OPE-105 (CAS number: 121809-82-3) is a nonionic surfactant produced by addition polymerization of octylphenol as the hydrophobic group with 10.5 moles of ethylene oxide, with the molecular formula C₃₅H₆₄O₁₁₅ (average) and molecular weight ~668. At room temperature, it appears as a colorless to light yellow viscous liquid with good fluidity and operability, easily soluble in water and various organic solvents.
The core interfacial chemical properties of this product are outstanding: HLB value ~13.5, classified as a hydrophilic emulsifier; cloud point (1% aqueous solution) 65~75°C; surface tension (1% aqueous solution, 25°C) as low as 30~32 mN\/m; critical micelle concentration (CMC) within the range of 0.05~0.1 mmol\/L, indicating excellent surface activity efficiency and ability to reduce surface tension. Foam characteristics are low foaming, suitable for industrial scenarios requiring rapid defoaming or low-foam operation.
In terms of chemical stability, OPE-105 maintains stable interfacial activity under acidic, alkaline, and hard water conditions and is not prone to hydrolysis or deactivation. The product's active content is ≥98%, moisture ≤0.5%, free alcohol content ≤0.5%, flash point >200°C, no defined melting point (liquid at room temperature), and slightly hygroscopic. Heavy metal content ≤10 mg\/kg, arsenic content ≤2 mg\/kg, meeting industrial-grade product quality standards.
| Parameter Item | Specification\/Value | Test Condition |
|---|---|---|
| Product Name | OPE-105 (Octylphenol Polyoxyethylene Ether) | — |
| CAS Number | 121809-82-3 | — |
| Ionic Type | Nonionic Surfactant | — |
| Molecular Formula | C₃₅H₆₄O₁₁₅ (Average) | — |
| Molecular Weight | ~668 | — |
| Appearance | Colorless to Light Yellow Viscous Liquid | 25°C |
| Active Content | ≥98% | — |
| HLB Value | 13.5 | — |
| Cloud Point | 65~75°C | 1% Aqueous Solution |
| pH Value | 6.0~8.0 | 1% and 5% Aqueous Solution |
| Density | ~1.06 g\/cm³ | 25°C |
| Kinematic Viscosity \/ Low Shear Viscosity | 200~400 mm²\/s (mPa·s) | 25°C |
| Refractive Index | 1.485~1.490 | 20°C |
| Flash Point | >200°C | — |
| Surface Tension | 30~32 mN\/m | 1% Aqueous Solution, 25°C |
| Critical Micelle Concentration (CMC) | 0.05~0.1 mmol\/L | — |
| Hydroxyl Value | 80~90 mgKOH\/g | — |
| Acid Value | ≤1.0 mgKOH\/g | — |
| Saponification Value | ≤1.0 mgKOH\/g | — |
| Iodine Value | ≤1.0 gI₂\/100g | — |
| Unsaturation | ≤0.01 mol\/kg | — |
| Moisture | ≤0.5% | — |
| Free Alcohol | ≤0.5% | — |
| Melting Point | Liquid, No Defined Melting Point | — |
| Foam Characteristics | Low Foaming | — |
| Chemical Stability | Stable in Acid, Alkali, and Hard Water | — |
| Solubility | Easily Soluble in Water and Organic Solvents | — |
| Hygroscopicity | Slightly Hygroscopic | — |
| Heavy Metals | ≤10 mg\/kg | — |
| Arsenic (As) | ≤2 mg\/kg | — |
| Packaging Specification | 50kg Plastic Drum \/ 200kg Plastic Drum \/ IBC Tote | — |
Based on the above physicochemical parameters, the HLB value of 13.5 makes OPE-105 particularly suitable as an emulsifier for O\/W (oil-in-water) emulsion systems. In pesticide emulsifiable concentrates and emulsion formulations, it enables spontaneous and stable dispersion of oil-phase active ingredients in water. The cloud point of 65~75°C means that under normal industrial operating temperatures (<65°C), it remains completely water-soluble and maintains optimal surface activity. When the system temperature exceeds the cloud point range, the product precipitates from water; this characteristic can be utilized in certain specific cleaning or separation processes.
Its low surface tension (30~32 mN\/m) and low CMC (0.05~0.1 mmol\/L) mean that excellent wetting and penetration effects can be achieved at very low addition levels. Recommended dosage in applications such as textile scouring penetrants and industrial degreasing cleaners is 0.5%~5% (by weight of working solution). The low foaming property makes it particularly suitable for spray cleaning and high-speed stirring conditions, reducing the need for additional defoamers. The viscosity range of 200~400 mm²\/s offers good flowability for handling, facilitating precise metering and pipeline transportation.
When used in formulations, OPE-105, being nonionic, can be combined with anionic, cationic, or other nonionic surfactants in any proportion for synergistic effects. In "