Product Description of Poly(propylene glycol) CAS No. 25322-69-4
Poly(propylene glycol) is a polymer with the molecular formula H(C₃H₆O)ₙOH. It is a colorless to pale yellow, viscous liquid that is non-volatile and non-corrosive. Commercially available products typically have molecular weights ranging from 400 to 2,050. Lower molecular weight grades are water-soluble, whereas higher molecular weight grades have limited water solubility but are readily soluble in oils, various hydrocarbons, aliphatic alcohols, ketones, and esters.
With hydroxyl groups at both ends of the molecule, it can undergo esterification reactions to form monoesters or diesters. Monoesters can serve as non-ionic surfactants and can further react with alcohols to form ethers. Poly(propylene glycol) acts as a solvent for vegetable oils, resins, and paraffin wax, and is widely used in the production of alkyd resins, emulsifiers, demulsifiers, lubricants, and plasticizers. It is produced through the condensation of propylene oxide and propylene glycol under high pressure or in the presence of an acidic catalyst.
Chemical Properties
| Melting point | -40 °C |
| Boiling point | >300 °C |
| density | 1.01 g/mL at 20 °C |
| vapor density | >1 (vs air) |
| Pour Point | -26 |
| Pour Point | -45 |
| vapor pressure | <0.01 mm Hg ( 20 °C) |
| refractive index | n20/D 1.451 |
| Fp | 230 °C |
| solubility | H2O: <0.01 % (w/w) at 25 °C |
| form | Viscous Liquid |
| Specific Gravity | 1.005 |
| color | White to light gray |
| Water Solubility | PRACTICALLY INSOLUBLE |
| FreezingPoint | -25 |
| FreezingPoint | -40 |
| Stability: | Stable. Substances to be avoided include strong oxidizing agents. |
| LogP | 0.01 at 25℃ |
| NIST Chemistry Reference | Polypropylene glycol 425(25322-69-4) |
| EPA Substance Registry System | Polypropylene glycol (25322-69-4) |
| Safety Statements | 24/25 |
| WGK Germany | 1 |
| RTECS | TR5250000 |
| TSCA | Yes |
| HS Code | 39072090 |
| Hazardous Substances Data | 25322-69-4(Hazardous Substances Data |
Product Application
Poly(propylene glycol) is widely used in polymer science and the organic chemical industry, particularly in polymers, hydrophobic polymer materials, and related organic substances. It serves as a professional reagent, biochemical reagent, and chemical raw material in various research and industrial fields.
As part of the polypropylene glycol (PPG) series—including grades such as PPG-400, PPG-1000, PPG-2000, and PPG-4000—it is applied in food processing additives, food additives, and defoaming agents, as well as in pesticide formulations and cosmetic raw materials.
Poly(propylene glycol) is also utilized as an active pharmaceutical ingredient and as an intermediate in pharmaceutical, pesticide, and dye manufacturing. In addition, it functions as a solvent and organic raw material in the production of alcohol-based chemicals and other organic chemical products across multiple industrial applications.
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