Fluorosilicone oil exhibits excellent oil and medium resistance performance in oil and gas extraction equipment.  Its core advantage stems from the introduction of trifluoropropyl groups into its molecular structure, giving the siloxane main chain both the wide temperature range stability of organosilicon and the chemical inertness of fluorocarbon compounds.

Medium Resistance Performance
Resistance to Crude Oil and Hydrocarbon Media: In mineral oil, diesel fuel, lubricating oil, and methanol-containing gasoline (85% gasoline/15% methanol) environments, fluorosilicone oil shows minimal volume change after 500 hours of immersion, with tensile strength and hardness retention rates above 90%, and no swelling, softening, or cracking.
Resistance to Drilling Fluids and Sulfur-Containing Environments: It has excellent chemical stability against water-based and oil-based drilling fluids, and can withstand environments containing H₂S (partial pressure ≤ 70 kPa) and CO₂. The corrosion rate is significantly lower than that of carbon steel and ordinary silicone rubber, and it maintains structural integrity even when the H₂S/CO₂ partial pressure ratio is ≥ 0.005.
Resistance to Solvents and Chemical Reagents: It exhibits zero corrosion to non-polar media such as aromatic hydrocarbons, chlorinated hydrocarbons, ester hydraulic oils, and silicate synthetic oils, and is non-reactive to fluorinated coolants (such as HEXAFLUOR Boreaf™).
Temperature Adaptability and Long-Term Service Capability
Performance Indicator | Fluorosilicone Oil Performance | Comparative Material (Fluororubber FKM)
Operating Temperature Range | -60℃ ~ 250℃ (short-term) | -20℃ ~ 260℃
Brittle Temperature | ≤ -89℃ | ≈ -30℃
High-Temperature Aging (200℃ × 4000h) | Stable physical properties, no significant degradation | Significant oxidative aging, requires the addition of heat stabilizers
Compression Set (150℃ × 24h) | <15% | 15%~25%
Fluorosilicone oil can continuously operate for over 2000 hours in a 150℃ downhole tool sealing environment, with low compression set and high elastic recovery rate, making it suitable for long-term high-pressure, high-temperature, and high-humidity working conditions. Applications and Typical Scenarios
Sealing Components: Used as O-rings, sealing rings, and gasket materials in downhole packers, pumps, valves, and sensor interfaces, withstanding active expansion in hydrocarbon fluid environments.
Lubrication and Coatings: Used as a base oil for lubricants, improving boundary lubrication of steel-on-steel contact surfaces, suitable for high-temperature bearings and precision machinery; impregnated into glass wool for demisters in the chlor-alkali industry, providing chlorine resistance for over 5 years.
Composite Materials: Used as a structural control agent for fluorosilicone rubber, enhancing the oil resistance and low-temperature flexibility of elastomers, widely used in blowout preventer sealing systems for oil and gas wells.
Performance Testing Basis
The media resistance performance evaluation of fluorosilicone oil follows internationally accepted standards:

Volume change rate, hardness change, tensile strength retention rate, and compression set are key indicators, performed according to ASTM D471 and GB/T 1690 standards.
Test media include IRM902 oil (simulating mineral oil), IRM903 oil (simulating synthetic oil), and actual downhole fluids, with immersion times covering multiple cycles of 24h, 168h, and 500h.
Advantages Compared to Fluororubber (FKM)
Low-Temperature Performance: Fluorosilicone oil has a brittle temperature as low as -89℃, far superior to fluororubber (-30℃), making it suitable for oil and gas field operations in extremely cold regions.
Methanol Gasoline Resistance:  Physical properties remain almost unchanged in gasoline/methanol mixed systems, while fluororubber is prone to swelling and hardening.
Comprehensive Durability: In the wide temperature range of -68℃ to 232℃, fluorosilicone oil is the only elastomer material that can stably withstand non-polar media.