Fatty Alcohol Polyether (CAS 166736-08-9): Chemistry, Uses, and Sourcing

Fatty Alcohol Polyether
 
   A Guangzhou personal care manufacturer had been running a stable conditioner line for three years when a new batch of Fatty Alcohol Polyether arrived from a domestic supplier they had recently added as a second source. On paper the material looked fine — assay in range, HLB within spec, color acceptable. But within two weeks of filling, translucent bottles started showing separation at the bottom. The plant’s formulation chemist eventually traced it to an unexpected narrowing of the ethylene oxide chain distribution in the new batch. The previous supplier had been producing material with a broader EO profile that happened to interact favorably with the silicone emulsion droplets in the formula; the new supplier’s tighter distribution broke that coincidental stability. Three years of cumulative formula development — one undocumented assumption baked deep into it.
 
  ♦That incident illustrates why Fatty Alcohol Polyether, despite being sold as a commodity surfactant, is actually a family of related but distinct materials whose commercial utility depends on details that assay certificates rarely report in full. The molecule is made by reacting a long-chain primary fatty alcohol, typically derived from palm kernel or coconut oil and running from C12 to C18 carbons, with ethylene oxide under elevated pressure and alkaline catalysis. The result is a nonionic structure in which the fatty chain handles oiliness and affinity for nonpolar surfaces while the polyethylene glycol portion handles water solubility and interfacial activity. The ratio of ethylene oxide molecules added per fatty alcohol molecule — usually somewhere between 3 and 25 depending on the application — shifts the balance between those two functions and determines the product’s cloud point, HLB value, and how it behaves in a given formulation.
  Cleaning applications absorb much of what is produced globally, particularly at EO levels in the 7-to-12 range where the molecule delivers strong detergency with low foam — a combination that liquid laundry concentrates and automatic dishwasher formulas both depend on. High-EO versions find use in industrial and institutional cleaning, where food processing lines, pharmaceutical CIP circuits, and brewery bottle washers need surfactants compatible with both caustic and acidic cleaning cycles across a wide temperature range. The low-foam character is especially valued in these environments because foam interferes with pump performance, level sensors, and the fluid dynamics of spray systems. A cleaning engineer at a beverage plant in Shandong once described it as the difference between a system that cleans itself and one that clogs itself with froth every other shift.
  The textile industry has a long history with the product in scouring and dyeing operations. During scouring, it removes sizing agents and natural waxes from greige fabric before dyeing. In jet dyeing machines, where fabric circulates through a high-velocity liquor stream, foam control is critical — excessive foam slows circulation, creates uneven dye penetration, and ultimately results in fabric that fails color uniformity testing. Fatty Alcohol Polyether at moderate EO levels performs leveling duty while keeping the liquor clean of foam, and its relatively stable behavior under the elevated temperatures of reactive dyeing does not require continuous antifoam dosing as some lower-performance alternatives do. Mills in Keqiao and Shaoxing processing large polyester and cotton blended fabrics have worked with this surfactant class routinely for decades.
Fatty Alcohol Polyether
  Agricultural chemical formulations use it differently — not for its detergency but for its ability to emulsify crop protection active ingredients and improve their penetration through the waxy cuticle of plant leaves. Emulsifiable concentrates for fungicides and herbicides typically contain a blend of surfactants in which Fatty Alcohol Polyether contributes emulsion stability during the field dilution step, where the concentrate meets water of unpredictable hardness and temperature. A senior formulation chemist at an agrochemical company in Hubei described running extended hot/cold stability testing on thirty-seven different emulsifier combinations before settling on one that survived the temperature swings of outdoor drum storage in Southeast Asian distribution networks; the Fatty Alcohol Polyether component in that package turned out to be the one that held the emulsion together when overnight temperatures dropped faster than expected after a hot day.

  When evaluating material for purchase, active content and EO adduct distribution are more informative than assay alone. Color and odor can indicate oxidation during storage or trace contamination from the catalyst. Cloud point gives practical information about temperature-dependent behavior in formulations. Water content affects both effective concentration and downstream stability. Buyers working with sensitive emulsion systems or regulated end-use categories should request chromatographic EO distribution data alongside the standard CoA, especially when qualifying new suppliers or evaluating cost-alternative materials.

Shandong Lookchemical Co., Ltd. supplies Fatty Alcohol Polyether (CAS 166736-08-9) to manufacturers in the personal care, cleaning, textile processing, and agricultural chemical sectors. The company provides batch documentation including Certificate of Analysis, Safety Data Sheet, and export compliance paperwork appropriate to the destination market. Samples for incoming qualification testing are available on request. Technical inquiries about specification details or application compatibility can be submitted to the chemistry team at sales01@sdlookchemical.com, and additional product information including technical documentation is available at sdlookchem.com.

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