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Phenylmethyl silicone fluid, also known as phenylmethyl silicone oil, is a phenyl-modified silicone fluid for industrial applications requiring heat resistance, low-temperature fluidity, electrical insulation, lubricity, or specified vacuum performance. Its siloxane structure contains phenyl and methyl groups, giving selected grades distinct viscosity, refractive-index, and thermal-performance profiles.
Depending on the selected model, it can be used in electrical-insulation systems, high-temperature lubricants and greases, damping applications, low-temperature systems, and UHV diffusion pumps. The series includes general industrial grades, high-phenyl and medium/low-phenyl grades, and UHV diffusion-pump fluids with different viscosity, freezing-point, flash-point, and vacuum-performance specifications.
Product Name | Model No. | Appearance | Viscosity (25℃, cs) | Relative Density (25℃) | Flash Point (℃) | Freezing Point (℃) | Refractive Index (25℃) | Product Features and Applications | |
Phenylmethyl Silicone Fluid | 9-250 | Colorless transparent liquid | 25-40 | 1.010-1.080 | ≥240 | ≤-45 | 1.47-1.48 | It exhibits the properties of low viscosity, low freezing point and excellent heat resistance. Used as: 4. Plasma bag isolation anti-stick agent. Equivalent to Dow DC-510 and Shin-Etsu KF-50 | |
9-255-75 | 50-100 | 1.020-1.080 | ≥280 | ≤-40 | 1.49-1.51 | It exhibits the properties of high flash point, antioxidant, radioresistance and hydrolysis resistance. Used as : 4. Plastic additive. Equivalent to Dow DC-550 and Wacker AP-100. | |||
9-255-150 | 100-200 | 1.020-1.080 | ≥300 | ≤-40 | 1.49-1.51 | ||||
9-255-300 | 200-400 | 1.020-1.080 | ≥300 | ≤-40 | 1.49-1.51 | ||||
9-255-500 | 400-600 | 1.020-1.080 | ≥300 | ≤-40 | 1.49-1.51 | ||||
9-255-1000 | 900-1100 | 1.020-1.080 | ≥300 | ≤-40 | 1.49-1.51 | ||||
9-255-2000 | 1500-2500 | 1.020-1.080 | ≥300 | ≤-40 | 1.49-1.51 | ||||
9-200 | 50-100000 | 1.000-1.020 | ≥280 | ≤-57 | 1.42-1.43 | It exhibits the properties of transparent, thermal stability and low-temperature fluidity. Used as: 4. Damping fluid for instruments and devices. | |||
9-201 | 500-20000 | 1.050-1.100 | ≥300 | ≤-40 | 1.53-1.54 | High-phenyl silicone oil, capable of withstanding working environment up to 350℃. | |||
9-202 | 100-20000 | 1.020-1.060 | ≥280 | ≤-40 | 1.46-1.48 | Medium/low-phenyl silicone oil, capable of withstanding working environment up to 350℃. | |||
9-274 (UHV diffusion pump fluids) | 36-40 | 1.020-1.080 | ≥210 | -14～-18 | 1.55-1.56 | Ultimate vacuum（Torr) ≤3.1×10ˉ⁷ | It exhibits the properties of very low saturated vapor pressure, excellent thermal stability, and oxidation resistance. | ||
9-275 (UHV diffusion pump fluids) | 165-185 | 1.090-1.100 | ≥245 | -14～-18 | 1.5765-1.5785 | Ultimate vacuum（Torr）≤3.1×10ˉ⁹ | |||
Selected phenylmethyl silicone fluid grades provide specified high flash points and low freezing points for applications involving elevated or low operating temperatures. Models 9-201 and 9-202 are described for working environments up to 350 °C, subject to validation under actual operating conditions.
Model 9-200 is designed for applications requiring thermal stability and low-temperature fluidity, while Model 9-250 provides a low-viscosity option with a freezing point of no more than −45 °C.
Selected grades can be used in compatible insulation, lubrication, damping, shock-absorption, and hydraulic-transmission systems. The 9-255 phenylmethyl silicone oil can also be considered as a base oil for high-temperature lubricating oils and greases.
