In humanity's expedition to explore the vast universe, spacecraft face extreme tests unimaginable on Earth: from the blistering heat of over a thousand degrees Celsius when piercing the atmosphere, to the absolute zero of deep space; from intense cosmic radiation to the formidable lubrication challenges in a weightless environment. In this challenge to venture toward the "stars and sea," silicone oil, with its exceptionally stable molecular structure and outstanding performance across a broad temperature range, transforms into the "space armor" that escorts spacecraft.

1. The "Temperature-Controlled Blood" That Pierces Extreme Cold and Flames

In space, the sunlit side of a spacecraft can reach temperatures over 100°C, while the shaded side plunges to below -100°C. Under such extreme temperature differentials, ordinary lubricants and hydraulic fluids either boil and volatilize or freeze solid.

Specialty phenyl silicone oils or fluorosilicone oils have shattered this physical limitation. They maintain a clear liquid state and stable viscosity across an ultra-broad temperature range from -100°C to 250°C. Whether it is the joint lubrication of a spacecraft's robotic arm or the hydraulic transmission of an attitude control system, silicone oil ensures these critical components operate seamlessly amid the alternating extremes of freezing cold and blazing heat.

2. The "Radiation-Resistant Shield" Against Cosmic Rays

Beyond the Earth's magnetic field, high-energy cosmic rays and ultraviolet radiation can easily sever the chemical bonds of ordinary polymeric materials, causing them to become brittle, age, and even pulverize. The backbone of silicone oil, however, consists of exceptionally robust silicon-oxygen bonds (Si-O), whose bond energy far exceeds that of carbon-carbon bonds.

This natural molecular structure endows silicone oil with outstanding radiation resistance. In artificial satellites and deep-space probes, silicone oil-based lubricants and sealing greases can withstand prolonged bombardment by intense radiation without degrading. This ensures that spacecraft maintain superior sealing and lubrication performance throughout their service life, which can span several years or even decades.

3. The "Zero-Volatility Guardian" in Vacuum Environments

In the vacuum of space, ordinary oils are highly prone to volatilization. The resulting volatiles not only lead to lubrication failure but also condense on precision optical lenses or solar panels, causing catastrophic "contamination."

Specialty low-volatility silicone oils (such as perfluoropolyether silicone oils) possess an extremely low saturated vapor pressure, producing virtually no volatiles even under ultra-high vacuum conditions. They are widely used in the precision bearings of space cameras and the deployment mechanisms of satellite solar panels, ensuring that humanity's "eyes" exploring the universe remain perpetually bright and that all mechanical movements are flawlessly executed.


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