Which has better temperature resistance, silicone rubber or fluorine rubber?

The overall temperature resistance performance of fluorine rubber is superior to that of silicone rubber. Its temperature resistance range is wider and its high-temperature stability is stronger, while silicone rubber performs better in terms of low-temperature elasticity. The following is a detailed analysis:

1. Temperature Resistance Range Comparison

Fluorine Rubber

Long-term working temperature: -20℃ to 250℃ (some special formulations can reach 300℃).

Low-temperature performance: Ordinary fluorine rubber can still maintain elasticity at -20℃, while improved types (such as low-temperature fluorine rubber) can withstand -50℃.

High-temperature performance: The C-F bonds in the molecular chain have extremely high strength, and they are not prone to breaking at high temperatures. It can withstand temperatures above 300℃ for a short period. Silicone rubber

Long-term working temperature: -60℃ to 200℃ (some formulations can reach 250℃).

Low-temperature performance: Conventional silicone rubber can still function at -55℃, and with the introduction of phenyl groups, it can reach -73℃.

High-temperature performance: Can be used for a long time at 180℃, and can withstand for several weeks or longer at slightly above 200℃, and can withstand temperatures above 300℃ for a short period.

II. Comparison of High-Temperature Stability

Fluorine rubber

Long-term high-temperature adaptability: Can be used for a long time at 200℃ or higher temperatures, suitable for extreme high-temperature environments such as aerospace and automotive engines.

High-temperature chemical stability: Resistant to oil, solvents, acids, and alkalis, with stable chemical properties at high temperatures, and不易decompose or swell. Silicone rubber

Short-term high-temperature tolerance: The instantaneous temperature resistance is outstanding (above 300℃), but it is prone to physical performance degradation under long-term high temperatures (such as increased hardness and decreased elasticity).

High-temperature chemical sensitivity: It is sensitive to some chemical substances (such as hydrocarbon solvents), and may swell or corrode at high temperatures.

III. Comparison of Low-Temperature Elasticity

Fluorine rubber

The elasticity decreases rapidly at low temperatures. Ordinary fluorine rubber may harden below -20℃, while the improved type can withstand -50℃, but its elasticity is still inferior to that of silicone rubber. Silicone rubber

Excellent low-temperature elasticity. Regular silicone rubber can still maintain flexibility at -55℃, and with the introduction of phenyl groups, it can reach -73℃, suitable for extremely cold environments (such as aerospace equipment, low-temperature sealing).

IV. Summary of Application Scenarios

Fluorine rubber

High-temperature and high-pressure environment: aerospace engine sealing rings, automotive fuel systems, industrial high-temperature pipelines.

Chemical corrosion environment: chemical equipment, oil extraction, pharmaceutical industry (resistant to acids and alkalis, resistant to solvents). Silicone rubber

Low-temperature elasticity requirements: Polar scientific research equipment, low-temperature seals, spacecraft low-temperature components.

Biological compatibility requirements: Medical catheters, breathing masks, food contact materials.

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