Ethylene oxide-propylene oxide block copolymer

Ethylene oxide-propylene oxide block copolymer (CAS 106392-12-5) is a nonionic surfactant polymer supplied as a buffered aqueous solution. It is commercially known under designations including SYT, F77, F87, F88, and P65, with no assigned E-code. These alphanumeric grades reflect differences in block ratio and molecular weight.

In pharmaceutical manufacturing, this polymer controls foam generation during fermentation and bioreactor processes by reducing surface tension at the gas-liquid interface. In textile processing, it functions as an emulsifier and dispersant, keeping dye baths stable and preventing pigment agglomeration on fiber surfaces. Personal care formulators use it as a solubiliser and rheology modifier in aqueous systems.

The material is supplied as a buffered aqueous solution in grades corresponding to specific HLB values and viscosity profiles. It falls under REACH registration requirements for EU supply. Procurement teams should confirm grade specification against application requirements, as F77, F87, F88, and P65 differ in performance characteristics.