The Challenge of Ultrahigh Vacuum Performance

In vacuum technology, the difference between success and failure often comes down to contamination, instability, and inconsistent pressure control. Achieving ultrahigh vacuum is not simply a matter of running a pump; it requires a fluid that can maintain low vapor pressure, resist degradation, and perform reliably over extended operating cycles. Silicone Diffusion Pump Oil IOTA 705 is formulated to meet this challenge. As a colorless, transparent, single-component diffusion pump fluid, it is designed for applications where vacuum integrity must be preserved at the highest practical level.

Designed for Demanding Vacuum Environments

IOTA 705 is intended for ultrahigh vacuum applications in the range of 5×10⁻⁹ to 10⁻¹⁰ torr (untrapped), with an ultimate vacuum capability of 1×10⁻⁹ to 10⁻¹⁰ torr (untrapped). These figures indicate that the fluid is suitable for systems where even minute vapor contributions can affect process quality. Its extrapolated vapor pressure at 25°C, listed as 3×10⁻¹⁰ torr, further supports its use in sensitive vacuum environments. The fluid’s chemical identity is closely linked to pentaphenyl trimethyl trisiloxane, a silicone-based composition that contributes to its stability and performance. Known synonyms include 1,1,3,5,5-pentaphenyl-1,3,5-trimethylsiloxane, 705 super high vacuum diffusion pump oil, 705 diffusion pump fluid, phenylmethylsiloxane oligomers, and oil for diffusion pump. These names reflect its role as a specialized fluid for high-performance vacuum pumping.

Performance Data That Matters

A diffusion pump fluid must be judged by measurable technical characteristics. IOTA 705 offers a specific gravity of 1.090–1.100, a viscosity of 170–175 cSt at 25°C, and a viscosity of 61–64 cSt at 40°C. These values indicate a fluid with sufficient body to support stable pump operation while remaining manageable during handling and maintenance. The flash point of ≥243°C is particularly important for industrial safety. It suggests that the fluid can tolerate elevated operating temperatures without approaching unsafe conditions. The congealing point of ≤-14 to -18°C also ensures that the fluid remains functional in cooler environments, making it suitable for laboratories and production facilities with varying ambient conditions.

Broad Industrial Relevance

IOTA 705 is especially valuable because it serves multiple industries rather than being limited to a single niche. In the electrical and electronics industry, it supports vacuum processes for TV tubes, fluorescent tubes, cathode ray tubes, ordinary bulbs, capacitors, and rectifier metallized film vacuum systems. In the optical industry, it is used for anti-reflective coatings, optical filters, mirrors, and surface improvements. In metallurgy, the fluid supports high-vacuum furnaces, melting, degassing, sintering of refractory metals, and thick-film deposition. In the plastics industry, it contributes to mirror coatings, protective coatings, film coatings, and surface improvements. It is also used in accelerators, molecular plants, R&D plants, mass spectrometry, and metal and fuel processing. Additionally, it can function as a transmission fluid in high-temperature carriers and various instruments.

Practical Packaging and Storage

For users, practical handling is just as important as technical performance. IOTA 705 is supplied in 1 kg plastic bottles, 1-gallon plastic drums, 5 kg plastic drums, 25 kg plastic drums, 25 kg iron drums, and 200 kg iron drums. This range allows laboratories, pilot plants, and industrial users to select the most appropriate package size for their needs. The product should be transported as a non-hazardous chemical and kept away from rain and sunlight. Proper storage helps preserve its chemical integrity and operational performance. With a shelf life of 3 years, IOTA 705 offers a practical balance between performance reliability and inventory flexibility.

A Dependable Choice for Vacuum System Users

For any facility relying on diffusion pumps, the working fluid is not an afterthought. It directly influences vacuum quality, maintenance intervals, and process consistency. Silicone Diffusion Pump Oil IOTA 705 provides a strong combination of ultrahigh vacuum capability, thermal stability, and industrial versatility. From optical coating systems to vacuum furnaces, from analytical instruments to electronics manufacturing, IOTA 705 repre

Silicone Diffusion Pump Oil IOTA 705 （Replacement for DC705）-IOTA