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In the world of high vacuum technology, the quality of diffusion pump oil directly determines the performance and reliability of the entire vacuum system. IOTA 705 is a colorless, transparent liquid specifically formulated for demanding vacuum applications. It corresponds to international grades such as CF-5 and 705, and the domestic designation 275. This product has earned a solid reputation across multiple industrial sectors, including metallurgy, electronics manufacturing, lighting, thin-film coating, particle accelerators, and electron microscopy.
| Parameter | Value |
|---|---|
| Appearance | Colorless transparent liquid |
| Kinematic Viscosity (25℃) | 170 – 175 mm²/s |
| Refractive Index (25℃) | 1.5765 – 1.5785 |
| Relative Density (25℃) | 1.090 – 1.10 |
| Flash Point (Open Cup) | ≥ 243℃ |
| Pour Point | ≤ -14 ~ -18℃ |
| Ultimate Vacuum (torr) | ＜ 1×10⁻⁹ ~ 10⁻¹⁰ |
| Saturated Vapor Pressure (torr) | ＜ 3×10⁻¹⁰ |
These specifications tell a clear story. The viscosity range of 170–175 mm²/s ensures smooth flow within the pump while maintaining a stable vapor jet. The flash point above 243℃ indicates strong thermal safety, meaning the oil can withstand prolonged high-temperature operation without ignition risk. The pour point below -14℃ ensures the oil remains fluid even in cold environments, preventing startup failures during winter months.
Most importantly, the saturated vapor pressure of less than 3×10⁻¹⁰ torr is a critical figure. In a diffusion pump, the oil is heated to create a high-speed vapor jet that carries gas molecules toward the exhaust. If the oil itself has a high vapor pressure, those oil molecules become a contamination source inside the vacuum chamber. IOTA 705's low vapor pressure means minimal backstreaming, allowing the system to achieve and maintain high vacuum levels consistently.
