Mylar emergency blanket

The Mylar emergency blanket, also called space blanket, is an essential survival item that reflects up to 90% of body heat.

About this subject

The Mylar emergency blanket is made from polyethylene terephthalate (PET) metallized with aluminum, giving it high thermal reflectivity. It can retain up to 90% of the heat radiated by the human body, preventing hypothermia in emergency situations. Its low weight, around 50 grams, and compact size allow it to be easily carried in backpacks, first-aid kits, and vehicles.

Originating from technology developed by NASA in the 1960s to thermally insulate spacecraft and astronauts' suits, the Mylar blanket was quickly adopted for civilian rescue and survival equipment. It is used by search teams, mountaineers, campers, and in natural disasters such as earthquakes and floods where emergency insulation is needed. Its silver color also serves as a visual signal for rescue teams.

Beyond emergency use, the Mylar blanket is employed in endurance sports, especially marathons and ultramarathons, to prevent body heat loss after extreme exertion. It is also used by photographers as a light reflector and for improvised thermal insulation of equipment. In construction, it can act as a vapor barrier and radiation reflector in areas with temperature fluctuations.

Despite its effectiveness, the Mylar blanket is fragile and tears easily, designed for single use. However, it can be reused a few times if handled carefully. A curiosity: its commercial name “Space Blanket” originated from NASA’s Apollo program, and since then it has become a synonym for a must-have item in any modern survival kit.

Frequently Asked Questions

What is the thermal efficiency of a Mylar blanket?

The Mylar blanket reflects up to 90% of radiated body heat, making it effective in preventing mild to moderate hypothermia in emergencies.

Can a Mylar blanket be reused?

Although designed for single use, it can be reused a few times with careful handling, as the material is fragile and prone to tearing.

In which situations is the Mylar blanket most useful?

It is useful in first aid, camping, natural disasters, marathons, and as a signal or improvised reflector. It is also common in vehicle survival kits.