OP-7 (Octylphenol Ethoxylate (7) Ether, CAS No. 9036-19-5) is a high-purity nonionic surfactant produced by Guoli Chemical, appearing as a colorless to light yellow transparent oily liquid with an active content of ≥99%. Its molecular structure is a polyoxyethylene ether formed by the addition of octylphenol with 7 ethylene oxide (EO) units, with a molecular weight of approximately 514 g/mol, belonging to the alkylphenol ethoxylate (APEO) surfactant class. With its unique hydrophilic-lipophilic balance design, this product plays an irreplaceable role in many industrial formulations.
The core advantage of OP-7 lies in the high integration of four key properties: first, efficient emulsification and dispersion capacity, with excellent emulsifying effects on various oil phases such as mineral oils, aromatic solvents, and vegetable oils, producing highly stable emulsions; second, outstanding wetting and detergency, with a low surface tension of about 30 mN/m (0.1% aqueous solution) and a critical micelle concentration of about 0.2 mmol/L, enabling rapid penetration and removal of various stains; third, broad chemical compatibility, showing excellent resistance to acids, alkalis, and calcium/magnesium ions in hard water, suitable for complex chemical environments; fourth, multifunctionality in application, where a single component can meet multiple process requirements such as emulsification, wetting, dispersion, and detergency, effectively simplifying formulation design and reducing overall costs.
It is worth noting that OP-7 has a cloud point characteristic of 25~35°C, appearing transparent at room temperature, which facilitates blending and use; it has low foaming properties, making it especially suitable for industrial cleaning scenarios requiring low foam or easy rinsing; the product is easily soluble in both oil and water, possessing both oil solubility and water dispersibility, allowing it to function in both oil-based and water-based formulations. Against the backdrop of increasingly stringent environmental regulations, Guoli Chemical continuously optimizes production processes and strictly controls heavy metal content (≤10 mg/kg) and arsenic content (≤2 mg/kg) to ensure stable and reliable product quality.
| Parameter Item | Technical Indicator | Remarks |
|---|---|---|
| Chemical Name | Octylphenol Ethoxylate (7) Ether | — |
| CAS No. | 9036-19-5 | — |
| Ionic Type | Nonionic | — |
| Appearance (25°C) | Colorless to light yellow transparent liquid | — |
| Active Content | ≥99% | — |
| HLB Value | 11.7 | Hydrophilic-Lipophilic Balance Value |
| Cloud Point | 25~35 °C | 1% Aqueous Solution |
| pH Value | 5.0~7.0 | 1% Aqueous Solution |
| Surface Tension | Approx. 30 mN/m | 0.1% Aqueous Solution, 25°C |
| Critical Micelle Concentration (CMC) | Approx. 0.2 mmol/L | 25°C |
| Density | 1.05~1.07 g/cm³ | 25°C |
| Kinematic Viscosity | Approx. 250 mm²/s | 25°C |
| Refractive Index | 1.485~1.490 | 20°C |
| Flash Point (Closed Cup) | Approx. 230°C | — |
| Freezing Point | <-10°C | — |
| Moisture Content | ≤1.0% | — |
| Hydroxyl Value | Approx. 109 mg KOH/g | — |
| Acid Value | ≤1 mg KOH/g | — |
| Free Alcohol | ≤1% | — |
| Foaming Characteristics | Low Foaming | — |
| Solubility | Easily soluble in oil and water | — |
| Alkali Resistance | Alkali Resistant | — |
| Heavy Metals | ≤10 mg/kg | — |
| Arsenic | ≤2 mg/kg | — |
Data Source Note: The above data are from Guoli Chemical's OP-7 product factory inspection standards. Some data (such as surface tension and CMC) are typical values, and actual batches may have slight fluctuations. Please refer to the product COA for details.
OP-7 has an extremely wide range of applications. The following are typical uses in various fields and recommended dosage references:
Compounding Recommendation: OP-7 can be well compounded with anionic surfactants (such as LAS, AES, SDS) and cationic surfactants, remaining stable in both acidic and alkaline systems. Its HLB value of 11.7 makes it suitable as an O/W emulsifier, compatible with lower HLB surfactants.