Understanding the Material Science of BOPET Film and How Its Oxygen Barrier Protects Your Products
Product Overview
When engineers ask, “What is Mylar made of?”, the answer is almost always BOPET (Biaxially Oriented Polyethylene Terephthalate). But knowing the chemical makeup is only half the story. The real magic of this material science lies in its physical performance, particularly its Oxygen Transmission Rate. In the packaging industry, the BOPET Film Oxygen Transmission Rate is a critical metric that dictates how well a product is protected from oxygen degradation.
The Science of the Oxygen Barrier
Oxygen is the enemy of many perishable goods. It causes fats to go rancid, vitamins to break down, and electronics to oxidize. BOPET film is engineered to create a highly effective barrier against oxygen. During the biaxial stretching process, the polymer chains are tightly aligned. This dense molecular structure makes it extremely difficult for oxygen molecules to pass through the film.
Why OTR Matters for Flexible Packaging
A low Oxygen Transmission Rate (OTR) is essential for extending the shelf life of food, pharmaceuticals, and sensitive medical devices.
While standard BOPET offers a good barrier on its own, it truly shines when laminated. By combining BOPET with other materials (like aluminum foil or PE), manufacturers can create a high-barrier structure that blocks almost all oxygen, ensuring product freshness for months or even years.
Mylar vs. Modern BOPET
Mylar is simply a brand name for BOPET. Today’s modern BOPET manufacturers have refined the production process. Whether you need standard packaging film or specialized high-barrier film, modern BOPET offers an OTR performance that meets the strictest global standards, often at a much more competitive price than branded alternatives.
Technical Characteristics
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%
- Barrier Properties: Excellent oxygen and moisture barrier (especially when laminated)
- Certifications: RoHS, REACH, FDA compliant grades available
Why Choose Jinlu Film as Your Supplier
Jinlu Film is a leading BOPET Film Manufacturer and Factory. We understand the critical importance of a low BOPET Film Oxygen Transmission Rate for your product’s shelf life. We provide high-barrier films that meet rigorous international standards.
Contact us today for a factory quote, technical data, or a sample of our high-barrier BOPET Film.
