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Product Brand: IOTA Silicone Oil
IOTA-704 is a silicone-based diffusion pump oil designed for use in compatible high-vacuum systems. Its key characteristics include low saturated vapor pressure, good thermal stability, and excellent oxidation resistance. It is intended for industrial applications that require reliable vacuum conditions, stable oil performance, and compatibility with specific equipment operating requirements.
IOTA-704 is a colorless, transparent oily liquid. According to the supplied product documentation, its CAS number is 3982-82-9. The English product name is Silicone Diffusion Pump Oil, and its stated chemical name is 1,1,5,5-tetraphenyltetramethyltrisiloxane.
For vacuum equipment manufacturers, vacuum coating companies, and industrial procurement professionals, selecting diffusion pump oil involves more than checking viscosity. Saturated vapor pressure, ultimate vacuum performance, thermal stability, and actual operating conditions should all be considered.
The main technical specifications of IOTA-704 are listed below.
| Technical Parameter | Specification |
|---|---|
| Product Name | IOTA-704 Silicone Diffusion Pump Oil |
| CAS Number | 3982-82-9 |
| Appearance | Colorless, transparent liquid |
| Kinematic Viscosity at 25°C | 38 ± 3 cSt |
| Refractive Index at 25°C | 1.5500–1.5600 |
| Relative Density at 25°C | 1.06–1.07 |
| Flash Point, Open Cup | ≥210°C |
| Pour/Freezing Point | -35°C |
| Ultimate Vacuum | <3.99 × 10⁻⁵ Pa |
| Saturated Vapor Pressure | <6.65 × 10⁻⁶ Pa |
Note: The specifications above are based on the supplied product information. Please refer to the latest Technical Data Sheet (TDS), batch-specific Certificate of Analysis (COA), and applicable test conditions for confirmation.
Saturated vapor pressure is an important parameter for evaluating the tendency of a vacuum pump oil to vaporize at a given temperature.
In high-vacuum systems, the vapor behavior of the working fluid can affect the vapor load within the system and the potential risk of contamination. Selecting a diffusion pump oil with low saturated vapor pressure can therefore help meet the vapor-related requirements of high-vacuum applications.
According to the supplied product specifications, IOTA-704 has a saturated vapor pressure below 6.65 × 10⁻⁶ Pa. This value can serve as an important reference during preliminary product evaluation and selection.
However, the actual vacuum level achieved by a complete system depends on more than the vapor pressure of the pump oil. Factors such as diffusion pump design, heating temperature, cooling conditions, system sealing, gas load, and backing pump performance also play important roles.
Therefore, the ultimate vacuum performance of an entire vacuum system cannot be determined solely from the saturated vapor pressure of the oil.
Diffusion pump oil must withstand continuous heating during operation. Thermal stability can influence long-term operating performance, while oxidation resistance helps reduce the risk of performance changes associated with oxidation.
IOTA-704 offers good thermal stability and excellent oxidation resistance, making it a candidate for evaluation in high-vacuum systems operating within the equipment manufacturer's specified conditions.
For industrial equipment requiring continuous operation or carefully managed maintenance intervals, users should also evaluate the actual operating temperature, changes in oil condition, equipment maintenance records, and the replacement intervals recommended by the equipment manufacturer.
Some high-vacuum metallurgy and materials-processing systems use diffusion pumps to establish the required vacuum environment. Vapor pressure, thermal stability, and compatibility with the equipment are important factors when selecting the working fluid.
IOTA-704 may be evaluated for suitable diffusion pump systems used in these applications, subject to equipment and process requirements.
Vacuum coating processes often require controlled vacuum conditions and effective contamination management.
IOTA-704 may be considered for compatible high-vacuum diffusion pump systems used in vacuum coating. Its suitability should be confirmed based on the coating process, equipment design, and contamination-control requirements.
Electron tube manufacturing and other electronic industrial processes may use diffusion pumps to establish the vacuum conditions required for specific manufacturing steps.
The selection of diffusion pump oil should be consistent with the equipment design, operating conditions, and process requirements.
Some scientific and analytical instruments incorporate high-vacuum systems. For these applications, users should pay particular attention to oil vapor backstreaming, system cleanliness, and the oil specifications required by the equipment manufacturer.
Product suitability should not be determined solely by a single technical parameter.
Before purchasing diffusion pump oil, it is advisable to review the following factors:
Equipment type: Confirm the brand, model, and design of the diffusion pump.
Target vacuum conditions: Identify the required operating pressure and the equipment's specified ultimate vacuum performance.
Operating temperature: Check the pump heating and cooling conditions.
Cleanliness requirements: Determine whether the process has specific limits for oil vapor backstreaming, film contamination, or residues.
Oil specifications: Compare viscosity, saturated vapor pressure, flash point, and other relevant technical parameters.
Compatibility requirements: Confirm whether the equipment manufacturer specifies a particular type of working fluid.
If the equipment has strict vacuum cleanliness requirements or specialized process compatibility needs, technical confirmation and appropriate validation testing should be completed before changing the pump oil.
Q1: What is IOTA-704?
IOTA-704 is a high-vacuum silicone diffusion pump oil intended for applications requiring low saturated vapor pressure, good thermal stability, and oxidation resistance, according to the supplied product documentation.
Q2: What is the CAS number of IOTA-704?
The supplied product documentation lists CAS No. 3982-82-9.
Q3: What is the viscosity of IOTA-704?
The specified kinematic viscosity is 38 ± 3 cSt at 25°C.
Q4: What is the ultimate vacuum specification of IOTA-704?
The supplied product information specifies an ultimate vacuum value below 3.99 × 10⁻⁵ Pa. The test method, test conditions, and applicability of this value to a particular system should be confirmed with the supplier.
Q5: Can IOTA-704 be used in vacuum coating equipment?
IOTA-704 may be evaluated for compatible diffusion pump systems used in vacuum coating. Its suitability depends on the coating process, equipment manufacturer's specifications, and contamination-control requirements.
If you are looking for Silicone Diffusion Pump Oil for a high-vacuum system, IOTA-704 can be considered as a candidate for technical evaluation and product selection.
Contact IOTA Silicone Oil to request the latest technical data sheet, batch quality documentation, and product suitability recommendations.
For a more accurate quotation and technical evaluation, please provide the following information:
Diffusion pump brand and model
Target vacuum level
Operating temperature
Required purchase quantity
Destination country or delivery location
This information will help us provide more relevant technical guidance and commercial support for your application.
