PET (Polyethylene Terephthalate) film is a versatile and widely used material known for its excellent mechanical, thermal, and chemical properties. It is a type of polyester film that is biaxially oriented to enhance its strength, durability, and clarity. Below are some key parameters and common applications of PET film:

Key Parameters of PET Film:

1. Temperature Resistance:

   • PET film can withstand a wide range of temperatures, typically from -70°C to 150°C (-94°F to 302°F).

   • It has a melting point of approximately 250°C (482°F), making it suitable for applications requiring moderate heat resistance.

2. Pressure Resistance:

   • PET film exhibits high tensile strength, often ranging from 150 to 300 MPa, depending on the grade and thickness.

   • It maintains structural integrity under moderate pressure, making it ideal for laminating and packaging applications.

3. Tear Resistance:

   • PET film is highly resistant to tearing, with a tear strength of about 10-20 N/mm.

   • Its biaxial orientation provides excellent dimensional stability and resistance to punctures.

4. Chemical Resistance:

   • PET film is resistant to many chemicals, including oils, greases, and mild acids, making it suitable for harsh environments.

   • However, it is susceptible to strong acids and bases.

5. Optical Clarity:

   • PET film offers high transparency, with a light transmission rate of over 90%, making it ideal for optical and display applications.

6. Thickness:

   • PET film is available in a range of thicknesses, typically from 12 microns to 350 microns, depending on the application.

7. Surface Properties:

   • It can be coated or treated to enhance properties such as adhesion, printability, or barrier performance.

Common Applications of PET Film:

1. Packaging:

   • PET film is widely used in food packaging (e.g., snack bags, beverage bottles) due to its excellent barrier properties against moisture and gases.

   • It is also used for blister packs, lidding films, and shrink sleeves.

2. Electrical Insulation:

   • PET film is a popular choice for insulating materials in capacitors, transformers, and cables due to its dielectric strength and thermal stability.

3. Graphic Arts and Printing:

   • Its high clarity and printability make PET film ideal for applications like posters, labels, and overlays.

4. Solar Panels:

   • PET film is used as a backsheet in photovoltaic modules due to its durability, UV resistance, and electrical insulation properties.

5. Membranes and Separation:

   • PET film is used in filtration systems and separation technologies, such as water purification and battery separators.

6. Industrial Laminates:

   • It is commonly laminated with other materials to create durable surfaces for products like nameplates, control panels, and decorative finishes.

7. Optical Displays:

   • PET film is used in touchscreens, LCDs, and light guides due to its transparency and scratch resistance.

8. Medical Applications:

   • PET film is used in medical packaging, diagnostic devices, and X-ray films because of its biocompatibility and sterility.

Advantages of PET Film:

• Lightweight yet strong

• Excellent barrier properties

• Recyclable and environmentally friendly

• Cost-effective for high-volume production

In summary, PET film is a highly adaptable material with a balance of thermal, mechanical, and optical properties, making it indispensable across various industries.