Mylar emergency blanket

Mylar emergency blanket: reflects up to 90% of body heat, essential in survival kits to prevent hypothermia.

About this subject

The Mylar emergency blanket, also known as a space blanket, is made from a thin sheet of polyester film coated with aluminum. It was originally developed by NASA in the 1960s for thermal insulation of equipment and crew during space missions. Today it is widely used in first aid and survival kits, as it takes up little space and weighs about 50 grams.

Its primary function is to retain body heat: the reflective coating reflects up to 90% of thermal radiation emitted by the body, reducing heat loss through conduction, convection, and radiation. It is a mandatory item in hiking backpacks, long-distance competitions such as marathons and ultramarathons, and vehicle emergency kits. In cold climates or disaster situations, it is commonly recommended by emergency services.

Despite its effectiveness, the Mylar blanket is fragile and can tear easily. Ideally it is single use, but it can be reused if handled carefully. There are more durable versions with fabric reinforcement. An interesting fact: the shiny blankets seen in marine rescues are larger variations of the same material, allowing helicopters to locate victims by the reflective glare.

Frequently Asked Questions

What is a Mylar blanket used for?

It is used to retain body heat in emergency situations, preventing hypothermia. It can also serve as an improvised shelter, rainwater collector, or reflective signal.

How to properly use a thermal blanket?

Wrap your body completely with the silver side facing inward (toward the skin) to reflect heat. Avoid pulling too tight to prevent tearing. In windy conditions, use as an outer cover.

Is the Mylar blanket reusable?

Theoretically yes, if handled very carefully, but due to its fragility and low cost, single use is recommended. Frequent reuse reduces reflective efficiency.