What Is BOPET/PETG Sealing Film?
BOPET/PETG sealing film, also known as BOPET/PETG lidding film or polyester lock-seal film, is a laminated tray-lidding material that combines a biaxially oriented PET outer layer with a PETG heat-seal layer.
The BOPET layer provides tensile strength, transparency, gloss, dimensional stability and a printable surface. The PETG layer acts as the tray-contact sealant and develops a strong bond when controlled heat, pressure and dwell time are applied.
HSQY's current standard BOPET/PETG lidding film is designed primarily as a lock-seal film for compatible PET and PETG packaging surfaces. It is intended for applications that prioritize package integrity, leakage resistance and distribution security rather than easy manual peeling.
Compatibility must be verified with the actual tray, food product and sealing machine. The film should not be assumed to seal every APET, rPET, CPET, PP, PE or PS tray without testing.
How Is BOPET/PETG Lidding Film Structured?
| Film Component | Main Function | Packaging Benefit |
| BOPET Outer Layer | Mechanical and printable layer | Provides strength, clarity, stiffness, gloss, dimensional stability and printability |
| Printing Ink | Optional branding and information layer | Supports logos, product information, barcodes, QR codes and handling instructions |
| Lamination Adhesive | Bonds the BOPET and PETG layers | Maintains laminate integrity during winding, sealing, storage and transportation |
| PETG Sealant Layer | Tray-contact heat-seal layer | Develops a strong lock seal against a compatible PET or PETG packaging surface |
| Optional Anti-Fog Treatment | Changes the wetting behavior of condensed moisture | Helps reduce visible water droplets in selected chilled-food applications |
The lamination adhesive, PETG formulation, printing ink and optional functional treatment must be selected according to the intended food-contact conditions and storage process.
BOPET/PETG Lidding Film Specifications
The following table summarizes the current HSQY standard lock-seal BOPET/PETG lidding-film range. Final values must be confirmed for the exact order.
| Product Name | BOPET/PETG Lock-Seal Tray Lidding Film |
| Film Structure | BOPET/PETG laminated film |
| Seal Type | Lock seal or strong permanent seal |
| Reference Thickness | Approximately 0.052–0.09 mm, or 52–90 μm |
| Roll Width Range | Approximately 150–900 mm, with custom slitting available |
| Selected Widths | 180 mm, 320 mm, 400 mm, 640 mm and custom widths |
| Reference Roll Length | Approximately 500 m, with custom lengths available |
| Core Diameter | Customized according to the tray sealing machine |
| Color | Clear or custom printed |
| Reference Density | Approximately 1.36 g/cm³ |
| Anti-Fog Option | Optional and subject to custom confirmation |
| Standard Microwave Rating | No |
| Standard Oven Rating | No |
| Standard Freezer Rating | No |
| Packaging Equipment | Manual, semi-automatic and automatic tray sealing machines after testing |
| Typical Applications | Compatible PET and PETG food trays requiring a strong, non-easy-peel closure |
| Reference MOQ | Approximately 1,000 kg per specification |
| Reference Lead Time | Approximately 10–15 days after deposit and specification confirmation |
| Payment Terms | Reference terms: 30% deposit and 70% balance before shipment |
| Delivery Terms | FOB, CIF or EXW |
The specifications above apply to the current standard lock-seal product. Easy-peel, freezer-grade, microwave-grade, ovenable and high-barrier applications require separate film structures and validation.
Key Benefits of BOPET/PETG Lock-Seal Film
Strong lock-seal performance: Designed to create a firm bond to compatible PET or PETG sealing surfaces.
High package integrity: Suitable for packages where leakage resistance and transport stability are priorities.
High transparency: Clear BOPET and PETG layers support product visibility and retail presentation.
Glossy appearance: The polyester outer surface provides a clean and premium packaging appearance.
Dimensional stability: BOPET helps control film deformation during tray sealing.
Mechanical strength: The laminate provides useful tensile and puncture resistance for general tray packaging.
Printable surface: Branding, product information and registration marks can be added.
Custom roll dimensions: Width, length, core size and winding direction can be matched to the equipment.
