The core advantage of emulsifier S-185/O-5 (polyoxyethylene(35) stearyl ether) stems from the precise design of its molecular structure. Compared to common AEO series with short C12-14 carbon chains and low EO numbers (e.g., EO=7, 9, 12), S-185/O-5 uses a C16-18 fatty alcohol chain, offering stronger affinity for hydrophobic substrates such as mineral oils, animal and vegetable oils, and waxes. At the same time, its hydrophilic segment with up to 35 EO units imparts excellent water solubility and emulsification dispersion efficiency, enabling the effective construction and long-term stabilization of O/W (oil-in-water) emulsions, significantly delaying oil separation and sedimentation in high-end formulations such as pesticide emulsifiable concentrates and microemulsions.
In terms of chemical tolerance, this product exhibits extremely broad compatibility. Ordinary nonionic surfactants often lose effectiveness in high-concentration salt, acid, or alkali environments due to a decrease in cloud point, but S-185/O-5, with its long EO chain providing a large steric stabilization effect, maintains excellent wetting and penetration properties in harsh industrial hard surface cleaners and alkali-resistant textile scouring agents. Moreover, its paste form with "high active matter content and low moisture" allows it to not only improve formulation efficiency during compounding but also reduce interference from ineffective diluents on the final product.
It is worth noting that, unlike some alternatives to alkylphenol polyoxyethylene ether (APEO) that place greater pressure on aquatic environments, S-185/O-5, as a stearyl alcohol polyether nonionic surfactant, meets the stringent requirements of current green industrial formulations for raw material biocompatibility while satisfying high emulsification performance, making it an ideal upgrade choice for fields such as paint polymerization and metal-plastic degreasing.
Based on its high-performance advantages, Guoli Chemical recommends prioritizing the use of emulsifier S-185/O-5 in the following challenging scenarios:
Although the product exhibits excellent acid and alkali resistance, safety protection is still required during operation. This product is classified as a Category 2 skin irritant and is a solid paste; appropriate heating is needed before operation to facilitate pumping and dispersion. High-concentration contact may cause skin defatting or cracking; please wear chemical-resistant gloves and goggles during work. Storage temperature is recommended to be controlled between 5-40°C. After opening, please seal tightly as soon as possible to prevent moisture absorption that may affect the active matter content.