Polyethylene glycol PEG-8000 (CAS No.: 25322-68-3) is a high-quality non-ionic surfactant produced by Guoli Chemical. It appears as a white waxy solid or free-flowing powder. Its molecular formula is HO(C2H4O)nH, with a degree of polymerization n of approximately 70~200 and a molecular weight range of 7000~9000. The product has a content of 99% or higher, with excellent solubility, chemical stability, and biocompatibility.
\nThe HLB value of this product is as high as 19.3, making it a strongly hydrophilic surfactant. It has extremely high solubility in water, forming a clear and transparent solution. Its melting point range is 55~63°C, refractive index is 1.453~1.457 (measured at 70°C), and density is 1.15~1.20 g/cm³ (25°C). The low shear viscosity of a 5% aqueous solution is approximately 5 mPa·s (25°C), with a flash point greater than 240°C. It is a low-foaming product with extremely low foamability.
\nIn terms of quality indicators, the acid value of PEG-8000 is controlled below 0.5, saponification value is less than 1, moisture content does not exceed 1.0%, free alcohol content does not exceed 0.1%, and heavy metals and arsenic contents are controlled below 10 mg/kg and 2 mg/kg respectively. These strict quality control parameters ensure the product's applicability in high-demand fields such as pharmaceuticals, cosmetics, and biotechnology.
\n\n| Parameter Category | Parameter Name | Specification/Value |
|---|---|---|
| Basic Information | CAS No. | 25322-68-3 |
| Molecular Formula | HO(C2H4O)nH, n≈70~200 | |
| Physical Properties | Appearance | White waxy solid |
| Molecular Weight | 7000~9000 | |
| Melting Point | 55~63°C | |
| Physicochemical Indicators | Hydroxyl Value | 12~16 mgKOH/g |
| Acid Value | ≤0.5 mgKOH/g | |
| Saponification Value | <1 | |
| Iodine Value | <1 | |
| Unsaturation | Saturated | |
| Solution Properties | pH of 1% Aqueous Solution | 5.0~7.0 |
| pH of 5% Aqueous Solution | 4.5~7.5 | |
| Viscosity of 5% Aqueous Solution (25°C) | Approximately 5 mPa·s | |
| Surface Properties | HLB Value | 19.3 |
| Surface Tension | 63~68 mN/m | |
| Purity Indicators | Active Content/Solid Content | ≥99% |
| Moisture | ≤1.0% | |
| Free Alcohol | ≤0.1% | |
| Optical and Thermal | Refractive Index (70°C) | 1.453~1.457 |
| Flash Point | >240°C | |
| Other Characteristics | Density (25°C) | 1.15~1.20 g/cm³ |
| Cloud Point | >100°C | |
| Safety Indicators | Heavy Metals | ≤10 mg/kg |
| Arsenic | ≤2 mg/kg | |
| Ion Type | Ion Type | Non-ionic |
| Solubility | Solubility | Easily soluble in water |
| Foam Performance | Foam Performance | Low foaming |
| Hygroscopicity | Hygroscopicity | Slightly hygroscopic |
| Chemical Stability | Chemical Stability | Stable, avoid contact with strong oxidizing agents |
| Alkali Resistance | Alkali Resistance | Stable against alkalis |
| Packaging Specifications | Packaging | 200 kg iron drum, 50 kg plastic drum |
Based on the above technical parameters, PEG-8000 has significant advantages in the following scenarios: In the pharmaceutical field, its high purity and low acid value ensure safety as an ointment base and tablet excipient; in biotechnology, the molecular weight range of 7000~9000 is particularly suitable for protein precipitation and crystallization operations; in cosmetic formulations, the HLB value of 19.3 with strong hydrophilicity makes it an ideal O/W emulsion stabilizer; in industrial applications, its excellent lubricity and chemical stability make it suitable for metalworking fluids and rubber mold release agents.
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