Mylar emergency blanket

Emergency thermal blanket made of metalized PET film, essential in survival kits for its ability to retain up to 90% of body heat.

About this subject

The emergency thermal blanket, also known as a space blanket, is a compact and lightweight item originally developed by NASA for the Apollo program. Made from polyester film (PET) coated with a thin layer of aluminum, it reflects up to 90% of the body's radiated heat, preventing hypothermia in critical situations.

In practice, the blanket is used in first aid, camping, and expeditions. Its standard size (about 2.1 x 1.3 m) is enough to fully cover an adult. Besides retaining heat, it is also waterproof and serves as a barrier against wind and moisture. Interestingly, the same principle is used in food packaging and coatings for space telescopes.

Although generally considered disposable, the blanket can be reused if handled carefully. However, its durability is limited: it tears easily and loses efficiency after multiple folds. Therefore, it is best kept in its original packaging until use. In survival kits, it is one of the cheapest items with the best cost-benefit ratio.

Frequently Asked Questions

How to properly use an emergency thermal blanket?

Unfold the blanket and wrap your body with the silver side facing inward, as that side reflects heat. Cover the head and torso, which lose the most heat. Avoid excessive folding to prevent damage to the metallic layer.

Can the thermal blanket be reused?

Yes, with care. Because it is fragile, it is recommended for single use only. If reused, store it without aggressive folds and check for tears. Efficiency decreases with repeated use.

What is the difference between an emergency thermal blanket and a regular blanket?

The thermal blanket is made of metalized material that reflects heat, while a regular blanket insulates by trapping air. It is much lighter, more compact, and waterproof, but less durable. It is ideal for emergencies, not daily use.