Automatic-line compatibility: Roll construction can be developed for stable feeding on industrial tray sealing machines.
Optional anti-fog treatment: Available for selected chilled-food projects after testing.
What Is a Lock-Seal Lidding Film?
Lock-seal film forms a strong or substantially non-peelable bond between the lidding film and tray flange.
It is selected when the package requires greater resistance to accidental opening, leakage, vibration, stacking and transportation.
Lock-seal packaging may require the user to cut, puncture or tear the film to access the product. It should not be marketed as easy peel unless a separate easy-peel sealant formulation has been developed and tested.
| Comparison | Lock Seal | Easy Peel |
| Seal Strength | Strong or substantially permanent | Controlled for manual opening |
| Opening Method | Cutting, piercing or forceful tearing may be required | Progressive peeling from a peel tab |
| Main Advantage | Package security and leakage resistance | Consumer convenience |
| Typical Use | Transport-sensitive, liquid-rich or tamper-evident packages | Retail portions, salads, desserts and convenience food |
Customers requiring controlled consumer opening should review HSQY's easy-peel sealing-film range.
Compatible Tray Materials
The PETG sealant layer is intended primarily for compatible polyester-based packaging surfaces. Actual performance depends on the tray resin, recycled content, surface treatment, flange condition and sealing parameters.
| Tray Type | Compatibility Guidance |
| PETG Tray | Primary candidate for testing with the PETG sealant layer |
| APET Tray | May provide a strong direct seal after film, tray and temperature validation |
| rPET Tray | Must be tested because recycled content, intrinsic viscosity and surface condition can affect adhesion |
| CPET Tray | Seal compatibility may be possible, but the current standard film is not microwaveable, ovenable or freezer-rated |
| PET/PE Tray | A PETG layer may not be the correct sealant for a PE flange; PET/PE lidding film is generally more appropriate |
| PP Tray | Standard compatibility should not be assumed; use a PP-compatible sealant structure |
| PS or HIPS Tray | Requires a dedicated PS-compatible heat-seal layer |
| Paperboard or Fiber Tray | Compatibility depends on the coating or liner applied to the paperboard flange |
Physical tray samples should be supplied before a commercial order is confirmed.
Applications of BOPET/PETG Lock-Seal Film
Chilled Prepared Food
The film can be evaluated for chilled prepared foods packed in compatible PET or PETG trays where a strong closure is required.
Bakery and Dessert Packaging
Clear or printed film can be used for cakes, pastries, puddings, confectionery and desserts that require product visibility and secure tray closure.
Dairy Product Packaging
Applications may include cheese portions, dairy desserts and other chilled dairy foods packed in a compatible polyester tray.
Fresh Produce and Salad Packaging
Transparent film can improve product display for salads, fruit and vegetables. However, respiring produce may require perforation or controlled gas transmission.
Liquid-Rich and Transport-Sensitive Products
Lock-seal film may be selected when resistance to accidental opening, vibration and package leakage is more important than easy consumer peeling.
Non-Food Packaging
Non-food industrial or consumer-product applications may be evaluated separately when the tray material, chemical exposure and sealing conditions have been defined.
Medical-device packaging should not be promoted under this standard food-film specification without separate sterilization, cleanliness, validation and regulatory documentation.
Is BOPET/PETG Film a High-Barrier Film?
Standard BOPET/PETG lock-seal film should not automatically be classified as a high-barrier MAP film.
BOPET provides useful aroma and gas resistance for general packaging, but oxygen-sensitive food or modified atmosphere packaging may require a dedicated barrier layer.
High-barrier options may use:
EVOH barrier layers
Transparent AlOx or SiOx coatings
Special oxygen-barrier coatings
Metallized PET
Additional high-barrier laminates
MAP projects should specify the required oxygen transmission rate, water-vapor transmission rate, gas mixture, tray barrier and target shelf life.
Customers requiring EVOH-based barrier performance can review HSQY's high-barrier PET/PE sealing-film range.
