Why use silicone rubber in aerospace applications?

"silicone rubber in aerospace applications"

In the aerospace industry, materials need to withstand extreme conditions. Silicone rubber has proven to be an excellent choice due to its unique properties. But why exactly is it so well-suited for this demanding field?

Silicone rubber is widely used in aerospace because of its durability, heat resistance, and flexibility. It can handle extreme temperatures, both high and low, and maintain its integrity over time.

Aerospace engineers must consider materials that perform well under pressure, heat, and environmental exposure. Silicone rubber’s ability to thrive in such harsh conditions makes it indispensable.

What rubber is used in space?

When it comes to space applications, the environment is unforgiving. Extreme temperatures, vacuum, and radiation levels challenge any material. So, which rubber is up to the task?

Space-grade rubber includes materials like silicone rubber¹, fluorosilicone², and EPDM³. These rubbers can endure the vacuum of space, temperature extremes, and UV radiation.

Silicone rubber is often the material of choice in aerospace due to its remarkable temperature stability. Unlike other rubbers, silicone maintains its flexibility and strength even in the vacuum of space or under extreme temperature fluctuations. Fluorosilicone, a variant of silicone, is used in more specialized aerospace components like fuel systems due to its resistance to fuels and oils. EPDM, on the other hand, is commonly used for sealing systems on spacecraft and satellites because of its ozone and weather resistance.

Which is better, EPDM or silicone?

When choosing between EPDM³ and silicone rubber, it's essential to consider the specific application. What makes one better than the other in certain scenarios?

Silicone rubber is better for high temperature and flexibility, while EPDM excels in outdoor applications and ozone resistance.

"silicone rubber vs EPDM"

Silicone rubber's ability to maintain elasticity across a wide range of temperatures makes it a top choice for aerospace applications. On the other hand, EPDM is well-suited for sealing and gasketing, particularly in situations where ozone, UV, and weather resistance are key. For example, while silicone works best for thermal and electrical insulation, EPDM is more common for sealing in spacecraft or satellites exposed to various weather conditions.

Why silicone rubber is often preferred in aerospace

Silicone rubber provides higher performance in extreme temperatures and flexibility. It is more stable when exposed to harsh environmental factors like radiation or extreme heat. As aerospace components must maintain their integrity under such conditions, silicone rubber’s reliability makes it the preferred material.

Is silicone rubber UV resistant?

Silicone rubber’s resistance to UV radiation is one of its key features. But how does it stand up to prolonged exposure to sunlight and other forms of radiation?

Yes, silicone rubber is highly UV resistant⁴ and does not degrade or lose its properties over time when exposed to sunlight.

"silicone rubber ideal for aerospace applications"

This makes silicone rubber ideal for aerospace applications where parts may be exposed to the sun’s rays for long durations, such as satellites in orbit. Unlike many other materials that break down or lose their mechanical properties, silicone remains stable even under intense UV radiation. Its non-reactive properties also make it suitable for sensitive aerospace components, such as seals and gaskets.

What is the difference between rubber and silicone rubber?

While all silicone rubber is technically a type of rubber, it has distinct differences that make it stand out in critical applications.

Silicone rubber is made from synthetic polymer chains, which makes it different from natural rubber. It offers better temperature resistance, chemical stability, and UV resistance.

Natural rubber, derived from rubber trees, is more elastic but less durable when exposed to high temperatures, chemicals, or UV rays. Silicone rubber, on the other hand, is synthetic and engineered to resist such challenges. Its molecular structure gives it higher resistance to heat, cold, and chemicals, making it ideal for aerospace, medical, and industrial uses.

Why silicone instead of plastic?

In the aerospace industry, the choice between silicone rubber and plastic is often about performance under extreme conditions. Why choose silicone over plastic?

Silicone offers superior flexibility, heat resistance, and durability in extreme conditions compared to plastic.

Plastic materials tend to become brittle at high temperatures, while silicone maintains its elasticity. Silicone also performs better at both ends of the temperature spectrum. Its ability to withstand extreme cold and heat, along with its resistance to degradation from UV radiation, makes it a clear choice over plastic in many aerospace applications. Plastics, although lightweight, often fail to meet the long-term durability requirements needed for aerospace components.

How long does silicone rubber last?

One of the most important considerations when selecting materials for aerospace applications is longevity. How long can silicone rubber endure in such demanding environments?

Silicone rubber can last for many years in aerospace applications, often outlasting other materials like natural rubber or plastics.

Silicone rubber’s resistance to environmental stress, high temperatures, and UV radiation significantly extends its lifespan. In some cases, aerospace components made from silicone can last for decades with minimal degradation, making it an investment in long-term reliability. This is crucial for components like seals and gaskets, which must maintain their performance over extended periods.

Conclusion

Silicone rubber's ability to withstand extreme conditions, from high heat to UV exposure, makes it a valuable material in aerospace applications. Its flexibility, durability, and long lifespan ensure that it remains a top choice for engineers in the aerospace industry.