Basic Physical Properties of Ethyl Silicone Oil
Ethyl silicone oil is a pale yellow liquid with the following key physicochemical properties:
Operating Temperature Range: -60~150℃, suitable for wide temperature environments
Flash Point: 80°C (some high-viscosity products can reach 265°C)
Density: 0.96 g/cm³
Viscosity Characteristics: Viscosity changes little with temperature, low freezing point (<-40°C)
Chemical Stability: Low volatility, low surface tension, non-toxic, non-corrosive, and resistant to aging
Solubility: Soluble in organic solvents such as toluene and ether

General Requirements for Lubricating Oil in Hydraulic Systems
Hydraulic systems have the following core performance requirements for the working medium (hydraulic oil):
Viscosity-Temperature Performance: Minimal viscosity change within the operating temperature range
Lubrication Performance: Good lubricity and high oil film strength
Stability: Good stability against heat, oxidation, and hydrolysis, resulting in a long service life
Cleanliness: Minimal impurities in the oil, with no sedimentation allowed
Compatibility: Minimal impact on various materials used in the hydraulic system (metals, plastics, rubber, etc.)
Anti-wear Properties: Extends the service life of hydraulic pumps, motors, and other hydraulic components
Performance Comparison of Ethyl Silicone Oil and Traditional Hydraulic Oil

Performance Indicators: Ethyl Silicone Oil, Mineral Hydraulic Oil
Operating Temperature Range: -60~150℃ -20~80℃ (typical)
Viscosity Stability: Small variation with temperature; Large variation with temperature
Flash Point: 80-265°C; Approx. 200°C
Chemical Inertness: Excellent; Average
Dielectric Properties: Excellent; Average
Corrosivity to Metals: No corrosion; May cause corrosion
Service Life: Relatively long; Relatively short
Ethyl silicone oil exhibits significantly better stability than traditional mineral hydraulic oils in extreme temperature environments, and also possesses better dielectric properties and chemical inertness.

Practical Applications of Ethyl Silicone Oil in Hydraulic Systems
The main applications of ethyl silicone oil in hydraulic systems include:

Precision Instrument Lubrication: Utilizing its excellent lubrication performance and dielectric properties
Special Hydraulic Systems: Suitable for hydraulic systems in wide temperature environments or special operating conditions
Industrial Equipment Lubrication: Used as a mold release agent in the molding and processing of rubber and plastic products
Electrical Insulation Applications: Performs excellently in hydraulic systems requiring electrical insulation

Usage Compatibility and Precautions
Temperature Compatibility:
Optimal operating temperature range: -60~150℃
Short-term tolerance to higher temperatures (depending on specific product) (Specifications)
Pressure Limitation: Determined based on specific product specifications. Generally suitable for low to medium pressure hydraulic systems.
Sealing Material Compatibility: Compatibility with system sealing materials needs to be verified. May have minimal impact on some rubber materials.
Usage Recommendations: Suitable for hydraulic systems requiring a wide operating temperature range. Particularly suitable for precision instruments and special operating conditions. System compatibility testing should be performed before use.

Conclusion: Ethyl silicone oil, with its excellent temperature stability, chemical inertness, and dielectric properties, has unique advantages in hydraulic systems, especially suitable for wide temperature environments, precision instruments, and special operating conditions. However, its high cost and specific usage conditions also limit its widespread application in conventional hydraulic systems. When selecting its use, factors such as system requirements, cost-effectiveness, and compatibility should be comprehensively considered.