[Industry News] Deep within the columns of electron microscopes and along the beamlines of atomic accelerators, vacuum level directly dictates the resolution limit for observing matter and the signal-to-noise ratio of particle experiments. While standard diffusion pump oils (e.g., IOTA 702) suffice for the 10⁻⁵ Pa range, pushing into Ultra-High Vacuum (UHV) realms of 10⁻⁷~10⁻¹⁰ Pa for semiconductors and fundamental research demands fluids with even lower saturated vapor pressure. With burgeoning demands for "zero-contamination, long-cycle, and high-stability" vacuum environments in semiconductor front-end processes, TEM imaging, and quantum devices, sourcing a diffusion fluid that is "low enough in vapor pressure, rich enough in phenyl groups, and robust enough against radiation" has become a core proposition for large scientific apparatus and high-end manufacturing. Addressing this "ultra-high vacuum" pain point, IOTA (Anhui IOTA Silicone Oil Co., Ltd.) officially launches Ultra-High Vacuum Diffusion Pump Oil IOTA 705. Chemically identified as Pentaphenyl Trimethyl Trisiloxane (CAS 3390-61-2, MW 546), and characterized by "colorless transparency, high-viscosity stability of 170-175 cSt, and a saturated vapor pressure of <6.65×10⁻⁸ Pa," this product emerges as the "Ultra-High Vacuum Bloodstream" for electron microscopy, atomic accelerators, and high-vacuum coatings.

Molecular Precision: The Anti-Interference Barrier of High Phenyl Density

The core competitiveness of IOTA 705 stems from the high-density grafting of five phenyl groups onto its siloxane backbone, simultaneously maximizing "low volatilization" and "radiation resistance":

• Ultimate Low Vapor Pressure (<6.65×10⁻⁸ Pa): The rigid π-bond structure of the phenyl groups significantly suppresses molecular thermal motion and outward diffusion. Its saturated vapor pressure at 25°C drops to <6.65×10⁻⁸ Pa (approx. 3×10⁻¹⁰ Torr), with an ultimate vacuum of <6.65×10⁻⁷ Pa (no cold trap needed). This means the system can be pumped to the 10⁻⁷~10⁻¹⁰ Torr range solely relying on the oil's intrinsic properties,彻底 (completely) eliminating the industry's nightmare of "backstreaming contamination on wafers/samples."
• Dual Shield: High Thermal & Oxidation Stability: Boasting an open-cup flash point of ≥243°C and a freezing point of ≤-14~-18°C, coupled with the intrinsic oxidation resistance of the siloxane skeleton, it operates without cracking or coking at boiler temperatures exceeding 300°C. It even retards aging and minimizes sludge formation in the event of minor air ingress.
• High-Viscosity Stable Circulation (170-175 cSt): Significantly more viscous than IOTA 702 (~75-140 cSt) and 704 (~38 cSt), it offers a slower start-up warm-up but provides a lower backstreaming rate and more stable liquid film inside the pump. This is particularly suited for large-aperture diffusion pumps and long-cycle, uninterrupted operation in scientific research facilities.

Application Penetration: From Microscopic Resolution to Particle Exploration

The application boundaries of IOTA 705 are locked onto the most background-sensitive cutting-edge fields:

• Electron Microscopy: Providing a hydrocarbon-free column vacuum for SEMs/TEMs, ensuring atomic-level imaging is free from oil vapor interference.
• Atomic Accelerators & Mass Spectrometers: Maintaining UHV in particle beam pipelines to reduce the impact of background pressure on beam transmission efficiency, while achieving lower background noise in mass spectrometry analysis.
• High-Vacuum Coatings & Displays: Used in optical coatings, AR/VR lens coatings, and OLED evaporation chambers to prevent pinholes and color shifts in films caused by silicone backstreaming.
• High-Vacuum Metallurgy: Ensuring metallurgical purity during the degassing of rare-earth and refractory metals by maintaining a pristine vacuum environment.

The IOTA Quality DNA: Full Specifications, Non-Hazardous, Long Life

• Full Specification Coverage: Available in 1kg plastic bottles (laboratory), 5kg/25kg/50kg plastic drums (pilot scale), and 200kg iron drums (mass production lines), flexibly catering to scenarios from research groups to wafer fabs.
• Non-Hazardous Logistics: Classified as non-hazardous for transport and storage. Store in moisture-proof, light-protected warehouses within an allowed temperature range of -40~50°C, with a 3-year shelf life.
• Import Equivalent: The molecular structure is identical to Dow Corning 705 / international brand 705 (same CAS 3390-61-2), enabling seamless replacement, domestic supply, and shorter lead times.

Industry Expert Insight: Experts note that amid the wave of EUV lithography, quantum bit encapsulation, and TEM localization, UHV fluids are no longer mere "consumables" but "functional materials" dictating the ultimate specifications of the instruments themselves. The launch of IOTA 705 not only completes the domestic portfolio for pentaphenyl trisiloxane at the highest echelon but also provides research institutes and large scientific facilities with a secure path to摆脱 (break free from) import dependency through its "isostructural equivalence and local delivery" strategy. This milestone signifies that domestic silicon-based vacuum fluids now possess the strength to compete globally in the UHV arena.