Polyester Film Heat Resistance
- Material: PET / BoPET polyester film
- Common thickness: 12–250 microns
- Color options: clear, milky white, matte, black
- Surface options: plain, corona treated, coated
- Supply format: jumbo roll, slit roll, sheet, die-cut
- Main uses: insulation, laminates, labels, protection
As a polyester film heat resistance manufacturer, PET Film Supply Company supplies PET film for applications that require stable thermal performance, low shrinkage, strong mechanical properties, and reliable insulation. Heat-resistant polyester film is widely used in electrical parts, technical laminates, durable labels, and precision converting because it offers a balanced combination of dimensional stability, tensile strength, chemical resistance, and process consistency during heating, slitting, laminating, and die cutting.
Packing and Loading
Product Overview
Polyester film is chosen for heat-related applications because it performs well during both processing and end use. Technical sources repeatedly highlight its dimensional stability, dielectric strength, mechanical strength, and low thermal shrinkage compared with many general plastic films. This is why PET film is commonly used in electrical insulation, membrane structures, technical laminates, and other precision converting applications where flatness and stability matter.
Applications
- Electrical insulation for motors, transformers, and cable wrap
- Flexible printed circuits and flat cable constructions
- Membrane switches and graphic overlays
- Durable labels and industrial nameplates
- Technical laminates for converting
- Die-cut insulating parts and spacers
- Appliance and electronics inner-layer structures
- Process-support and temporary protection film uses
Benefits
- Good thermal stability for elevated-temperature processing
- Low heat shrinkage in suitable stabilized grades
- Strong tensile strength and tear resistance
- Excellent dimensional stability for accurate converting
- High electrical resistivity and dielectric strength
- Good resistance to many solvents, oils, and chemicals
- Available in multiple gauges and surface treatments
- Easy to slit, sheet, laminate, print, and die cut
What affects the heat resistance of polyester film?
Heat resistance depends on more than the polymer name alone. Grade, thickness, exposure time, shrinkage target, and service environment all affect final performance. Industrial sources distinguish standard PET from thermally stabilized and hydrolysis-resistant grades because dry heat, repeated heat cycles, and heat combined with humidity do not affect film in the same way. Technical information also publishes heat-shrinkage test data at 150°C, which shows why dimensional tolerance and thermal exposure should be reviewed together rather than reduced to one simple temperature number.
TDS Reference Table
Property Typical Data / Option Base material PET / BoPET polyester film Thickness range 12–250 μm common industrial range Color Clear, white, black, matte, specialty options Surface Plain, corona treated, coated, printable Film structure Biaxially oriented, heat-set PET film Continuous use guide Common industrial reference around 130–150°C depending on grade and use Thermal class reference Class B 130°C appears in insulation-related sources Heat shrinkage Low; lower in thermally stabilized grades Electrical behavior High dielectric strength and electrical resistivity Chemical resistance Good against many solvents and oils; strong alkalis need caution Moisture / hydrolysis Standard PET differs from hydrolysis-resistant grades Converting options Slitting, sheeting, laminating, die cutting Supply format Jumbo roll, log roll, slit roll, sheet
Performance Range
A practical way to read PET film temperature data is to separate continuous service temperature, short-term exposure temperature, and melting point. Technical references describe permanent or long-term use around 130–150°C depending on the grade, while a melting point above 260°C for its biaxially oriented polyester film family. Those values are not interchangeable. A film may tolerate a brief converting step at a higher temperature while still requiring a lower long-term operating temperature in service.
Grade Selection
The correct grade depends on the application environment. Electrical insulation applications usually focus on dielectric strength, thermal class, and thermal aging stability. Printed overlays and technical laminates place more value on flatness, surface treatment, and dimensional control after heating. In humid thermal conditions, hydrolysis resistance becomes more important than dry-heat performance alone. That is why industrial suppliers often separate standard PET, stabilized PET, and hydrolysis-resistant PET into different product families instead of treating them as one interchangeable material.
How should polyester film be evaluated for high-temperature applications?
The most reliable method is to compare the film against actual process conditions. Continuous service temperature, short-term exposure temperature, heat shrinkage after testing, thickness tolerance, and humidity exposure all influence suitability. Technical and insulation-focused sources show that PET film performs well in heat-related applications because of its balanced thermal, mechanical, and electrical properties, but they also make clear that not every grade behaves the same way in hot and humid environments. Evaluation should therefore be based on end-use conditions, not on resin name alone.
FAQ
What temperature can polyester film usually handle?
Many industrial PET film references describe long-term or continuous use around 130–150°C depending on grade and application condition.
Is polyester film suitable for electrical insulation?
Yes. Polyester film is widely used in electrical insulation because it combines high dielectric strength, dimensional stability, and good thermal performance.
Does heat-resistant PET film also resist chemicals?
In many industrial applications, yes. Polyester film is commonly described as resistant to many chemicals, oils, and solvents, but strong alkalis need caution.
What should be confirmed before mass production?
Thickness, service temperature, short-term heat exposure, shrinkage after heating, surface type, humidity exposure, and final converting format should all be confirmed before approval.
