The chemical name of Polyoxyethylene Stearate SG-9 is polyoxyethylene (9) stearate (English name: Polyethylene Glycol Monostearate, 9 EO), CAS number 9004-99-3, which is a nonionic surfactant. Its aliases also include: polyethylene glycol monostearate, PEG-9 stearate, etc.
From a molecular structure perspective, this product is made by using naturally derived or synthetic stearic acid (octadecanoic acid) as the hydrophobic end initiator, undergoing addition polymerization with ethylene oxide (EO) under the action of a catalyst. The "9" indicates that an average of 9 ethylene oxide units are incorporated per molecule, forming the hydrophilic polyoxyethylene chain segment. This structure imparts the typical amphiphilic molecular characteristic of having one lipophilic end and one hydrophilic end.
The product appears as a white to slightly yellow waxy solid with an HLB value of approximately 11~12, possessing good emulsifying, dispersing, wetting, solubilizing, and antistatic properties. As a nonionic surfactant, it remains stable over a wide pH range, has strong hard water resistance, and can be widely used in combination with anionic, cationic, and other nonionic surfactants.
| Parameter | Value |
|---|---|
| Chemical Name | Polyoxyethylene (9) stearate |
| CAS Number | 9004-99-3 |
| Aliases | Polyethylene glycol monostearate, PEG-9 stearate |
| Ionic Type | Nonionic surfactant |
| Raw Material Composition | Stearic acid + 9 moles of ethylene oxide (EO) |
| Appearance | White to slightly yellow waxy solid |
| HLB Value | Approximately 11~12 |
| Solubility | Dispersible/soluble in water (forming emulsion or micellar solution) |
Based on the structural characteristics of its main component (lipophilic stearic acid chain + hydrophilic PEG-9 segment), this product is widely used in the following fields: