Is Mylar Flammable? Unveiling the Truth

Mylar, the versatile material that has found its way into various industries, from electronics to packaging, has sparked curiosity regarding its flammability.

As we dive into the topic, we will explore the properties and characteristics of Mylar, shedding light on its potential fire risks.

So, if you’ve ever wondered about the flammability of Mylar, keep reading to uncover the facts and separate myth from reality.

Is Mylar Flammable

What Is Mylar

Mylar is a brand name that has become synonymous with a type of polyester film known for its durability, transparency, and tensile strength.

“Mylar” is often used as a generic term for any polyester film, similar to how “Kleenex” refers to facial tissues.

However, Mylar is a registered trademark of DuPont Teijin Films, a company specializing in polyester films.

Is Mylar Flammable

To answer this question, let’s first dive into what Mylar is made of. Mylar is a brand name for biaxially-oriented polyethylene terephthalate (PET), a type of polyester film.

PET is a highly versatile material that combines excellent mechanical, thermal, and electrical properties. It is known for its strength, transparency, and resistance to moisture and chemicals.

Now, let’s get back to the burning question at hand. Is Mylar flammable? The short answer is that Mylar is not highly flammable. PET, the main component of Mylar, has a high ignition temperature of around 480 degrees Celsius (896 degrees Fahrenheit).

This means that it requires a significant amount of heat to ignite. In addition, Mylar has a low heat release rate and is self-extinguishing, which means it will not continue to burn once the heat source is removed.

However, it’s important to note that while Mylar is not highly flammable, it is not completely fireproof either.

Is Mylar Heat Resistant

Yes, Mylar is heat resistant to a certain extent. Polyester films like Mylar have good thermal stability and can withstand moderate temperatures without significant degradation. Mylar films typically have a melting point of around 250-260 degrees Celsius (482-500 degrees Fahrenheit).

However, it’s important to note that the exact heat resistance of Mylar can vary depending on the specific grade or thickness of the film.

Thicker Mylar films tend to have higher heat resistance compared to thinner ones. Additionally, prolonged exposure to high temperatures can cause Mylar to shrink or deform.

Are Mylar Blanket Flammable

The short answer is yes, Mylar blankets are indeed flammable. The plastic film used in manufacturing can melt and catch fire if exposed to high heat or an open flame.

However, it is essential to note that Mylar blankets are not highly flammable like gasoline or other volatile substances. They have a higher ignition temperature, requiring more heat to catch fire than materials like paper or fabric.

Despite their flammability, Mylar blankets are still considered safe for emergencies. This is because they are primarily designed as a temporary measure rather than a long-term solution.

In most emergencies, the risk of fire may be outweighed by the potential benefits of using Mylar blankets to stay warm and prevent hypothermia.

Can Mylar Start A Fire?

Mylar itself is not flammable and does not easily catch fire. It is a polyester film that has good resistance to ignition. However, it’s important to note that while Mylar may not readily ignite, it can still contribute to the spread of fire under certain conditions.

In the presence of an external ignition source, such as an open flame, intense heat, or sparks, Mylar can melt, shrink, or deform. If the ignited Mylar comes into contact with other flammable materials or combustible substances, it can potentially contribute to the fire and increase its intensity.

Are Mylar Fumes Toxic?

Mylar is generally considered safe for regular use. It is a durable and versatile material known for its excellent tensile strength and heat resistance.

Mylar is chemically inert, meaning it does not react with other substances or release harmful compounds under normal conditions.

This makes it a popular choice for food packaging and other applications where it needs to maintain its integrity and not contaminate the contents.

However, like any material, certain factors can potentially lead to the release of fumes or gases from Mylar. These factors include exposure to high temperatures or the presence of chemical solvents.

When Mylar is heated to very high temperatures, such as during the manufacturing process or in the presence of a heat source, it can release fumes that may contain chemicals. Additionally, if Mylar comes into contact with certain solvents, it may degrade and release volatile organic compounds (VOCs) into the air.

While Mylar fumes are generally not considered toxic, taking precautions to minimize exposure and ensure safety is essential.

What Is Mylar Used For

Mylar, or polyester film, is used in various applications due to its various desirable properties. Here are some common uses of Mylar:

Packaging: Mylar is commonly used for packaging materials due to its excellent barrier properties. It helps protect food, pharmaceuticals, and other products from moisture, oxygen, and light. It is often used in flexible packaging, such as pouches, bags, and wrappers.

Electrical Insulation: Mylar is widely used as an electrical insulating material. Its high dielectric strength, thermal stability, and moisture resistance make it suitable for applications like capacitors, cables, transformers, and electrical tapes.

Photography: Mylar film is used as a base material for photographic film and a protective layer for prints. It provides a smooth and stable surface and helps protect the images from damage.

Displays and Signage: Mylar creates explicit and durable display materials. It is commonly used for laminating or encapsulating posters, signs, banners, and graphics to enhance their appearance and protect them from damage.

Balloons: Mylar balloons are popular for decorations at parties and events. The film’s lightweight nature, ability to retain helium, and ability to be shaped into various designs make it well-suited for balloon manufacturing.

Insulation and Reflective Applications: Mylar films with reflective coatings are used for insulation. They reflect heat, light, and UV radiation, making them useful for insulation blankets, emergency blankets, radiant barriers, and grow room linings.

Solar Energy: Mylar films are used in solar energy applications as reflectors to increase the efficiency of solar panels and concentrators. The reflective properties of Mylar help direct and concentrate sunlight onto the solar cells or heat transfer systems.

Arts, Crafts, and DIY Projects: Mylar is often used in arts, crafts, and DIY projects due to its versatility. It can be used for stencils, creating shiny surfaces, making decorations, and other creative applications.

Is Mylar Hazardous?

Mylar itself is not considered hazardous under normal use. When handled properly, it is a non-toxic material and does not pose a significant health risk. However, like any material, certain precautions should be taken to ensure safe handling and use.

It’s important to note that Mylar is a film that can present hazards if not used appropriately or damaged. Here are a few considerations:

Fire Hazard: While Mylar is not highly flammable, it can contribute to the spread of fire if it comes into contact with an ignition source or other flammable materials. Caution should be exercised to keep Mylar from open flames or heat sources.

Sharp Edges: When handling Mylar films or sheets, be mindful of sharp edges. If the film is torn or cut improperly, it can create sharp edges that cause cuts or injuries. Handle Mylar carefully and use appropriate tools when cutting or manipulating the material.

Inhalation of Fumes: When Mylar is exposed to high heat or open flames, it can release fumes that may be irritating or potentially harmful if inhaled. Working in a well-ventilated area or using appropriate protective equipment when working with Mylar in high-temperature applications is essential.

Environmental Considerations: While Mylar itself is not considered environmentally hazardous, improper disposal of Mylar products can contribute to waste and pollution. Recycling Mylar whenever possible or disposing of it under local regulations is recommended.

Is Mylar A Good Insulator?

One of the primary reasons Mylar is considered a good insulator is its ability to resist heat transfer. Heat transfer occurs in three ways – conduction, convection, and radiation. Mylar excels in preventing all three forms of heat transfer due to its low thermal conductivity. Mylar acts as a barrier, restricting heat flow between two surfaces.

Additionally, Mylar exhibits excellent electrical insulation properties. It has a high dielectric strength, meaning it can withstand high voltages without allowing electricity to pass through. This makes Mylar an excellent choice for electrical insulation applications like cables or circuit boards.


Mylar is not highly flammable and does not readily catch fire. It is a polyester film with good resistance to ignition. However, when exposed to an external ignition source, such as an open flame or intense heat, Mylar can melt, shrink, or deform.

If ignited Mylar comes into contact with other flammable materials, it can contribute to the spread of fire. Therefore, while Mylar may not ignite easily, it can still pose a fire hazard under certain conditions.

It is important to exercise caution, keep Mylar away from ignition sources, and handle it appropriately to minimize fire risks.