Silicone Fluids - Diffusion Pump Fluid

SiSiB® PF8704

1,1,5,5-Tetraphenyl-1,3,3,5-tetramethyltrisiloxane


Chemical Structure


Introduction

SiSiB® PF8704 Silicone Diffusion Pump Fluid is a single component fluid designed for high vacuum applications in the range of 10-6 to 10-8 torr (untrapped) and 10-10 to 10-11 torr (trapped).

Its low vapor pressure and thermal stability make it popular in processes such as vacuum coating, metallurgical work, and various other applications.

SiSiB® PF8704 is equal to DowCorning’s DC-704, Shin-Etsu’s HIVACF-4.


Typical Physical Properties

Product: SiSiB®PF8704
CAS No.: 3982-82-9
EINECS No. 223-620-5
Formula C28H32O2Si3
Molecular Weight: 484.82
Color and Appearance: Colorless to straw-colored fluid
Ultimate Vacuum, torr 10-7 to 10-8 untrapped
  10-10 to 10-11 trapped
Extrapolated Vapor Pressure, torr, 25°C 2 x 10-8
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, 0.5 torr 215°C
Typical Boiler Temperature 220°C
Surface Tension, dynes/cm 37.3
Heat of Vaporization, kcal/g mol 25.5/250°C

Applications

SiSiB® PF8704 Diffusion Pump Fluid can be used in a variety of applications including: Aerospace, Electronics, Metallurgy, Vacuum Coatings, and Atomic Energy etc.


Packings

SiSiB® PF8704 is supplied in 5Kg pail, 25Kg pail, 200Kg steel drum, for more details, please visit Packing Centre.

Technical Library

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