Rubailing/O-8 (fatty alcohol polyoxyethylene (8) ether, CAS No. 68439-49-6) appears as a milky white to light yellow paste and belongs to the nonionic surfactant category. Its molecular weight is approximately 530~560, with an active matter content of ≥99%, ensuring high purity and high efficiency of the product. The product exhibits excellent chemical stability, remaining stable in acid, alkali, and high-concentration electrolyte salt solutions, with outstanding hard water resistance.
The hydrophilic-lipophilic balance (HLB) value of this product is 11-12, which is in the golden range of amphiphilicity, making it easily soluble in oil and dispersible in water, exhibiting excellent emulsification, solubilization, and dispersion capabilities. Its cloud point is 50~70°C (1% aqueous solution), suitable for processes requiring high-temperature treatment. The surface tension is approximately 28~32 mN/m, and the critical micelle concentration (CMC) is as low as 0.02~0.05 g/L, indicating that it can significantly reduce the interfacial energy of the system at very low concentrations, achieving efficient wetting and penetration.
In terms of safety indicators, the acid value of the product is ≤1.0 mgKOH/g, iodine value ≤2 gI₂/100g, hydroxyl value controlled at 90~105 mgKOH/g, moisture content ≤1.0%, and free alcohol content ≤1.0%. These parameters strictly ensure the purity and stability of the product. The heavy metal content is ≤20 mg/kg (calculated as Pb), and arsenic content ≤2 mg/kg, meeting the safety standards for fine chemical products.
| Parameter Category | Parameter Name | Technical Indicator |
|---|---|---|
| Basic Information | Chemical Name | Fatty alcohol polyoxyethylene (8) ether (C12-14 pareth-8) |
| Basic Information | CAS Number | 68439-49-6 |
| Basic Information | Ion Type | Nonionic |
| Physical Form | Appearance | Milky white to light yellow paste |
| Physical Form | Congelation Point | Approximately 10~15°C |
| Physical Form | Density (20°C) | 0.99~1.01 g/cm³ |
| Physical Form | Kinematic Viscosity (25°C) | Approximately 60~80 mm²/s |
| Physical Form | Refractive Index (20°C) | 1.450~1.460 |
| Physical Form | Flash Point | >150°C |
| Core Functional Parameters | HLB Value | 11~12 |
| Core Functional Parameters | Cloud Point (1% aqueous solution) | 50~70°C |
| Core Functional Parameters | Surface Tension (1% aqueous solution, 25°C) | Approximately 28~32 mN/m |
| Core Functional Parameters | Critical Micelle Concentration (25°C) | 0.02~0.05 g/L |
| Core Functional Parameters | Penetration Power (0.1% aqueous solution, 25°C, canvas settling method) | Approximately 15~30 seconds |
| Core Functional Parameters | Foaming Property | Moderate foam |
| Chemical Indicators | Active Matter Content | ≥99% |
| Chemical Indicators | pH Value (1% aqueous solution) | 5.0~7.0 |
| Chemical Indicators | pH Value (5% aqueous solution) | 5.0~7.0 |
| Chemical Indicators | Acid Value | ≤1.0 mgKOH/g |
| Chemical Indicators | Hydroxyl Value | 90~105 mgKOH/g |
| Chemical Indicators | Iodine Value | ≤2 gI₂/100g |
| Chemical Indicators | Moisture | ≤1.0% |
| Chemical Indicators | Free Alcohol | ≤1.0% |
| Chemical Indicators | Heavy Metals (as Pb) | ≤20 mg/kg |
| Chemical Indicators | Arsenic (As) | ≤2 mg/kg |
| Solubility and Stability | Solubility | Easily soluble in oil, dispersible in water |
| Solubility and Stability | Chemical Stability | Stable in acid, alkali, and salt solutions |
| Solubility and Stability | Hygroscopicity | Hygroscopic |
The HLB value of 11-12 for Rubailing/O-8 makes it highly suitable as an O/W emulsifier. In formulation design, it can be compounded with other nonionic or anionic surfactants to flexibly adjust the HLB value of the system to meet the emulsification requirements of different oil phases. Typical applications include: textile scouring agents and detergents (dosage 2%~8%), pesticide emulsifiable concentrate emulsifiers (dosage 5%~15%), industrial hard surface cleaners (dosage 3%~10%), emulsion polymerization emulsifiers (dosage 1%~5% based on monomer mass), and base components of metalworking fluids (dosage 5%~20%).
Since the congelation point of the product is approximately 10~15°C, solidification or stratification may occur at low temperatures in winter, which is a normal physical phenomenon. Before use, rewarm at 20~30°C and stir evenly to restore performance, without affecting product quality. In processes requiring high-temperature operation, its cloud point of 50~70°C ensures that surface activity is not lost.