The chemical corrosion resistance of fluorosilicone oil mainly comes from the trifluoropropyl group introduced in its molecular structure. This property makes it perform well in extreme chemical environments. It can be divided into the following aspects:

1. Corrosion resistance mechanism and characteristics
‌Molecular structure advantage‌

Fluorosilicone oil replaces the methyl group in the siloxane chain with trifluoropropyl to form a strong carbon-fluorine bond (bond energy up to 485 kJ/mol), giving it extremely high chemical inertness.

It has low surface energy and is hydrophobic and oleophobic. It can form a directional molecular film with an outer layer of -CF₃ on the surface of the substrate, effectively isolating the corrosive medium.
‌Tolerance range‌

‌Strong acid/strong alkali‌: Tolerant to concentrated sulfuric acid (98%), hydrofluoric acid (40%), sodium hydroxide, etc., and no obvious corrosion after long-term contact.
‌Organic solvents‌: The stability to solvents such as acetone, benzene, and alcohols is significantly better than that of ordinary silicone oil.
‌Oxidative environment‌: Resistant to corrosion by strong oxidants, suitable for electroplating, chemical reactions and other scenarios.

2. Performance comparison and verification
Corrosive media ‌Performance of fluorosilicone oil ‌Performance of ordinary silicone oil ‌Concentrated sulfuric acid (98%) Long-term stable use Prone to degradation
Hydrofluoric acid (40%) Lifespan is more than 10 times that of stainless steel pipe Severe corrosion
Organic solvents (such as acetone) No swelling or dissolution Partial dissolution or performance degradation

3. Practical application scenarios
High temperature and high pressure equipment
Used for sealing and lubrication of chemical reactors (-60~250℃), resistant to corrosion by acidic byproducts.
Semiconductor manufacturing
Transporting hydrofluoric acid etching solution, high purity characteristics to avoid wafer contamination.
Harsh environment sealing
Fluorosilicone grease (FG203 type) is resistant to acid mist and chloride corrosion in high temperature valves, and is suitable for temperatures of -30~280℃.

4. Limitations
Taboo for silicon-containing materials: In a fluosilicic acid environment, avoid contact with silicon-containing film-forming materials, otherwise decomposition to produce silicon tetrafluoride will cause failure.
‌Cost factor‌: The price is higher than that of ordinary silicone oil, and the corrosion risk and economy need to be weighed.

In summary, the chemical corrosion resistance of fluorosilicone oil is fundamentally determined by its molecular structure. It is irreplaceable in strong acid, strong alkali, solvent and high temperature and high pressure environments, but it is sensitive to silicon-containing media and needs to be used with caution.