In the scientific research and industrial fields with extremely strict requirements for vacuum environments, the ultra-high vacuum (UHV) diffusion pump oil IOTA705 (domestic grade 275) has stably served key equipment such as electron microscopes, high-vacuum coating equipment, accelerators and special light sources for many years, relying on its extremely low saturated vapor pressure and excellent thermal stability, making it a mature option among domestic high-performance vacuum media.
IOTA705 is a colorless and transparent oily liquid, with main technical indicators as follows:
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Kinematic viscosity at 25℃: 170–175 mm²/s
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Refractive index (25℃): 1.5765–1.5785
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Relative density (25℃): 1.090–1.10
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Flash point (open cup): ≥243 °C
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Freezing point: –14 °C to –18 °C
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Saturated vapor pressure: < 3 × 10⁻¹⁰ torr
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Ultimate vacuum: < 1 × 10⁻⁹ to 10⁻¹⁰ torr
These characteristics make it particularly suitable for systems that need to maintain an ultra-high vacuum (UHV) environment for a long time. Its extremely low vapor pressure effectively reduces oil return and background pollution, while its good oxidation resistance ensures long-term stability under high-temperature operating conditions.
Currently, IOTA705 has been applied in many domestic scientific research institutions, semiconductor equipment manufacturers and vacuum coating enterprises. Typical scenarios include:
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Vacuum systems of transmission/scanning electron microscopes (TEM/SEM)
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Beam pipes of particle accelerators in high-energy physics experiments
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High-vacuum evaporation equipment for OLED and photovoltaic devices
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Exhaust and sealing processes of special electric light sources (such as high-power xenon lamps, ultraviolet lamps)
User feedback shows that after continuous operation for hundreds of hours, IOTA705 can still maintain stable vacuum degree without obvious cracking or carbon deposition, and its maintenance cycle is better than that of some traditional mineral-based pump oils.
The manufacturer stated that the product is prepared by a high-purity synthetic process, with strict control of impurities and volatile components. It has achieved standardized batch supply and provides complete physical property test reports and Safety Data Sheets (SDS). The product complies with the technical specifications of domestic 275# diffusion pump oil and can also benchmark international high-end similar brands.
With the deepening dependence of China's cutting-edge fields such as advanced semiconductors, quantum technology and space simulation on ultra-high vacuum technology, domestic high-performance pump oils verified by long-term use such as IOTA705 are providing basic guarantee for the independent and controllable operation of key equipment.
Note: IOTA705 (275#) is a product that has been commercialized for many years, not a newly launched model. It is specially used for ultra-high vacuum diffusion pump systems and not suitable for ordinary mechanical lubrication or general industrial purposes.
