Silico® PF8704 Silicone Diffusion Pump Fluid
Product Introduction:
Silico® PF8704 Silicone Diffusion Pump Fluid is a single-component fluid designed for high vacuum applications, ranging from 10^-6 to 10^-8 torr (untrapped) and 10^-10 to 10^-11 torr (trapped). Known for its low vapor pressure and thermal stability, it is widely used in vacuum coating, metallurgical processes, and other high-performance applications. Silico® PF8704 phenyl methyl silicone oil is equivalent to DowCorning’s DC-704 and Shin-Etsu’s HIVACF-4.
Technical Specifications:
| Property | Value |
|---|---|
| CAS No. | 3982-82-9 |
| EINECS No. | 223-620-5 |
| Formula | C28H32O2Si3 |
| Molecular Weight | 484.82 |
| Chemical Name | Tetramethyltetraphenyltrisiloxane |
| Color and Appearance | Colorless to straw-colored fluid |
| Ultimate Vacuum (untrapped) | 107 to 10-8 torr |
| Ultimate Vacuum (trapped) | 10-10 to 10^-11 torr |
| Extrapolated Vapor Pressure | 2 x 10^-8 torr at 25°C |
| Specific Gravity at 25°C | 1.07 |
| Refractive Index at 25°C | 1.550 – 1.560 |
| Viscosity at 25°C | 36 – 44 cSt |
| Flash Point (Open Cup) | 221°C |
| Boiling Point at 0.5 torr | 215°C |
| Typical Boiler Temperature | 220°C |
| Surface Tension | 37.3 dynes/cm |
| Heat of Vaporization | 25.5/250°C kcal/g mol |
Applications
Silico® PF8704 is used in various high-performance applications including:
Aerospace
Electronics
Metallurgy
Vacuum Coatings
Atomic Energy
Packaging and Storage
Packaging: 1Kg bottles, 5Kg, 25Kg pails, and 200Kg steel drums.
Shelf Life: 60 months when stored in original unopened packaging.
All technical data provided is based on current knowledge and experience. Users must test product suitability for intended applications.
No warranties are expressed or implied. Silico® assumes no liability for incidental or consequential damages.
Jessica G.
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