Anti-Fog Options
Anti-fog treatment is optional for the current BOPET/PETG product and must be confirmed as part of a customized specification.
Anti-fog treatment changes the way condensed moisture spreads across the food-facing film surface. It reduces visible droplets but does not remove water from the package or prevent condensation.
Performance depends on:
For dedicated easy-peel and lock-seal anti-fog structures, review HSQY's anti-fog PET/PE sealing films.
Microwave, Oven and Freezer Use
Can the Standard BOPET/PETG Film Be Microwaved?
No. The current standard HSQY BOPET/PETG lock-seal film is not specified as microwaveable.
Microwave applications require a separate film structure validated with the actual tray, food, microwave power, heating time and steam-release instructions.
Can the Standard Film Be Used in a Conventional Oven?
No. The current standard product is not ovenable.
Conventional-oven applications require a dedicated ovenable polyester film and a compatible tray such as a validated CPET packaging system.
Can the Standard Film Be Used for Frozen Food?
The current standard product is not specified as freezer-safe.
Frozen-food packaging requires a separately validated film with suitable low-temperature flexibility, seal integrity, impact resistance and laminate-bond performance.
Tray Sealing Machine Compatibility
BOPET/PETG rollstock film can be used on manual, semi-automatic and fully automatic tray sealers when the film dimensions and sealing characteristics match the machine.
Buyers should provide:
Machine manufacturer and model
Tray mold and cavity layout
Required film width
Core inside diameter
Maximum roll outside diameter
Maximum roll weight
PETG sealing side wound inside or outside
Film unwind direction
Sealing temperature range
Sealing pressure
Dwell time
Production speed
Film-cutting method
Registration-mark position for printed film
HSQY also supplies food tray sealing machines for standard atmospheric sealing and selected MAP applications.
How to Establish the Correct Sealing Window
The sealing window is the combination of temperature, pressure and dwell time that produces a continuous lock seal without damaging the film or tray.
Production testing should evaluate:
Minimum seal-initiation temperature
Maximum temperature before film or tray distortion
Required sealing pressure
Minimum effective dwell time
Hot-tack performance
Seal strength after cooling
Film tearing or cohesive failure
Resistance to limited moisture, oil or food contamination
Wrinkle and channel-leak formation
Film tracking at production speed
Tray-flange deformation
Package leakage and burst performance
Increasing the sealing temperature is not always the correct solution to a weak seal. Tray compatibility, film orientation, pressure, tool contact and flange contamination should also be checked.
Common BOPET/PETG Sealing Problems
| Problem | Possible Causes | Items to Check |
| Film Does Not Seal | Incompatible tray, reversed film, low temperature or insufficient pressure | Tray material, PETG side, temperature, pressure and dwell time |
| Seal Is Too Weak | Insufficient sealing energy, contaminated flange or poor substrate compatibility | Seal window, tray surface, flange cleanliness and film structure |
| Film Tears at the Seal Edge | Excessive seal strength, sharp cutting profile or insufficient film thickness | Seal settings, cutting knife, film gauge and tray-flange geometry |
| Tray Flange Deforms | Excessive temperature, pressure or dwell time | Sealing window, tray thickness and mold support |
| Wrinkles in the Seal | Uneven web tension, incorrect tracking, distorted trays or tool misalignment | Roll alignment, film tension, tray position and sealing-plate flatness |
| Package Leaks | Food on the flange, channel leaks, film punctures or incomplete seals | Flange cleanliness, film integrity, tray condition and complete seal continuity |
| Laminate Delamination | Inadequate adhesive cure, excessive heat or chemical exposure | Lamination bond, curing time, food composition and storage conditions |
| Poor Roll Feeding | Incorrect winding tension, telescoping, blocking or unsuitable coefficient of friction | Roll condition, storage, winding specification and machine tension |
Custom-Printed BOPET/PETG Film
BOPET provides a clear, glossy and dimensionally stable printing surface for branded tray packaging.
