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What is the difference between Bopp and polyester film?

by:Gangyuan      2023-07-20

BOPP vs. Polyester Film: Unveiling the Key Differences and Applications in Modern Industries


In the vast world of packaging materials, two heavyweights often clash: BOPP (Biaxially Oriented Polypropylene) and Polyester (PET) film. These films play a crucial role in various modern industries, especially in packaging applications. While both offer desirable properties, each has unique features, making them suitable for distinct purposes. In this article, we will delve into their divergences, exploring their characteristics, manufacturing processes, applications, advantages, and limitations. So let's embark on an informative journey to understand the differences between BOPP and polyester film!

Manufacturing Processes:

1. BOPP Film:

Biaxially Oriented Polypropylene film is primarily manufactured through the flat-die extrusion process. This involves melting polypropylene resin and feeding it through a flat extrusion die, where it obtains a uniform thickness. The film is then stretched in both the machine and transverse directions, known as biaxial orientation, which enhances its mechanical properties.

2. Polyester Film:

Polyester film, on the other hand, is manufactured using a process known as melt-extrusion. In this method, PET resin is melted and extruded through a slot die to create a continuous sheet. This sheet is then solidified, stretched, and simultaneously cooled in a controlled manner, resulting in a biaxially oriented polyester film.

Key Differences:

1. Chemical Composition:

The most fundamental difference between BOPP and polyester film lies in their chemical composition. BOPP, as the name suggests, is derived from polypropylene, a thermoplastic polymer. In contrast, polyester film is made from a type of thermoplastic polyester called polyethylene terephthalate (PET). These varying chemical compositions lead to dissimilar physical and mechanical properties.

2. Optical Properties:

BOPP film exhibits excellent clarity and transparency, making it a preferred choice for applications that require visual presentation. Polyester film, on the other hand, possesses higher optical clarity, enabling it to provide unparalleled visibility, making it ideal for applications like window films and displays.

3. Mechanical Properties:

In terms of tensile strength, BOPP film offers good strength-to-weight ratio, making it resilient and capable of withstanding mechanical stress. Polyester film, on the other hand, exhibits exceptional tensile and impact strength. Its higher resistance to tearing, pinholing, and abrasion makes it suitable for applications that demand durability and protection.

4. Heat Resistance:

BOPP film possesses excellent heat resistance, enabling it to withstand elevated temperatures. This property makes it suitable for applications that necessitate heat sealing and heat resistance. On the contrary, polyester film showcases superior heat stability, making it suitable for applications requiring high-temperature resistance, like electronic components and photovoltaic modules.

5. Moisture Barrier Properties:

Polyester film offers a significantly higher moisture barrier compared to BOPP film. This attribute makes it a favorable choice for applications that demand moisture protection, such as food packaging, pharmaceutical packaging, and electrical insulation.


1. BOPP Film Applications:

BOPP film's excellent printability and mechanical properties have led to its widespread usage in various packaging applications, such as food packaging, labels, adhesive tapes, and wrapping films. Additionally, its heat resistance makes it an ideal choice for lamination purposes.

2. Polyester Film Applications:

Due to its remarkable mechanical properties and excellent barrier properties, polyester film finds extensive application in the packaging industry. It is utilized in applications like metalized films, flexible packaging, electrical insulation, solar panels, and various industrial applications that require exceptional strength and durability.

Advantages and Limitations:

1. Advantages of BOPP Film:

- Excellent optical properties for enhanced product visibility.

- Good mechanical properties, including tensile strength and tear resistance.

- Suitable for printing due to its surface properties.

- Heat resistance makes it suitable for applications involving heat sealing.

- Availability in various thicknesses and widths.

- Cost-effective compared to polyester film.

2. Limitations of BOPP Film:

- Lower moisture barrier compared to polyester film.

- Vulnerable to UV degradation over time.

- Limited heat resistance compared to polyester film.

3. Advantages of Polyester Film:

- Superior mechanical properties, including tensile and impact strength.

- Excellent optical clarity for improved visibility.

- Exceptional moisture barrier properties.

- High resistance to tearing, pinholing, and abrasion.

- Impervious to UV degradation.

- Outstanding heat stability.

4. Limitations of Polyester Film:

- Higher cost compared to BOPP film.

- Limited printability due to surface properties.


After diving into the world of BOPP and polyester film, it becomes evident that these two packaging materials possess distinct properties, leading to their divergence in various applications. While BOPP film excels in optical properties and cost-effectiveness, polyester film shines in its mechanical strength, moisture barrier properties, and heat stability. By understanding the differences between BOPP and polyester film, manufacturers and industries can make informed decisions, selecting the most suitable film for their specific packaging requirements.

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