How Specific Gravity and Density Affect Yield, Weight, and Cost in Polyester Film Applications
Product Overview
When specifying materials for packaging, electronics, or industrial converting, understanding the physical properties of your substrate is critical. BOPET Film Density (also referred to as specific gravity) is a fundamental metric that dictates the weight, yield, and overall cost of your final product. Whether you are calculating shipping weights, designing lightweight components, or estimating how many square meters a single roll will cover, knowing the exact density of BOPET film is essential for accurate engineering and purchasing decisions.
Technical Characteristics: BOPET Film Density
The density of standard BOPET (Biaxially Oriented Polyethylene Terephthalate) film is typically around 1.4 grams per cubic centimeter (g/cm³).
Because the density is constant regardless of the film’s thickness, you can use it to calculate the precise weight or yield of any BOPET roll. The formula for calculating weight is: Length times Width times Thickness times Density equals Weight.
Key density and physical parameters include:
- Density (Specific Gravity): ~1.4 g/cm³
- Melting Point: 255°C to 260°C
- Glass Transition Temperature: ~78°C
- Thickness Range: 12 μm up to 500 μm
- Tensile Strength: MD 133 to 271 MPa
Key Properties Related to Density
- Consistent Yield: Because the density is stable, a 1 kg roll of film will always yield the same surface area for a given thickness.
- Lightweight: At 1.4 g/cm³, BOPET is relatively lightweight, making it ideal for packaging and transportation.
- High Strength-to-Weight Ratio: The biaxial orientation process makes the film very strong despite its relatively low density.
- Predictable Handling: Knowing the density helps converters set precise tension and winding parameters.
Applications in Engineering and Design
Understanding BOPET Film Density is crucial for packaging engineers calculating material costs, for electronics designers estimating the weight of flexible circuits (FPC), and for logistics teams planning freight. It is also used in the production of magnetic tapes, release liners, and solar cell backsheets where precise weight distribution is required.
Why Choose Jinlu Film as Your Supplier
Jinlu Film is a leading BOPET Film Manufacturer and Factory with strict control over the production process. Our film maintains a consistent density and specific gravity, ensuring your weight and yield calculations are always accurate. We provide full technical data sheets with every shipment. If you need precise data for your Polyester Film Weight Calculation, request our technical guide or a sample today.
Contact us today for a factory quote, technical data, or a sample of BOPET Film.
