Chemical composition: Tetramethyl tetraphenyl trisiloxane
Ultimate Vacuum, torr (untrapped): 10-7~10-8
Saturated Vapor Pressure, torr : 5x10-8
Specific Gravity: 1.06 ~ 1.07
Viscosity (25°C), cSt: 38±3
Flash Point °C: ≥210
Refractive Index 25°C: 1.5500~1.5600
Congealing Point °C: -35
Molecular Description: 484
Silicone Diffusion Pump Oil IOTA 704-IOTA (phenylsilicone.com)