Mylar emergency blanket

The Mylar emergency blanket is a survival kit essential, made of metallized polyester that reflects up to 90% of body heat.

About this subject

The Mylar emergency blanket, also known as a space blanket, is made from a polyester polymer called BoPET (biaxially oriented polyethylene terephthalate), developed by DuPont in the 1950s. Its aluminum-metallized surface reflects thermal radiation, reducing heat loss through radiation, convection, and evaporation. This makes it widely used in first aid kits, mountain expeditions, and emergency situations.

The thermal efficiency of Mylar is remarkable: a single layer can retain up to 90% of body heat, preventing hypothermia in harsh conditions. The blanket is extremely lightweight (about 50 grams) and compact, folding into a small size. Besides survival use, the material is also employed in weather balloons, satellite insulation, and food packaging due to its moisture and gas barrier properties.

A historical curiosity: Mylar was first used in space in 1960 on the Echo I satellite as a reflective coating. Later, NASA popularized thermal blankets for astronaut crews. Today, the blanket is a mandatory item in many emergency kits recommended by civil defense agencies.

Although disposable, Mylar can be reused a few times if handled carefully. It is not breathable, which can cause moisture buildup if used for long periods. Therefore, in rescue situations, it is often combined with other insulation layers. Its versatility and low cost make it one of the most popular items in the survival world.

Frequently Asked Questions

What is the purpose of a Mylar emergency blanket?

It is used to retain body heat in emergency situations, preventing hypothermia. It also serves as a thermal insulator, wind and moisture barrier, and signaling device due to its shiny silver color.

Can a Mylar blanket be washed?

It is not recommended. The metallized coating may peel off with washing. Ideally, it should be used once and discarded, but it can be wiped clean with a damp cloth if reused carefully.

How should I properly use a Mylar thermal blanket?

Wrap your body with the silver side facing inward (to reflect heat). Avoid pulling too tight to prevent tearing. In hypothermia cases, combine with dry clothing layers and keep the head covered.