Dow Corning 704 Diffusion Pump Fluid is a single-component fluid for high vacuums of 10-6 to 10-8 torr (untrapped) and 10-10 to 10-11 torr (trapped). It performs well in tough, rugged appli-cations and offers quick pumpdown, even after exposure to air at operating temperatures. Dow Corning 705 Diffusion Pump Fluid is a colorless to straw .