Mylar emergency blanket

The Mylar emergency blanket is a vital survival item, reflecting up to 90% of body heat to prevent hypothermia.

About this subject

The Mylar emergency blanket, also known as a space blanket or thermal blanket, is made from a polyester film (BoPET) coated with vaporized aluminum. This combination ensures high reflectivity and low thermal conductivity, allowing the body to retain radiated heat. It was developed by NASA in the 1960s for space missions, protecting equipment and astronauts from extreme temperatures.

Today, it is a mandatory item in emergency kits, hiking backpacks, and first aid supplies. Beyond heat retention, the blanket can be used as a signaling device (due to its shine), as covering for improvised shelters, or as protection against wind and rain. It is extremely lightweight (about 50 grams) and compact when folded, taking up minimal space.

Interestingly, Mylar is the same material used in metallic balloons and freeze-dried food packaging. Although fragile, tearing easily, its durability is sufficient for short-term emergency use. In survival situations, heat loss through radiation is critical; the blanket drastically reduces this loss, even when wet.

Frequently Asked Questions

How to properly use a Mylar emergency blanket?

Wrap the body with the shiny side inward (to retain heat) or outward (to reflect sunlight). Avoid tearing and keep dry for maximum efficiency.

Can a Mylar blanket be reused?

Yes, with care. Fold it gently to avoid tears. However, after heavy use or exposure to dirt, replacement is recommended.

What is the difference between a Mylar blanket and a regular blanket?

Mylar is waterproof, reflects radiant heat, and is much lighter, making it ideal for emergencies. Regular blankets retain heat through insulation but do not reflect.