Emulsifier OS (CAS: 68439-50-9, also known as AEO/Peregal/fatty alcohol polyoxyethylene ether) has the chemical name sodium sec-alkyl sulfonate. It appears as a light yellow to yellowish brown oily liquid and belongs to the nonionic/anionic surfactant type. Its core advantage lies in its extremely strong emulsifying power, enabling rapid formation of stable emulsion systems in either aqueous or oil phases. At the same time, it exhibits excellent wetting, penetration, and dispersing properties, effectively reducing surface tension and preventing active ingredient aggregation. OS has outstanding hard water resistance and good electrolyte stability, making it particularly reliable in pesticide formulations under high-salt or complex water conditions.
Emulsifier MS-1 has the chemical name octylphenol polyoxyethylene ether maleate and appears as a brownish red viscous liquid. MS-1 possesses excellent comprehensive emulsifying performance, compatible with various oil phase systems. Its wetting and spreading properties are prominent, significantly enhancing the spreadability of the spray liquid on target surfaces. Its dispersing and stabilizing effects are long-lasting, delaying formulation stratification, and it has excellent compatibility with various pesticide technical materials and solvents, making it an ideal choice for constructing complex multi-component systems. According to current chemical classification standards, MS-1 is classified as a low-risk chemical with no hazard classification, and its handling safety is superior to that of OS.
The following is a comparison of key technical indicators for emulsifiers OS and MS-1 (data source: Guoli Chemical product database):
| Parameter Item | Emulsifier OS | Emulsifier MS-1 |
|---|---|---|
| Chemical Type | Sodium sec-alkyl sulfonate (nonionic/anionic) | Octylphenol polyoxyethylene ether maleate |
| Appearance (25°C) | Light yellow to yellowish brown oily liquid | Brownish red viscous liquid |
| HLB Value | 12-14 | |
| Cloud Point | No cloud point | Approx. 65-75°C (1% aqueous solution) |
| Active Content | ≥99% | |
| pH (1% aqueous solution) | 5.5~7.5 | |
| Surface Tension (1% aqueous solution, 25°C) | Approx. 30-35 mN/m | |
| Penetration Power (1% aqueous solution, canvas disc method) | Approx. 5-15 seconds | |
| Moisture Content | ≤1.0% | |
| Flash Point (closed cup) | >150°C | |
| Acid Value | ≤1.0 mg KOH/g | |
| Specific Gravity (25°C) | Approx. 0.95-1.05 g/cm³ | |
| GHS Hazard Classification | Skin corrosion/irritation Category 2; Serious eye damage/irritation Category 2 (H315, H319) | No hazard classification |
Emulsifiers OS and MS-1 each have their own emphasis in pesticide formulation processing. Proper combination can achieve optimal results: