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PET Film
Available Configurations
Properties common to all products in this list
| Thickness | Sides | Structure |
|---|---|---|
| 0.0005 mm (thin film) to 25 mm (sheet) | 10 mm × 10 mm to 1000 mm × 1000 mm | Amorphous Biaxially-oriented Semi-crystalline |
Need custom configurations? Please contact us.
Key Features
Polyethylene Terephthalate (PET) Film is one of the most versatile engineering polymer films, available in amorphous, semi-crystalline, and biaxially-oriented structures across a wide thickness range, combining excellent electrical, mechanical, optical, and chemical properties for industrial and research applications:
Three Structural Grades for Tailored Performance
Amorphous PET offers superior optical clarity and thermoformability; semi-crystalline grades provide improved thermal stability and stiffness; and biaxially-oriented PET (BOPET) delivers the highest mechanical performance with tensile strengths of 190–260 MPa and excellent dimensional stability under load and temperature — making structural grade selection as important as thickness for application-specific performance.
Excellent Dielectric Properties (17 kV/mm, >10¹⁴ Ω·cm)
Across all structures, PET film offers a dielectric strength of 17 kV/mm and volume resistivity above 10¹⁴ Ω·cm, establishing it as a standard dielectric material for capacitor layers, flexible printed circuits, and electrical insulation applications where consistent, reliable isolation is required.
Wide Service Temperature Range (115–170 °C continuous)
PET film offers continuous service capability up to 115–170 °C depending on structure, with semi-crystalline and biaxially-oriented grades providing the upper end of this range — supporting use in applications where elevated operating temperatures would degrade standard polymer films.
Low Water Absorption (0.1% over 24 hours)
With water absorption of just 0.1% over 24 hours, PET film maintains dimensional stability and electrical performance in humid environments — a critical property for display films, optical substrates, and precision manufacturing processes where moisture-induced dimensional change would compromise results.
Wide Thickness Range (0.0005 mm to 25 mm)
Available from ultra-thin 0.0005 mm capacitor dielectric films through to 25 mm rigid sheet for structural and optical applications, PET film covers the full range of engineering polymer film requirements in a single material system across multiple structural grades.
Chemical Resistance
PET film offers good resistance to dilute acids, alcohols, and oils across all structural grades, supporting its use in packaging, analytical instrumentation, and barrier performance applications where exposure to common chemical agents must not compromise film integrity or dimensions.
Industrial Applications
PET Film is used across electronics, energy, display, packaging, and research sectors where a dimensionally stable, chemically resistant polymer film in a precisely controlled structure and thickness is required:
- ✦ Flexible Printed Circuits
- Used as a substrate for flexible printed circuits where dielectric strength of 17 kV/mm, volume resistivity above 10¹⁴ Ω·cm, and the dimensional stability of biaxially-oriented grades support reliable electrical insulation and consistent patterning across flexible interconnect assemblies.
- ✦ Capacitor Dielectric Layers
- PET film is a standard dielectric material in capacitor manufacture, where consistent electrical insulation properties, low moisture uptake, and precise thickness control across ultra-thin grades ensure reliable capacitor performance in wound and stacked configurations.
- ✦ LCD Backlight & Display Protection Films
- Employed in LCD backlight assemblies and display protection films where amorphous grades offer superior optical clarity and biaxially-oriented grades provide the dimensional stability and low moisture uptake required for consistent optical performance under varying environmental conditions.
- ✦ Laminated Safety Glass Interlayers
- Used as interlayer film in laminated safety glass assemblies, where PET's combination of tensile strength, chemical resistance, and dimensional stability under load contributes to structural integrity and long-term performance in glazing applications.
- ✦ Optical Substrates
- Applied as optical substrates where the refractive properties, surface quality, and dimensional stability of PET film — particularly in amorphous and biaxially-oriented structures — support thin-film deposition, optical coating, and nanocomposite development in both research and production environments.
- ✦ High-Performance Packaging
- Used in high-performance packaging where PET's good resistance to dilute acids, alcohols, and oils, combined with low water absorption and a service temperature up to 170 °C, ensures barrier performance and structural integrity in demanding food, pharmaceutical, and industrial packaging applications.
- ✦ Research: Thin-Film, Surface Modification & Barrier Studies
- Used across thin-film deposition, surface modification, nanocomposite development, and barrier performance studies wherever a dimensionally stable, chemically resistant polymer film in a precisely controlled structure and thickness is required as a reproducible experimental substrate.
Synonyms
Material Properties
| Element | Value |
|---|---|
| Acids - concentrated | Good-Poor |
| Acids - dilute | Good |
| Alcohols | Good |
| Alkalis | Poor |
| Aromatic hydrocarbons | Good-Fair |
| Greases and Oils | Good |
| Halogenated Hydrocarbons | Good-Poor |
| Halogens | Fair-Poor |
| Ketones | Good-Fair |
| Element | Value |
|---|---|
| Coefficient of friction | 0.2-0.4 |
| Hardness - Rockwell | M94-101 |
| Poisson's ratio | 0.37-0.44 |
| Tensile modulus( GPa ) | 02-Apr |
| Izod impact strength( J m⁻¹ ) | 13-35 |
| Tensile strength( MPa ) | 80, for biax film 190-260 |
| Element | Value |
|---|---|
| Dielectric constant @1MHz | 3 |
| Dissipation factor @ 1kHz | 0.002 |
| Dielectric strength( kV mm⁻¹ ) | 17 |
| Surface resistivity( Ohm/sq ) | 10¹³ |
| Volume resistivity( Ohmcm ) | >10¹⁴ |
| Element | Value |
|---|---|
| Flammability | HB |
| Radiation resistance | Good |
| Refractive index | 1.58-1.64 |
| Resistance to Ultra-violet | Fair? |
| Limiting oxygen index( % ) | 21 |
| Water absorption - equilibrium( % ) | 0.7 |
| Water absorption - over 24 hours( % ) | 0.1 |
| Density( gcm⁻³ ) | 1.3-1.4 |
| Element | Value |
|---|---|
| Heat-deflection temperature - 0.45MPa( C ) | 115 |
| Heat-deflection temperature - 1.8MPa( C ) | 80 |
| Lower working temperature( C ) | 20 |
| Upper working temperature( C ) | 115-170 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 1200-1350 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 0.15-0.4@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 20-80 |
Tolerances
| Thickness | ±20% | |
|---|---|---|
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |