| Material Definition | PET film is a biaxially oriented film made from polyethylene terephthalate, a thermoplastic polyester. | Transparent, translucent, matte, white, colored, metallized, or coated grades | The base polymer and orientation process determine strength, dimensional stability, clarity, and end-use suitability. | Technical data sheet, resin specification, and certificate of analysis |
| Film Thickness | Thickness affects stiffness, tear resistance, electrical insulation, barrier performance, and material consumption. | Approximately 1.5–350 micrometres for many industrial and packaging applications | Accurate thickness control supports smooth converting, consistent roll weight, and predictable downstream performance. | Micrometer measurement; ASTM D374 or ISO 4593 |
| Mechanical Strength | Biaxial orientation provides high tensile strength and good resistance to handling and processing stresses. | Typical tensile strength is commonly around 150–250 MPa, depending on grade, direction, and test method. | Strong film reduces web breaks during slitting, printing, laminating, and high-speed packaging operations. | ASTM D882 or ISO 527-3 |
| Dimensional Stability | PET film generally has low shrinkage and good dimensional stability compared with many other flexible plastic films. | Heat-stabilized grades are available for demanding thermal processes. | Stable dimensions help maintain registration accuracy in printing, coating, electronics, and lamination. | Thermal shrinkage test at a specified temperature and dwell time |
| Optical Performance | Clear PET film offers good transparency and surface gloss; haze varies by formulation and surface treatment. | Clear, low-haze, matte, opaque white, and high-gloss options | Optical properties influence product presentation, sensor readability, printed-image quality, and display performance. | ASTM D1003 for haze and luminous transmittance; ASTM D2457 for gloss |
| Electrical Insulation | PET film provides dielectric strength, electrical insulation, and dimensional stability for many electrical applications. | Electrical-grade films with controlled thickness, surface, and cleanliness | Suitable film selection can improve insulation reliability in motors, transformers, cables, and flexible circuits. | Dielectric strength, volume resistivity, and insulation-system testing |
| Surface Treatment | Untreated PET has relatively low surface energy; coatings or corona treatment improve ink, adhesive, and coating adhesion. | Untreated, corona-treated, chemically coated, primer-coated, or antistatic grades | Correct treatment prevents delamination, poor ink anchorage, and inconsistent converting results. | Dyne-level measurement, tape test, ink adhesion, or peel-strength test |
| Barrier Capability | Standard PET provides useful moisture and gas resistance, while metallized or coated structures provide higher barrier performance. | Standard PET, coated PET, metallized PET, and laminated multilayer structures | Barrier selection affects shelf life, aroma retention, oxidation control, and packaging design. | WVTR testing and oxygen transmission testing under defined conditions |
| Temperature Performance | PET has a glass-transition temperature near 70–80°C and a melting temperature commonly near 250–260°C; actual service limits depend on grade and stress. | Standard and heat-stabilized grades for different processing conditions | Thermal data helps buyers select film for heat sealing, sterilization, coating, insulation, and high-temperature processing. | DSC, shrinkage testing, and application-specific thermal aging tests |
| Surface Friction | Coefficient of friction can be adjusted through formulation, coatings, and surface finish. | Standard-slip, low-slip, high-slip, and anti-block surfaces | Friction affects feeding, winding, stacking, pouch forming, and high-speed machine performance. | ASTM D1894 or ISO 8295 |
| Main Application Areas | PET film is used in flexible packaging, labels, graphics, electrical insulation, release liners, industrial tapes, solar components, and decorative laminates. | Packaging grade, electrical grade, printing grade, release grade, optical grade, and industrial grade | The end use determines the required thickness, treatment, clarity, cleanliness, coefficient of friction, and compliance documentation. | Application trial, converting test, and end-use performance validation |
| Food-Contact Requirements | Food-contact suitability depends on the complete film structure, additives, coatings, inks, adhesives, and destination-market regulations. | Declarations and test reports may be required for the United States, European Union, or other markets. | Compliance documents reduce customs, customer-approval, and product-liability risks. | Supplier declaration, migration testing, and applicable regional food-contact regulations |
| Recyclability Consideration | PET is a recyclable polymer, but recycling outcomes depend on collection systems, film thickness, coatings, inks, adhesives, and multilayer construction. | Mono-material PET designs, recycled-content grades, and recyclable coating options may be available. | Designing for local recycling infrastructure supports sustainability claims and regulatory compliance. | Material composition review, recycled-content certification, and local recyclability assessment |
| Quality-Control Points | Important controls include thickness profile, width, roll length, winding quality, haze, surface defects, treatment level, and splice policy. | Inspection frequency and acceptance limits should be agreed before production. | Clear specifications reduce disputes and ensure consistent performance across international shipments. | Pre-shipment inspection, sample approval, batch testing, and retained samples |
| Global Purchasing Factors | Buyers should evaluate production capacity, lead time, minimum order quantity, roll dimensions, packaging, documentation, logistics, and after-sales support. | Compare total landed cost rather than only the quoted price per kilogram or square metre. | Reliable supply, accurate documentation, and export-ready packaging are essential for international production continuity. | Supplier audit, trial order, commercial invoice, packing list, certificate of origin, and shipping records |