Custom printing can include:
Brand logos
Product names
Ingredient and nutritional information
Storage and opening instructions
Barcodes and QR codes
Registration marks for automatic tray sealers
Promotional graphics
Printed-film projects normally require:
Editable artwork files
Finished film width
Print repeat length
Number of colors
Pantone or approved color references
Printing direction
Registration-mark position
Tray orientation in the sealing mold
PETG sealing side wound inside or outside
Food-contact ink and adhesive requirements
Food-Contact Compliance
Food-contact suitability depends on the exact BOPET resin, PETG layer, adhesive, anti-fog treatment, printing ink, food type, contact duration and storage conditions.
Buyers should provide:
Destination country or market
Food type
Direct food-contact conditions
Contact duration
Filling temperature
Ambient or chilled storage conditions
Printed or unprinted film requirement
Required declarations or migration testing
Restricted-substance requirements
SGS testing and ISO 9001 quality-system certification should not be treated as a universal food-contact approval for every specification. Applicable documentation must be confirmed for the exact commercial film and intended use.
Is BOPET/PETG Film Recyclable?
BOPET and PETG are both polyester-based materials, but this does not automatically make a BOPET/PETG laminate compatible with every conventional PET recycling system.
PETG is glycol-modified PET and can behave differently from standard bottle-grade PET during sorting and reprocessing.
Actual recyclability depends on:
Proportion and formulation of PETG
BOPET and PETG intrinsic viscosity
Lamination adhesive
Printing inks and coatings
Tray material
Ability to separate the lid from the tray
Food contamination
Local collection and sorting systems
Destination-market recycling guidelines
A recyclability or PET-stream compatibility claim should only be used after the complete package has passed an appropriate design-for-recycling assessment.
Customization Options
Custom total film thickness
Custom BOPET and PETG layer ratio
Custom lock-seal strength
Custom film width
Custom roll length
Custom core diameter
Custom maximum roll diameter and weight
Custom winding direction
Optional anti-fog treatment
Custom printing and registration marks
Custom gloss or matte appearance
Puncture-resistant structure
High-barrier structure as a separate development project
Custom cartons, labels and export pallets
Quality Control
Relevant quality-control items may include:
BOPET and PETG material verification
Total film thickness and tolerance
Individual layer distribution when specified
Roll width and length
Core size and outside roll diameter
Winding tension and roll alignment
Transparency, haze and gloss
Surface scratches, gels and contamination
Lamination-bond strength
Residual solvent when applicable
Seal-initiation behavior
Lock-seal strength
Leak and burst resistance
Puncture and tensile performance
Anti-fog testing when specified
Print color and registration accuracy
Food-contact documentation review
Packaging and pallet protection
Packaging, Storage and International Shipping
BOPET/PETG film rolls should be protected from dust, moisture, impact, excessive heat and roll-edge damage.
Packaging options may include:
Protective inner bags
Roll-end protectors
Individual export cartons
Batch and specification labels
Pallet stretch wrapping
Corner and edge protection
Fumigation-free export pallets
Custom shipping marks
Rolls should be stored in their original packaging in a clean and dry environment away from direct sunlight, excessive heat, high humidity and physical damage.
Why Choose HSQY as Your BOPET/PETG Film Manufacturer?
Defined lock-seal structure: The current standard product is positioned for strong sealing rather than generic easy-peel use.
Custom thickness: Film can be supplied within the current 52–90 μm reference range.
Wide roll-width range: Widths from approximately 150–900 mm can be evaluated.
Custom printing: Logos, graphics, information and registration marks can be added.
Optional anti-fog: Anti-fog treatment can be discussed for selected chilled-food projects.
Tray-and-film matching: Recommendations can be based on physical tray samples and sealing tests.
Machine compatibility support: Roll dimensions and winding direction can be matched to the tray sealer.
Trial support: Sample film or trial rolls can be discussed before mass production.
Complete packaging supply: HSQY also supplies PET trays, PET/PE trays, CPET trays and tray sealing machines.
Export service: Carton, pallet and international shipping requirements can be coordinated.
Information Required for a Quotation
To receive an accurate film recommendation and quotation, please provide:
Tray material and complete structure
Material on the tray sealing flange
Physical tray samples
Tray dimensions and flange width
Food or packed product
Filling temperature
Ambient or chilled storage conditions
Required lock-seal strength
Anti-fog requirement
Barrier or MAP requirement
Required film thickness
Film width and roll length
Core inside diameter
Maximum roll outside diameter
PETG sealing side winding direction
Tray sealing machine manufacturer and model
Current sealing temperature, pressure and dwell time
Production speed
Printed or unprinted film
Artwork and print repeat length
Required food-contact documentation
Order quantity and annual consumption
Destination country, port or delivery address
Frequently Asked Questions About BOPET/PETG Lidding Film
What is BOPET/PETG sealing film made from?
It is a laminate combining a BOPET outer layer with a PETG tray-contact heat-seal layer.
What does the BOPET layer do?
BOPET provides mechanical strength, transparency, gloss, dimensional stability and a printable outer surface.
What does the PETG layer do?
PETG functions as the heat-seal layer and forms a strong bond against compatible polyester-based tray surfaces.
Is the standard HSQY film easy peel?
No. The current standard BOPET/PETG product is a lock-seal film designed for strong package closure.
What is the difference between lock seal and easy peel?
Lock seal creates a strong or permanent closure. Easy-peel film is specifically formulated for controlled manual opening.
Can the film seal PETG trays?
PETG trays are a primary candidate, but compatibility and seal strength must still be tested using the actual tray.
Can BOPET/PETG film seal APET trays?
It may seal APET trays, but the tray resin, recycled content, surface condition and sealing window must be evaluated.
Can it seal rPET trays?
Compatibility is possible but must be tested because recycled content and surface variability can affect seal performance.
Can it seal PET/PE trays?
It may not be the correct structure when the tray flange has a PE sealing layer. PET/PE or BOPET/PE lidding film is normally more suitable for a PE surface.
Can it seal PP or PS trays?
Standard compatibility should not be assumed. PP and PS trays normally require dedicated sealant formulations.
What thicknesses are available?
The current standard range is approximately 52–90 μm, with customized thicknesses available subject to confirmation.
What roll widths are available?
The reference range is approximately 150–900 mm. Selected widths include 180 mm, 320 mm, 400 mm and 640 mm.
What is the standard roll length?
The reference roll length is approximately 500 m, with custom lengths available.
Is anti-fog treatment available?
Anti-fog treatment is optional and must be confirmed as part of a customized specification.
Is standard BOPET/PETG film high barrier?
It should not automatically be classified as high barrier. MAP applications may require an additional EVOH or other barrier structure.
Can the standard film be microwaved?
No. The current standard product is not specified as microwaveable.
Can the standard film be used in an oven?
No. A dedicated ovenable film and compatible tray are required for conventional-oven applications.
Can the standard film be used for frozen food?
The current standard product is not specified as freezer-safe. A separate freezer-grade structure must be tested.
Why does the film not seal to the tray?
Common causes include an incompatible tray surface, reversed film, insufficient heat, inadequate pressure or short dwell time.
Why does the package leak?
Leakage can result from food contamination on the flange, wrinkles, punctures, channel leaks, cracked trays or incomplete sealing.
Can the film be custom printed?
Yes. Logos, product information, barcodes, QR codes and registration marks can be printed according to approved artwork.
Is BOPET/PETG film recyclable with PET trays?
It should not automatically be described as compatible with the conventional PET recycling stream. The complete package requires a market-specific recyclability assessment.
What is the MOQ?
The current reference MOQ is approximately 1,000 kg per specification.
What is the production lead time?
The reference lead time is approximately 10–15 days after the deposit and technical specifications are confirmed.
Can I request a sample or trial roll?
Sample film or trial rolls can be discussed for tray compatibility, lock-seal strength, machine feeding and leakage testing.
Request a BOPET/PETG Lidding Film Quote
Looking for a BOPET/PETG lidding-film manufacturer, PETG sealant film supplier or lock-seal film for PET trays?
Contact HSQY to request technical recommendations, tray compatibility testing, trial rolls, custom printing, roll specifications, factory pricing and international shipping information.
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