Mylar emergency blanket

Mylar emergency blanket is an essential survival item that reflects up to 90% of body heat, preventing hypothermia in extreme conditions.

About this subject

The Mylar emergency blanket, also known as a space blanket, is made from a metallized polyester film (PET) developed by DuPont in the 1950s. Originally designed for NASA satellites and spacecraft, the material became popular among mountaineers and first responders due to its ultralight weight (around 50 grams) and ability to fold down to the size of a credit card. Its aluminized surface reflects infrared radiation, trapping body heat and reducing thermal loss through convection and conduction.

The main use of Mylar blankets is in outdoor emergencies such as mountain rescues, overnight camping, and natural disasters. They are a mandatory item in survival kits recommended by agencies like FEMA and fire departments. Besides retaining heat, they can be used as an improvised shelter against rain and wind since they are waterproof. They are also common in endurance races, where athletes use them after the event to prevent a sudden drop in body temperature.

Interestingly, the same reflective principle is applied in pet blankets and food packaging. However, the single-use version is thinner and can tear easily, which is why many survivalists recommend carrying at least two. Although generically called 'Mylar', there are various brands such as SOL, Adventure Medical Kits, and Survive Outdoors Longer. The low cost (under $10) and indefinite shelf life when stored dry make it one of the most versatile items for any emergency kit.

Frequently Asked Questions

How does a Mylar blanket work?

The blanket reflects infrared radiation emitted by the body, reducing heat loss through radiation, convection, and conduction. It can retain up to 90% of body heat, preventing hypothermia.

Can a Mylar emergency blanket be reused?

Yes, if it is not torn. However, because it is very thin, it tends to lose efficiency after first use and is best for single use. More durable models, like those made of metallized nylon, allow reuse.

Is the space blanket waterproof?

Yes, the material is waterproof. It can be used as a rain cover or ground sheet, but it is not breathable, which may cause internal condensation.