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IOTA 704, as a high vacuum diffusion pump oil, is a colorless or transparent liquid, making it easy to assess purity—cloudiness or color changes may indicate contamination or degradation. Its basic parameters include a viscosity of 38±3 cst at 25℃, optimized for flow efficiency in diffusion pumps while preventing sealing issues from low viscosity; a refractive index of 1.5500~1.5600 at 25℃, serving as a purity reference—deviations may suggest foreign substances; and a relative density of 1.06~1.07 at 25℃, balanced to avoid excessive pump load from high density or rapid evaporation from low density.
Among all parameters, vacuum level and saturated vapor pressure are IOTA 704's core strengths. A vacuum level of ＜10-7~10-8 Pa meets most high vacuum needs, such as the ＜10-5 Pa required for electron microscopes, which IOTA 704 can easily achieve and maintain. A saturated vapor pressure of ＜2x10-8 Pa means less evaporation at high temperatures, reducing oil vapor contamination of the vacuum system and extending oil life. The combination of a flash point ≥210℃ and freezing point -35℃ gives it a wide operating temperature range (-35℃ to over 210℃), making it adaptable to various environments.
In the electron tube industry, IOTA 704's low vapor pressure prevents oil vapor from entering tubes, avoiding cathode poisoning and improving tube performance. In high vacuum coating, such as optical or semiconductor films, a high vacuum (usually ＜10-6 Pa) is needed for uniform film deposition, which IOTA 704's vacuum performance supports. In atomic accelerators, it maintains the vacuum inside, reducing particle-gas collisions and improving acceleration efficiency. For display production, like LCD manufacturing, it ensures smooth liquid crystal filling under high vacuum.
IOTA 704's thermal stability and oxidation resistance ensure long-term use. At high temperatures (over 100℃ during pump operation), it resists decomposition, preventing carbon deposits from clogging the pump. Oxidation resistance slows aging by reducing reactions with oxygen. Usage tips include controlling oil levels within pump marks to avoid dry running or vapor entry, and degassing new oil to remove dissolved gases for better initial vacuum.
