Vacuum Lifeline, New Vacuum — IOTA 702 Vacuum Diffusion Pump Oil Sets a New Vacuum for High-Vacuum Industry with Ultra-Low Saturated Vapor Pressure and Thermo-Oxidative Stability
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In high-end manufacturing and precision scientific research fields such as high-vacuum smelting, electron tube manufacturing, light bulb production, vacuum coating (film), atomic energy accelerators, electron microscopes, and displays, the four major indicators of "ultimate vacuum degree — saturated vapor pressure — thermal stability — antioxidant service life" directly determine the performance ceiling and operating cost of high-vacuum systems. Traditional mineral-based diffusion pump oils tend to crack, coke, and backstream under working temperatures, contaminating the vacuum chamber and forcing enterprises into frequent shutdowns for cleaning and oil changes, putting dual pressure on production line yield and equipment uptime. Although synthetic hydrocarbon pump oils provide some improvement, they still struggle to balance low volatility with anti-aging during long-term continuous operation above 200°C. With the continuous upgrading of demands for "ultra-clean high-vacuum environment + long-cycle stable operation" in vacuum coating, semiconductor packaging, and precision scientific instruments, sourcing a diffusion pump working fluid with "ultra-low saturated vapor pressure, excellent thermo-oxidative stability, wide applicability, and low comprehensive cost" has become the core proposition for the autonomy of the high-vacuum industry chain.
Addressing this, Anhui IOTA Silicone Oil Co., Ltd. officially launches IOTA 702 Vacuum Diffusion Pump Oil. Characterized by "appearance: colorless transparent liquid; kinematic viscosity at 25°C: 45±3 cst; refractive index at 25°C: 1.5100-1.5300; relative density at 25°C: 1.08; open-cup flash point: 195°C; freezing point: -40°C; ultimate vacuum: <1.333×10⁻⁴ Pa; saturated vapor pressure: <1.333×10⁻⁴ Pa; packaging: 1kg plastic bottle / 5kg, 25kg, 50kg plastic drum / 200kg iron drum; transported and stored as non-dangerous goods; shelf life: 2 years", backed by "ultra-low saturated vapor pressure suppressing backstreaming + excellent thermal stability ensuring longevity + strong antioxidant capacity extending oil change cycles", it serves as the "blood of choice" for high-vacuum diffusion pumps, achieving the leap from "mineral oil prone to cracking and backstreaming contamination" to "silicone-based long-life clean high vacuum". As a product comparable to Dow Corning DC702 and Shin-Etsu HIVAC F-2, IOTA 702 fills the key link in the domestic high-vacuum industrial silicone oil supply chain with the stance of domestic substitution.
System Positioning: Silicone-Based Diffusion Pump Oil vs. Mineral-Based / Synthetic Hydrocarbon Pump Oil
IOTA 702 belongs to the silicone-based high-vacuum diffusion pump oil system, distinct from traditional mineral-based diffusion pump oils and synthetic hydrocarbon pump oils. Mineral-based oils tend to crack, coke, and cause severe backstreaming contamination under working temperatures, requiring frequent oil changes. Although synthetic hydrocarbon oils provide some improvement, they still struggle to balance low volatility with anti-aging during long-term high-temperature continuous operation. Silicone-based diffusion pump oils, leveraging the inherent thermal stability of the Si-O-Si backbone and ultra-low saturated vapor pressure, exhibit minimal volatilization, no cracking, and no coking at high temperatures, thoroughly avoiding the backstreaming contamination and short service life shortcomings of traditional oils, making them the ideal working fluid for achieving 10⁻⁴ Pa-level high vacuum.
Molecular Architecture: Si-O Backbone Thermal Stability + Viscosity Grade Precision Matching + Wide-Temperature Fluid Balance
The core competitiveness of IOTA 702 stems from the precision matching of silicone oil molecular architecture and viscosity grade:
Si-O Backbone Thermal Stability: The polysiloxane backbone provides excellent thermal stability and antioxidant properties. It does not crack, coke, or deteriorate during long-term continuous operation above 200°C, guaranteeing the ultra-long service life of the pump oil at the molecular level.
Viscosity Grade Precision Matching: The kinematic viscosity at 25°C is controlled at 45±3 cst. This viscosity window ensures the formation of a stable supersonic vapor jet inside the diffusion pump while enabling rapid condensation and reflux on cold walls, balancing pumping speed with low backstreaming rate.
Wide-Temperature Fluid Balance: The open-cup flash point reaches 195°C, ensuring safe operation under continuous equipment heating; the freezing point is as low as -40°C, making it less likely to solidify in low-temperature environments or after equipment shutdown, adapting to workshop conditions with large temperature fluctuations.
