Polyethylene Glycol PEG-200 (CAS: 25322-68-3) is a pure substance, not a mixture. Its chemical name is α-Hydro-ω-hydroxypoly(oxy-1,2-ethanediyl), and its general molecular formula can be expressed as HO-(CH₂CH₂O)n-H, where n represents the degree of polymerization of ethylene oxide.
The "200" in PEG-200 indicates its average molecular weight of approximately 200. This product is prepared by the polymerization of ethylene oxide with water or ethylene glycol, and the molecular chain has one hydroxyl group (-OH) at each end, imparting good hydrophilicity and chemical reactivity. As a typical non-ionic surfactant, the ether bonds (C-O-C) and terminal hydroxyl groups in its molecular structure together determine its excellent solubilizing, emulsifying, and moisturizing properties.
According to the Safety Data Sheet, PEG-200 is explicitly classified as a "substance" rather than a "mixture", with a single component and no other additives or solvents. Its purity is usually high, and the main technical indicators include hydroxyl value, water content, acid value, etc.
| Parameter | Description |
|---|---|
| Chemical Name | α-Hydro-ω-hydroxypoly(oxy-1,2-ethanediyl) |
| CAS No. | 25322-68-3 |
| Molecular Formula (General) | HO-(CH₂CH₂O)n-H |
| Average Molecular Weight | Approximately 190-210 |
| Substance Type | Single substance (not a mixture) |
| Appearance | Colorless transparent viscous liquid |
| Ionic Type | Non-ionic type |
Due to its single component, high purity, and stable chemical properties, PEG-200 is widely used as:
PEG-200 is hygroscopic. During storage, keep the container sealed and store in a cool, dry place (recommended 15°C to 30°C) to prevent moisture absorption that may affect purity. Although its toxicological safety is high (acute oral LD50 > 2000 mg/kg, classified as low toxicity), it is still recommended to wear basic protective equipment during handling and avoid prolonged contact with eyes and skin.