Polyether L-35 (international common name: Poloxamer 105, CAS: 68439-50-9) is a block copolymer of ethylene oxide (EO) and propylene oxide (PO) with a molecular weight of approximately 1900. It belongs to the category of difunctional nonionic surfactants. Its unique EO/PO block structure imparts low foaming and high dynamic wetting characteristics, enabling rapid reduction of surface tension in aqueous systems with minimal foam generation.
The pH value of this product is neutral (5.0~7.5), with a cloud point as high as 73~77°C, maintaining activity even under high-temperature conditions. It has extremely high purity (active content ≥99%), low free alcohol content (≤0.5%), and both the acid value and iodine value are controlled at very low levels, indicating stable chemical properties and resistance to oxidative degradation. Its density is approximately 1.05~1.06 g/cm³, and the solidification point is below 0°C, remaining liquid at room and low temperatures for convenient handling.
In terms of safety, Polyether L-35 exhibits extremely low toxicity (oral LD₅₀ in rats >5 g/kg), is non-irritating to the skin, and causes only minimal eye irritation. Its flash point is >100°C, and it is not classified as a hazardous chemical, making it very safe under normal industrial handling conditions.
| Parameter | Specification/Value | Test Condition |
|---|---|---|
| CAS No. | 68439-50-9 | — |
| Chemical Name | Ethoxylated propoxylated C12-14 alcohols | — |
| Molecular Formula | R(OCH₂CH₂)x(OCH₂CH(CH₃))yOH (R=C12-14 alkyl) | — |
| Molecular Weight | Approximately 1900 | — |
| Appearance | Colorless to pale yellow transparent liquid | Room temperature |
| Ionic Type | Nonionic | — |
| Active Content | ≥99% | — |
| pH Value | 5.0~7.5 | 1% aqueous solution, 25°C |
| HLB Value | 18~23 | — |
| Cloud Point | 73~77°C | 1% aqueous solution |
| Density | 1.05~1.06 g/cm³ | 25°C |
| Kinematic Viscosity | Approximately 285 mm²/s | 25°C |
| Low-Shear Viscosity | Approximately 300 mPa·s | 25°C |
| Refractive Index | Approximately 1.452 | 25°C |
| Surface Tension | Approximately 40 mN/m | 1% aqueous solution |
| Critical Micelle Concentration | Approximately 0.1% (w/v) | — |
| Hydroxyl Value | 45~56 mgKOH/g | — |
| Acid Value | ≤0.3 mgKOH/g | — |
| Saponification Value | ≤1 mgKOH/g | — |
| Iodine Value | ≤1 | — |
| Unsaturation | ≤0.1 mol/kg | — |
| Moisture Content | ≤0.5% | — |
| Free Alcohol | ≤0.5% | — |
| Solidification Point | <0°C (Liquid) | — |
| Flash Point | >100°C | — |
| Solubility | Soluble in water, ethanol, ether and other organic solvents | — |
| Foam Characteristic | Low foaming | — |
| Alkali Resistance | Good | — |
| Heavy Metals (as Pb) | ≤10 mg/kg | — |
| Arsenic Content | ≤2 mg/kg | — |
Due to its high HLB value (18~23), extremely low foaming, and moderate cloud point, Polyether L-35 is particularly suitable for the following scenarios: