Which has better anti-aging performance, perfluoro rubber or fluorine rubber?

The anti-aging performance of perfluoro rubber is generally superior to that of fluorine rubber, especially in terms of long-term stability under extreme conditions. The following provides a comparative analysis from four aspects: weather resistance, chemical corrosion resistance, high-temperature resistance, and actual cases.

1. Weather resistance and ozone resistance

Perfluoro rubber: It has outstanding weather aging resistance and can maintain physical properties and appearance stability in environments such as ultraviolet rays, ozone, and oxygen. For example, after being exposed to an ozone concentration of 0.01% for 45 days, it shows no obvious cracking, and its performance remains satisfactory after being stored naturally for ten years.

Fluor rubber: Although it also has excellent ozone and weather aging resistance, its performance degradation rate is slightly faster than that of perfluoro rubber during long-term exposure tests. For instance, the VitonA fluor rubber developed by DuPont still has acceptable performance after being stored naturally for ten years, but the stability of perfluoro rubber is more enduring.

2. Chemical corrosion resistance

Perfluoro rubber: It has significantly stronger resistance to strong corrosive media (such as concentrated sulfuric acid, fuming nitric acid, strong oxidants, etc.) than fluor rubber. For example, 23-type perfluoro rubber immersed in 98% concentrated nitric acid at room temperature for 27 days, its volume expansion is only 13% to 15%, while the expansion rate of fluor rubber under similar conditions is higher.

Fluor rubber: Although it can resist most organic liquids and acids and bases, its stability in strong oxidizing inorganic acids or extreme chemical environments is slightly inferior to perfluoro rubber.

3. High-temperature resistance

Perfluoro rubber: It has better high-temperature performance. 246-type perfluoro rubber maintains good elasticity after 16 hours of heat air aging at 350°C, and the performance decline after short-term use at 400°C is relatively small.

Fluor rubber: 26-41-type fluor rubber can be used for a long time at 250°C and short-term use at 300°C, but its elasticity retention ability at high temperatures is slightly weaker than perfluoro rubber.

4. Practical application cases

Perfluoro rubber: Widely used in extreme environments such as aviation, aerospace, and petrochemicals, for example, manufacturing corrosion-resistant pumps, seals, and valves to ensure reliability in high-temperature, high-pressure, and highly corrosive media.

Fluor rubber: Often used in automotive and mechanical fields, such as engine seals and fuel system components. Its performance meets general industrial requirements, but the lifespan in extreme environments is shorter.

Perfluoro rubber has a higher content of fluorine atoms in its molecular structure, forming more stable carbon-fluorine bonds, thus performing better in anti-aging performance. If the application scenarios involve extreme environments (such as strong corrosion, high temperature, and long-term outdoor exposure), perfluoro rubber is a better choice; if the requirements are mainly for general industrial environments, fluor rubber can provide a more cost-effective solution.

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