Fluorosilicone oil, with its extremely low volatility, wide temperature range stability, and excellent chemical inertness, provides a long-lasting and reliable lubrication solution for precision instruments, especially suitable for lubricating precision components in high vacuum, high temperature, and corrosive environments.
I. Core Advantages of Fluorosilicone Oil in Precision Instruments
1. Ultra-Low Volatility
Fluorosilicone oil has a volatility rate of only 0.05% at 200℃, far lower than ordinary silicone oil, ensuring that lubrication failure due to evaporation does not occur during the long-term operation of precision instruments.
The fluorine atoms in its molecular structure form an "electron shielding effect," effectively resisting erosion from solvents and chemical media, preventing the formation of residues on the surface of precision components.
It performs particularly well in high vacuum environments (below 10⁻⁸ Pa), with extremely low evaporation loss, making it an ideal choice for precision instruments such as semiconductor wafer manufacturing and aerospace equipment.

2. Wide Temperature Range Stability
Fluorosilicone oil has a working temperature range of -60℃ to 250℃ (some high-end products can reach 300℃). It remains soft and does not harden at low temperatures, and does not easily volatilize or coke at high temperatures.
Compared with ordinary silicone grease (-50℃ to 200℃), fluorosilicone oil has a smaller viscosity-temperature coefficient and more stable viscosity changes at extreme temperatures, ensuring smooth operation of precision instruments under various working conditions.
Within the temperature range of -40℃ to 240℃, fluorosilicone oil can maintain stable lubrication performance, making it particularly suitable for temperature-sensitive applications such as precision bearings in watches and micro-mechanical systems.

3. Excellent Chemical Stability
Fluorosilicone oil is resistant to strong acids, strong bases, and various organic solvents, performing excellently in precision instruments that come into contact with corrosive media.
Its surface tension is as low as 20-24 mN/m, allowing it to form a uniform and durable isolation film on metal surfaces, effectively blocking the adhesion between materials and molds, making it particularly suitable for precision optical instruments and semiconductor equipment.
It has good compatibility with oil-resistant rubbers and plastics such as EPDM and NBR, and will not cause material expansion or embrittlement, making it an ideal choice for precision seals (O-rings, sealing rings). II. Typical Application Scenarios in Precision Instruments
1. Semiconductor and Cleanroom Equipment
Fluorosilicone grease is used as a lubricant and sealant for bearings, pumps, valves, and seals in semiconductor cleanroom equipment. Its low volatility ensures that it does not contaminate the high-purity production environment.
In semiconductor manufacturing processes such as plasma etching, chemical vapor deposition, and ion implantation, fluorosilicone oil is used to lubricate mechanical vacuum pumps, ensuring stable operation of the equipment in high vacuum environments.
Perfluoropolyether grease is particularly suitable for precision equipment such as bearings in film stretching and tentering machines and heat setting machine conveyor belt bearings, ensuring the continuity of the production process and product quality.

2. Precision Machinery and Optical Instruments
As a long-lasting lubricant for high-precision bearing components in the watchmaking industry, fluorosilicone oil can significantly improve steel-on-steel boundary lubrication, reducing the friction coefficient by more than 30%.
In precision equipment such as laser printers and CD-ROM drives, fluorosilicone oil is used as a lubricant, withstanding temperatures above 121°C and rotational speeds of 1.4 million revolutions per minute.
In micro-mechanical systems, fluorosilicone oil is used as a lubricant for micro-mechanical bearings, significantly improving the boundary lubrication performance of steel-on-steel contact surfaces.

3. High Vacuum and Aerospace Equipment
In high vacuum environments below 10⁻⁸ Pa, fluorosilicone grease exhibits extremely low volatile loss, ensuring long-term system stability, making it an ideal lubricating material for aerospace equipment.
As a vacuum pump lubricant, it is suitable for handling reactive gas media, and is particularly suitable for precision vacuum systems requiring long-term stable operation.
The low surface tension and chemical stability of fluorosilicone oil make it an ideal lubricating material for seals and valves in high vacuum systems, preventing leakage under extreme conditions. III. Comparative Advantages of Fluorosilicone Oil vs. Ordinary Silicone Grease

Table
Characteristic | Fluorosilicone Oil | Ordinary Silicone Grease
Temperature Range | -60℃～250℃ (some up to 300℃) | -50℃～200℃
Volatility | Only 0.05% at 200℃ | Higher volatility at high temperatures
Chemical Stability | Resistant to strong acids, strong bases, and organic solvents | Good water resistance, but easily swells in polar solvents
Surface Tension | 20-24 mN/m | Relatively high
Applicable Environment | High vacuum, corrosive environments | Conventional environments
Price | 1000-5000 RMB/kg | 150-200 RMB/kg
Data Source: Compiled from multiple industry sources

IV. Application Recommendations
Selection Criteria: Choose the appropriate fluorosilicone oil product based on the operating temperature range, contact medium type, and vacuum requirements of the precision instrument. Perfluoropolyether-based fluorosilicone oil is preferred in high-vacuum environments.
Usage Method: Apply a small, precise amount to precision instruments to avoid excessive use and contamination; for bearings and other components, use a dedicated grease gun to ensure a clean lubrication process.
Maintenance Cycle: Fluorosilicone oil has a long lubrication life and generally does not require frequent replacement, but under high load and high speed conditions, regular inspection of the lubrication status is recommended.
Precautions: Avoid prolonged contact with lead-containing and sulfur-containing compounds to prevent possible chemical reactions; confirm the safety of the formula before use in a pure oxygen environment.
Fluorosilicone oil, with its unique molecular structure and excellent performance, has become the preferred material in the field of precision instrument lubrication, especially demonstrating irreplaceable advantages in semiconductor, optical instruments, and high-vacuum equipment. Proper selection and use of fluorosilicone oil can significantly extend the service life of precision instruments and improve operational stability and reliability.