Are Mylar Space Blankets Actually Used in Space?

When you think of space exploration, you might envision astronauts floating in zero gravity and orbiting the Earth. However, the technology behind these spacesuits and spacecraft often has humble beginnings on Earth. One such technology is the Mylar space blanket, a versatile and effective thermal insulator that has its roots in protecting satellites. In this article, we delve into the truth behind the use of Mylar space blankets in space and debunk any misconceptions.

Origins of Mylar Film

Mylar film, a polyester film, was initially developed for use in the aerospace industry. It began as a protective layer for satellites, ensuring their integrity in the harsh conditions of space. In 1964, the term 'space blanket' was coined by scientists at the United States National Research Council (NRC). Notably, this material played a significant role in the Apollo Lunar Module (LEM) missions, serving both as a thermal insulator and a reflective layer to protect astronauts and equipment from extreme temperatures.

"The silver foil was used on the communications systems to reduce solar heating and to reflect thermal radiation from the astronauts back to them." — NASA

Use in Spacecraft and Space Suits

While it is true that something similar to Mylar space blankets is used in spacecraft, they are not in the same form that you might find in an emergency kit. Modern spacecraft and their components are designed with multiple layers of insulation, often encompassing a vacuum between each layer. This vacuum itself is an excellent insulator, further enhancing the thermal protection provided by the reflective metal coatings.

It is also worth noting that Mylar film is used in the spacesuits worn by astronauts. The reflective properties of the Mylar film help to maintain a stable internal temperature, crucial for the astronauts' well-being during extravehicular activities (EVAs). These protective layers are made using similar industrial processes to those employed in the commercial production of space blankets.

Commercial Applications and Marketing

The term 'space blanket' was a marketing success, connecting the product to the high-tech world of space exploration and capturing the public's imagination. However, these commercially available emergency blankets are not the same as those used in spacecraft. In reality, the emergency blankets you might find for sale are made with flexible and durable substrates, often utilizing a similar but less stringent manufacturing process.

Nevertheless, the core technology of reflective films and sheeting used in the commercial products is based on the same principles as those found in spacecraft. This reflects a clever marketing strategy that has allowed the public to associate the high-tech material with its practical applications in extreme environments.

Conclusion

In summary, while the Mylar space blankets you see in survival kits are not the same as those used in spacecraft, they do share the same scientific principles of thermal insulation and reflective properties. The term 'space blanket' serves as a testament to the success of clever marketing and the versatile uses of this technology.

Understanding the true applications of Mylar film in space can help to dispel any myths and provide a clearer picture of the engineering behind space exploration. Whether you're an astronaut or a casual observer, the story of Mylar and its journey from space satellites to emergency blankets is an intriguing tale of technology and innovation.