Overview

Silicone Diffusion Pump Oil IOTA 705, also known by its synonyms such as 1,1,3,5,5-Pentaphenyl-1,3,5-trimethylsiloxane and 705 Super high vacuum diffusion pump oil, is a specialized fluid designed for use in ultrahigh vacuum applications. With a CAS number of 3390-61-2, this oil is a colorless transparent, single-component liquid that offers exceptional performance in achieving and maintaining vacuum levels in the range of 5x(10-9~10-10) torr (untrapped). Its unique chemical composition and properties make it an ideal choice for a wide range of industries requiring high vacuum conditions.

Technical Specifications

The chemical composition of Diffusion Pump Oil IOTA 705 is Pentaphenyl trimethyl trisiloxane, which contributes to its superior vacuum-creating capabilities. Its ultimate vacuum level, when untrapped, can reach as low as 1x(10-9~10-10) torr. With an extrapolated vapor pressure of 3x10-10 at 25°C (77°F), this oil exhibits extremely low volatility, ensuring stable vacuum conditions over time. Additional technical specifications include a specific gravity of 1.090 ~ 1.100, a viscosity range of 170~175 cSt at 25°C and 61~64 cSt at 40°C, a flash point of ≥243°C, and a refractive index of 1.5765~1.5785 at 25°C. These specifications combined make IOTA 705 a robust and reliable choice for high-vacuum applications.