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Mylar / PET Film Explained: A Practical Guide
Published on March 12, 2026
Mylar is a high performance polyester film also known as PET or BoPET, which stands for polyethylene terephthalate. It’s a thin yet flexible plastic film which is famous for its exceptionally strong, stable, and moisture resistant properties. Mylar is the name that is broadly used. It’s a brand name that describes a PET film.
What is Mylar / PET film made of?
PET or Mylar is made from a stretched polyester resin into thin sheets. The stretching process is what gives the film its strength. This also increases its dimensional stability. Polyester is first melted and then formed into a flat sheet during manufacturing. It is then stretched in both the machine and transverse directions, which provides high tensile strength and chemical stability. This process is also known as biaxial orientation.
Exploring the Key Properties of PET Film
PET film is a high performance thermoplastic film that is famous in packaging for its exceptional tensile strength and more practical properties. Let's discuss the key properties of PET film:
High tensile strength.
Resistance to tearing and puncture.
Excellent printable surface.
Heat resistance.
Dimensional stability.
When this film is metallized, it provides a strong barrier against light, moisture, and oxygen. This makes it ideal for long term food storage and moisture sensitive products.
Exploring the Key Benefits of Using PET film in Mylar Bags
The following are some of the amazing benefits of using PET film in Mylar bags:
High Durability & Strength
PET film adds rigidity and puncture resistance. This helps the pouch to hold its shape and protects products during shipping and handling.
Extended Shelf Life
When this film is combined with foil or metallized layers, it becomes even stronger and provides a powerful barrier that keeps products safe from air, moisture, and light, ultimately extending the shelf life of products and maintaining freshness.
Good Appearance
PET film offers a smooth printing surface. That means brands can print high quality graphics that look sharp and professional.
Final Thoughts
PET film is known for its high strength. It’s the backbone of most Mylar bags. It provides a pouch structure that helps reduce material weight and shipping costs. It supports high quality printing and works perfectly with other packaging layers to help keep products safe from the inside. Mylar is not a plastic film. It is highly functional and is designed to make packaging stronger and more reliable.
PET film is widely used in different industries for different packaging needs. The most common industries include food, cannabis, industrial products, supplements, medication, and cosmetics. Reach out to trusted packaging suppliers, such as Print247, to create premium packaging that supports long-term business growth.
Bill ‘Hogg’ Ryan
Bill is a Houston-based packaging writer with 6 years in the industry. His hands-on career began with printing machines; he has built profound expertise in custom packaging solutions across multiple sectors, including cosmetics, food, and retail. A recognized industry contributor in the State. Bill now shares insights through writing, focusing on packaging trends and innovations. In his leisure time, he can be seen riding his favorite Stallion, ‘Tex,’ or jamming to country music.