Comparing Raw Polyester Resin to Biaxially Oriented Film and Their Industrial Uses
Product Overview
In the packaging and manufacturing industries, the terms PET and BOPET are often used interchangeably. However, they refer to different stages of the same material. Understanding the difference between BOPET vs PET is essential for engineers and buyers to select the right material for their specific application. In short, PET is the raw resin, while BOPET is the highly processed, biaxially stretched film derived from it. Both are excellent materials, but their physical properties dictate very different uses.
What is PET?
PET stands for Polyethylene Terephthalate. It is a widely used thermoplastic polymer resin. In its raw or unstretched form (often referred to as APET or CPET), it is used to make plastic bottles, food trays, and thermoformed packaging. Unstretched PET offers good clarity and durability but lacks the extreme tensile strength needed for thin films.
What is BOPET?
BOPET stands for Biaxially Oriented Polyethylene Terephthalate. It is produced by taking the amorphous PET sheet and stretching it simultaneously in both the machine direction and the transverse direction. This molecular alignment drastically changes the physical properties of the material, making it incredibly strong, optically clear, and thermally stable.
Key Differences: BOPET vs PET
- Molecular Structure: BOPET has highly aligned polymer chains due to biaxial stretching, while standard PET does not.
- Physical Strength: BOPET has a much higher tensile strength and puncture resistance, allowing it to be made into very thin films (down to 12 μm).
- Heat Resistance: BOPET has better dimensional stability at high temperatures.
- Applications: PET is mainly used for 3D shapes like bottles and trays. BOPET is used for flat applications like flexible packaging, electronics, motor insulation, and release liners.
Technical Characteristics of BOPET
The following values represent the typical capabilities of our BOPET film:
- Material: Biaxially Oriented Polyethylene Terephthalate
- Thickness Range: 12 μm up to 500 μm
- Tensile Strength: MD 133 to 271 MPa
- Thermal Shrinkage at 150°C, 30min: MD 0.9% to 1.5%
- Breakdown Voltage (Insulation Grades): up to 39.6 kV
- Certifications: RoHS, REACH, UL746B (RTI 105°C)
Why Choose Jinlu Film as Your BOPET Supplier
Jinlu Film is a leading BOPET Film Manufacturer and Factory. We specialize in the biaxial stretching process to ensure our film has optimal molecular alignment, offering superior strength compared to standard PET. If you are looking for a reliable source for BOPET Film, we provide factory-direct pricing and custom specifications.
Contact us today for a factory quote, technical data, or a sample of BOPET Film.
