Mylar emergency blanket

The Mylar emergency blanket, also known as a space blanket, is a lightweight survival essential that reflects body heat and protects against hypothermia.

About this subject

The Mylar emergency blanket, often called a space blanket or survival blanket, is made from a metallized polyester film, a material developed by NASA in the 1960s. Originally designed for the space program, Mylar is a type of PET (polyethylene terephthalate) coated with a thin layer of aluminum. This combination reflects up to 90% of the body's radiant heat, making the blanket extremely effective at preventing hypothermia in emergency situations.

With typical dimensions of 52 by 84 inches and a weight under 2 ounces, the blanket can be easily stored in backpacks, first aid kits, or even a pocket. Besides its use in rescues and camping, it serves as a ground insulator, protection against rain and wind, and even a reflective signal for search teams. The material's versatility has also made it popular in endurance events like marathons, where it is distributed to athletes after the finish line to prevent rapid heat loss.

It is important to note that the Mylar blanket is not a substitute for robust thermal insulation in extreme temperatures. It works as a reflective barrier but has no thickness to retain heat for long periods if the user is wet or in contact with cold ground. Therefore, in survival situations, it is recommended to use it alongside other thermal protection techniques. Durability is also limited: the material tears easily if handled roughly.

Despite its limitations, the Mylar blanket is one of the cheapest and most reliable items in emergency kits worldwide. Rescue organizations like the Red Cross and scouting associations include it as a standard item. Its history tied to space exploration and its proven effectiveness make it a symbol of preparedness and accessible technology.

Frequently Asked Questions

What is the difference between a Mylar blanket and a regular blanket?

A Mylar blanket is made of metallized polyester that reflects body heat, while regular blankets trap heat through fabric insulation. Mylar is much lighter and thinner, but less durable.

Can an emergency blanket be reused?

Yes, but with caution. It can be folded and stored again if not torn or dirty. However, the material tends to lose efficiency over time and with repeated folding.

How to properly use a Mylar blanket in an emergency?

Wrap the body completely with the shiny side facing inward to reflect heat. Avoid direct skin contact to prevent moisture buildup. Also use it as a ground insulator or windbreak.