IVP 704 is a silicone diffusion pump fluid that is our substitute for discontinued Dow Corning DC-704. A clear, tetramethyltetra-phenyltrisiloxane, single-component fluid for high vacuums of 10-7 to 10-8 torr range (untrapped) and 10-11 (trapped).This fluid's low vapor pressure and thermal stability make it popular in processes such as vacuum coating, metallurgical work, and various other applications. Excellent for most model Diffusion pumps. Sold also on this website in 1 Liter, 1 Gallon, 5 Gallon.