Final performance depends on the selected viscosity, equipment design, operating temperature, load, and compatibility with the complete system.
Model 9-255-75 is described as providing a high flash point together with antioxidant, radiation-resistance, and hydrolysis-resistance properties. Other models in the 9-255 series provide different viscosity ranges for related high-temperature applications.
Models 9-274 and 9-275 are UHV diffusion pump fluids with specified ultimate vacuum levels of up to ≤3.1 × 10⁻⁷ Torr and ≤3.1 × 10⁻⁹ Torr, respectively. They are designed for compatible high-vacuum equipment requiring low saturated vapor pressure, thermal stability, and oxidation resistance.
Model 9-250 can be used as an insulating impregnating agent in compatible electrical-insulation systems. Selected 9-255 grades can also be considered for high-temperature thermal-carrier and insulation applications.
Evaluate dielectric performance, thermal stability, material compatibility, viscosity behavior, and equipment requirements before production-scale use.
The 9-255 series can be used as a base oil for compatible high-temperature lubricating oils and greases. Suitable grades can also be considered for lubrication of high-speed fan bearings, ball bearings, automotive engines, and other mechanical equipment.
Model 9-200 can be used in compatible low-temperature grease, plastic-bearing lubrication, hydraulic-transmission-fluid, and instrument-damping applications. Select the model according to operating temperature, viscosity, load, and required fluidity.
Models 9-201 and 9-202 can be considered for compatible systems requiring high-temperature performance. The appropriate grade should be selected according to the required phenyl type, viscosity range, refractive index, and operating environment.
Validate long-term thermal stability, compatibility with contacting materials, and finished-system performance under actual service conditions.
Models 9-274 and 9-275 can be used in compatible high-vacuum metallurgy, electron-tube manufacturing, high-vacuum coating, and electron-microscopy equipment.
Confirm vacuum-system compatibility, operating conditions, contamination-control requirements, and required ultimate vacuum level before use.
According to the current product information, Model 9-250 can be considered for compatible cosmetic-additive, surgical-oil, and plasma-bag isolation or anti-stick applications. Selected 9-255 grades can also be considered as plastic additives.
For cosmetic, medical, food-contact, or other regulated applications, the finished formulation, safety profile, and market-specific compliance requirements must be evaluated before commercialization.
Phenylmethyl Silicone Fluid is available in 25 kg plastic drums, 200 kg plastic drums, 200 kg plastic-coated iron drums, and 1,000 L IBC containers to meet different order-volume and production requirements.
Store the product in its original sealed packaging below 30 °C. Under the recommended storage conditions, the shelf life is 24 months from the production date.
According to the current product information, Phenylmethyl Silicone Fluid is described as a non-dangerous product and can generally be transported through ordinary cargo logistics channels. For handling guidance, final transport classification, and destination-specific shipping requirements, confirm the latest SDS before shipment.
The current product range includes 12 listed models, covering low-viscosity, multi-viscosity, high-phenyl, medium/low-phenyl, and UHV diffusion-pump-fluid options.
Select the grade according to the required viscosity, operating temperature, flash point, freezing point, refractive index, intended application, and required vacuum level where applicable. Final suitability should be confirmed through application testing.
Models 9-274 and 9-275 are UHV diffusion pump fluids. Their specified ultimate vacuum levels are ≤3.1 × 10⁻⁷ Torr and ≤3.1 × 10⁻⁹ Torr, respectively.
Model 9-201 is a high-phenyl silicone oil with a viscosity range of 500–20,000 cSt at 25 °C. Model 9-202 is a medium/low-phenyl silicone oil with a viscosity range of 100–20,000 cSt at 25 °C.
The named Dow, Shin-Etsu, and Wacker products are application-comparison references only. They do not indicate an unconditional equivalent or replacement. Confirm compatibility and final performance through side-by-side testing in the intended application.
The current product information lists Model 9-250 for compatible cosmetic-additive and surgical-oil applications. The finished formulation, safety requirements, and applicable market compliance must be evaluated before use.
Store the product in its original sealed packaging below 30 °C. Under the recommended storage conditions, the shelf life is 24 months from the production date.