Performance Leap: From "Prone to Cracking and Backstreaming" to "Long-Life Clean High Vacuum"
Introducing IOTA 702 brings a qualitative leap to high-vacuum systems:
Ultra-Low Saturated Vapor Pressure: A saturated vapor pressure of <1.333×10⁻⁴ Pa effectively suppresses medium backstreaming, reduces vacuum chamber contamination, ensures vacuum environment cleanliness, and significantly reduces chamber cleaning frequency and maintenance downtime.
Stable Achievement of Ultimate Vacuum: An ultimate vacuum of <1.333×10⁻⁴ Pa meets the demands of mainstream high-vacuum industrial scenarios such as high-vacuum smelting, electron tubes, and vacuum coating.
Dual Excellence in Thermal Stability and Antioxidant Properties: Excellent thermal stability and antioxidant capacity ensure no cracking, oxidation, or deterioration under long-term high-temperature operation, slowing oil aging, extending oil change cycles, and helping enterprises reduce consumable costs and equipment operation workload.
Safety and Adaptability Combined: The open-cup flash point of 195°C ensures heating safety; refractive index 1.5100-1.5300 and relative density 1.08 facilitate process monitoring and quality identification; the -40°C low freezing point adapts to wide-temperature working conditions.
Non-Dangerous Goods Cost Reduction: Transported and stored as non-dangerous goods, reducing enterprise warehousing logistics thresholds and compliance costs.
Application Penetration: From High-Vacuum Smelting to Precision Scientific Instruments
The application boundary of IOTA 702 covers all industrial and scientific scenarios requiring "10⁻⁴ Pa-level high vacuum + long-cycle clean operation":
High-Vacuum Smelting Industry: Stable vacuum conditions ensure metal smelting and purification processes are not disturbed by impurity gases, improving material purity.
Electron Tube and Light Bulb Manufacturing: High-vacuum environment completes chamber degassing, improving the service life of electron tube and bulb components.
Vacuum Coating (Film): Whether for optical coating, decorative coating, or functional coating, a clean and stable high-vacuum environment is the basis for coating uniformity and adhesion. IOTA 702 can strongly support the stable operation of continuous coating production lines.
Atomic Energy Accelerators and Electron Microscopes: Meets the high-precision vacuum experimental needs of high-end scientific research and precision electronic instruments.
Display Manufacturing: Provides a reliable high-vacuum working fluid for display manufacturing processes.
IOTA Technical Guide: Moisture-Proof and Light-Avoiding, Non-Dangerous Storage and Transport
Application: Used as a working fluid for oil diffusion pumps. Before adding new oil, ensure the diffusion pump system is clean and dry; the boiler heating voltage can be matched according to the fore-vacuum pump configuration and target vacuum requirements.
⚠️ Taboo: Strictly prohibit mixing with other oils, water, and impurities; when changing oil, first clean the diffusion pump chamber with No. 120 solvent gasoline, dry it, and then add the specified amount of oil; avoid direct sunlight.
Storage: Packaged in 1kg plastic bottles, 5kg/25kg/50kg plastic drums, or 200kg iron drums; stored and transported in moisture-proof, damp-proof warehouses avoiding direct sunlight, with indoor temperature allowed from -40 to 50°C; transported and stored as non-dangerous goods; shelf life: 2 years.
Handling: The colorless transparent liquid facilitates liquid level observation; the open-cup flash point of 195°C requires attention to temperature control of the heating system during operation; the low freezing point characteristic makes restart after shutdown more convenient.
Industry Insight: In the high-vacuum industry chain, the molecular design of diffusion pump oil — "ultra-low saturated vapor pressure + excellent thermo-oxidative stability + wide-temperature fluid balance" — is the key path to achieving the trinity of "high vacuum degree + low backstreaming contamination + long oil change cycle" — the introduction of the silicone-based structure solves the industry pain point of mineral oils: "prone to cracking and backstreaming contamination", while the precise matching of the 45±3 cst viscosity grade ends the application shortcoming of "pumping speed and backstreaming being incompatible". IOTA 702, with "saturated vapor pressure <1.333×10⁻⁴ Pa + open-cup flash point 195°C + freezing point -40°C + non-dangerous goods + comparable to DC702/HIVAC F-2" hard metrics, fills the key supply chain link for domestic high-vacuum diffusion pump silicone oil in smelting, electron tubes, vacuum coating, accelerators, electron microscopes, and other fields, providing a mass-producible high-cost-performance working fluid for downstream high-vacuum industrial enterprises. This confirms that domestic vacuum silicone oil is leaping toward "mineral oil → synthetic hydrocarbon → silicone-based long-life clean" in terms of dual improvements in thermal stability and vacuum performance, with growing technical say in the high-vacuum industrial field.
