PEG400MO (CAS No.: 9004-96-0), chemically known as Polyethylene Glycol 400 Monooleate, also referred to as PEG-8 Monooleate, has a molecular formula of C₁₇H₃₃COO(CH₂CH₂O)ₙH (n≈8~9) and a molecular weight of approximately 600. The product appears as a light yellow to amber transparent oily liquid and belongs to the category of nonionic surfactants. Its molecular structure combines hydrophilic polyoxyethylene segments with the hydrophobic long chain of oleic acid, endowing the product with excellent amphiphilic properties.
This product has stable physicochemical properties and is not prone to deterioration under recommended storage conditions. It is hygroscopic and should be stored in an airtight container to prevent moisture absorption. It is readily soluble in water, ethanol, acetone, and other polar solvents, forming a clear to slightly milky solution in water. Due to its nonionic nature, it maintains stable surface activity under acidic, alkaline, and high-hardness water conditions, and exhibits good compatibility with anionic, cationic, and amphoteric surfactants. Low temperatures (< 5°C) may cause the product to solidify or thicken, which is a physical change; normal consistency can be restored by gentle warming and stirring.
The product has excellent safety profile: acute oral toxicity LD₅₀ >5,000 mg/kg (rat), acute dermal toxicity LD₅₀ >2,000 mg/kg (rabbit), primary irritation index (PII) of 0.0 in skin irritation tests (non-irritating); it may cause slight transient eye irritation. It has low toxicity to aquatic organisms (zebrafish 96h LC₅₀ and Daphnia magna 48h EC₅₀ both >100 mg/L), meeting environmental requirements.
The following are the main physicochemical and technical parameters of PEG400MO (Polyethylene Glycol 400 Monooleate), sourced from the Guoli Chemical product database:
| Parameter | Specification/Value | Parameter | Specification/Value |
|---|---|---|---|
| Appearance | Light yellow to amber liquid | Melting Point | < -10 °C |
| Ionic Type | Nonionic | Flash Point (Closed Cup) | >200 °C |
| HLB Value | 11.5 | Density | 1.11~1.13 g/cm³ |
| Cloud Point | 50~70 °C | Kinematic Viscosity | Approx. 80~120 mm²/s |
| Active Content | ≥99% | Refractive Index | 1.466~1.468 |
| pH (1% Aqueous Solution) | 5.0~7.0 | Surface Tension | Approx. 32 mN/m |
| pH (5% Aqueous Solution) | 4.5~7.5 | Critical Micelle Concentration (CMC) | Approx. 0.05 g/L |
| Acid Value | ≤5 mgKOH/g | Iodine Value | 70~90 gI₂/100g |
| Saponification Value | 80~100 mgKOH/g | Hydroxyl Value | 85~105 mgKOH/g |
| Moisture Content | ≤1.0% | Degree of Unsaturation | Approx. 1.67 mol/kg |
| Monoester Content | ≥90% | Diester Content | <10% |
| Free Alcohol | ≤1% | Foam Characteristics | Low foaming |
| Heavy Metals (as Pb) | ≤10 ppm | Arsenic (As) | ≤2 ppm |
| Solubility | Readily soluble in water, ethanol, acetone | Hygroscopicity | Hygroscopic |
| Chemical Stability | Stable, avoid strong acids, strong bases, and strong oxidizing agents | Alkali Resistance | Moderate, hydrolyzes in strong alkali |
| Packaging Specification | 20 kg woven bag | Recommended Storage Temperature | 5°C~40°C |
Based on the HLB value (11.5) and physicochemical characteristics of PEG400MO, this product is particularly suitable for O/W (oil-in-water) emulsion systems. In cosmetics and personal care products, it is recommended for use in creams, lotions, makeup removers, and facial cleansers at a dosage of 1% to 5% of the total formulation, providing stable emulsification and a silky skin feel. In textile auxiliaries, when used as a spinning oil and softener component, the recommended dosage is 3% to 10%. In metalworking fluids, as an emulsifying and lubricating component, the recommended dosage is 5% to 15%. In pesticide formulations such as emulsifiable concentrates and suspension concentrates, using 5% to 20% of the pesticide active ingredient can significantly enhance emulsification, dispersion, and spray liquid adhesion. In coatings, inks, and industrial cleaning applications, the dosage can be flexibly adjusted within the range of 1% to 8% based on specific formulation needs.