SiSiB® PF8705 Silicone Diffusion Pump Fluid is a single component fluid designed for ultrahigh vacuum applications in the range of 10-9 to 10-10 torr (untrapped) and 10-11 torr (trapped).
The low vapor pressure, low back-streaming rate and the high resistance to oxidation and radiation make this silicone fluid ideal for many ultrahigh vacuum applications such as those in mass spectrometers and electron microscopes. It has the highest phenyl content of all silicone diffusion pump fluids and the best resistance to radiation. High spontaneous ignition temperature makes this fluid ideal for use in human-rated space simulation chambers.
SiSiB® PF8705 silicone diffusion pump oil is equal to DowCorning’s DC-705, Shin-Etsu’s HIVACF-5.