What Is The Difference Between PET Film And Polyester Film?

Aug 29 , 2023

When it comes to the world of films and plastics, terms like PET film and polyester film are often used interchangeably. However, they're not quite the same thing. Both materials have distinct features and uses that make them useful in a variety of sectors. In this article, we will explore the differences between PET film and polyester film.

Composition And Structure

PET Film: Polyethylene Terephthalate (PET) is a type of thermoplastic polymer that is synthesized from terephthalic acid and ethylene glycol. The resulting PET resin is then processed into PET film through extrusion. During extrusion, the PET resin is heated and stretched into a thin sheet, which aligns the polymer chains and gives the film exceptional strength and dimensional stability.

Polyester Film: Polyester is a category of polymers that share a common ester functional group in their main chain. Other polyesters besides PET are PBT (Polybutylene Terephthalate) and PCT (Polycyclohexylene Dimethylene Terephthalate). PET film is a specific member of the polyester film family, with its own unique characteristics.

Pet Film

Pet Film


PET Film: PET film boasts a range of exceptional properties that contribute to its versatility. It exhibits high tensile strength, meaning it can withstand substantial mechanical stress without tearing or breaking. This property makes it suitable for applications where durability is crucial. PET film is also chemically resistant, ensuring that it remains stable when exposed to a variety of contaminants. It is valuable in electronics and packaging due to its electrical insulating qualities. Furthermore, PET film's ability to preserve structural integrity throughout a large temperature range, enhances its application possibilities.

Polyester Film: Polyester films, including PET film, share similar properties, but the extent of these properties might differ based on the specific type of polyester. For instance, PBT films might have even higher heat resistance, making them ideal for automotive applications.  PCT films may have distinct properties that meet certain high-performance requirements.

Colored Pet Film

Colored Pet Film


PET Film: The outstanding properties of PET film make it a staple in numerous industries. In the packaging sector, PET film is frequently employed to create flexible packaging materials, blister packs, and food containers. Its barrier characteristics protect the contents from moisture and gases, extending the shelf life of the product. In electronics, PET film serves as a substrate for flexible circuits, touchscreens, and display components due to its electrical insulation capabilities. Because of its light transmittance and endurance, it is also employed in the solar sector.

Polyester Film: While PET film is the most widely recognized member of the polyester film family, other types find specialized roles. For example, PBT films are used in electronics for connectors, switches, and automotive parts due to their heat resistance. PCT films might be used in applications requiring specific thermal and mechanical qualities.

Decorative Pet Film

Decorative Pet Film

Clarity And Transparency

PET Film: PET film's outstanding clarity and transparency are not only due to its molecular structure but also to the manufacturing process that ensures uniformity and minimal defects. Because PET is amorphous, light passes through it with minimum scattering, resulting in a coating that is almost invisible when in direct contact with surfaces.

Polyester Film: Polyester films, including PET film, inherit the superior clarity and transparency characteristic of the polyester family. This quality makes them highly desirable for a wide range of applications that necessitate optical precision. However, PET film remains the leading choice for applications requiring great clarity.


PET film is a specific type of polyester film, and the terms are often used interchangeably due to the prevalence of PET in the polyester film category. Both materials have great characteristics and have several uses in a variety of sectors.  HANTAI is a leading PET film supplier in China, offering various interior decoration films. If you are interested in it, browse our website for more product details!

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