Product Details
Polypropylene glycol (PPG) is manufactured using various catalytic systems, including potassium hydroxide (KOH) and double metal cyanide (DMC) catalysts. Production technologies range from conventional semi-continuous reactor processes to advanced microchannel reactor systems, offering flexibility in process design and production efficiency. Under specific laboratory-scale conditions, such as a reaction temperature of approximately 190°C and a pressure of around 2 MPa, propylene oxide conversion can reach up to 63.5%, with the resulting PPG exhibiting molecular weights in the range of 600–650. Actual conversion rates, molecular weight distribution, and product properties depend on catalyst selection, operating conditions, and reactor configuration.
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 |
| Storage temp | Storage temp. 2-8°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) |
Product Usage
Polypropylene glycol (PPG) is a versatile chemical widely utilized across industrial, food-related, and pharmaceutical applications. Its adjustable molecular weight allows its physical and functional properties to be tailored to specific requirements, including lubrication, solubilization, foam control, and moisture retention. In addition, its favorable compatibility with various ingredients and materials makes it suitable for incorporation into diverse formulation systems. These characteristics enable PPG to serve multiple functions across different industries, supporting applications that require customized performance, formulation flexibility, and consistent product quality.
