasticisation, solvation, flame retardancy and defoaming.

Tributoxy ethyl phosphate (TBEP) is in fact a multifunctional additive that may be used to modify the properties of many polymer systems and is a particularly good levelling aid and coalescent additive for emulsion polymers.

Tributoxy ethyl phosphate (TBEP) is used in a mixed solvent/aqueous system as a defoamer during production and as a secondary plasticiser in many polymers. The above properties in combination with inherent flame retardancy makes Tributoxy ethyl phosphate (TBEP) a real multifunctional additive essential to many polymer formulations.


  • in acrylic based polishes where its coalescent and plasticising properties will improve levelling and gloss, enabling a "dry bright" finish to be obtained. It will also reduce surface defects such as streaking, crazing, and powdering. Tributoxy ethyl phosphate (TBEP) is used also in acrylic gloss paint formulations as a coalescent and defoamer.
  • Tributoxy ethyl phosphate (TBEP) also helps to improve pigment wetting and rheological properties with a minimal effect on reflectance Tributoxy ethyl phosphate (TBEP) is a highly effective "knockdown" defoamer used extensively in paint, textile and paper industries.
  • Tributoxy ethyl phosphate (TBEP) is also used as a halogen free flame retardant additive in polymer systems. It can be used also in conjunction with other flame retardants.

Shelf Life

Under proper storage conditions, the shelf life is 12 months.

​Health & Safety

Detailed information on the product described can be found in our relevant Health and Safety Information (Material Safety Data Sheet).