Silicon Release Film Polyester Release Film
Silicone-coated polyester (PET) release film for car wrap and PPF manufacturing. Stable release force, clean peel, high-temperature resistance. Custom widths, thicknesses, and release levels. Bulk wholesale from China manufacturer — request a quote.
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Product Introduction
Silicone-coated PET release film is a biaxially oriented polyester film with a precision-applied silicone release coating on one or both sides. It serves as the protective liner in car wrapping film, paint protection film (PPF), window tint film, and other adhesive-backed automotive films - providing clean, consistent release during manufacturing, converting, and end-user installation.
The PET base film delivers the dimensional stability and thermal resistance that automotive applications demand: stable through high-temperature curing cycles, resistant to silicone migration, and dimensionally consistent under tension during coating, slitting, and lamination. The silicone coating is formulated for controlled release force - easy peel during application, yet secure enough to prevent premature delamination during storage and transit.
Supplied in master rolls, slit rolls, or sheeted formats with customizable release levels (easy, medium, tight), silicone coat weights, and PET thicknesses from 12 μm to 125 μm.
Product Features
Precision Silicone Coating
Solventless thermal-cure silicone applied with tight coat-weight control ensures consistent release force across the full roll width and length. No silicone transfer to the adhesive - critical for PPF and car wrap applications where adhesive performance directly impacts installation quality and end-user satisfaction.
High-Temperature PET Base Film
BOPET substrate rated for continuous exposure up to 150°C with short-term peaks to 180°C. Survives the thermal curing cycles used in PPF and automotive film manufacturing without shrinkage, warping, or silicone degradation.
Clean, Residue-Free Peel
Formulated for low and stable release force with minimal peel-force build-up over time. The silicone coating releases cleanly - no residue transfer to the adhesive layer that could compromise bonding performance on vehicle surfaces.
Dimensional Stability Under Tension
PET's inherent dimensional stability ensures the release liner tracks true through coating heads, slitting blades, and lamination nips. Width tolerances are maintained from core to outer wrap, reducing waste from edge misalignment.
Customizable Release Levels
Available in easy, medium, and tight release formulations to match your adhesive system and application process. Differential release (different release force on each side) available for double-sided coated films.
Technical Specifications
| Parameter | Specification | Notes |
|---|---|---|
| Base Film | BOPET (Biaxially Oriented Polyester) | Virgin resin |
| Base Film Thickness | 12–125 μm | Application-dependent |
| Coating Type | Solventless thermal-cure silicone | Single or double side |
| Release Force | Easy / Medium / Tight | Customizable; typically 5–50 g/25mm |
| Residual Adhesion | >85% | Per FINAT test methods |
| Subsequent Adhesion | Unaffected | No silicone transfer to adhesive |
| Coat Weight | 0.15–1.50 g/m² | Application-specific |
| Width | Custom - up to 1600 mm | Master rolls or slit rolls |
| Length | Custom - per roll specification | |
| Temperature Resistance | 150°C continuous / 180°C peak | PET base film limit |
| Core Size | 3 inch (76 mm) or 6 inch (152 mm) | Standard; custom on request |
| Surface | Clear / Matte | Both available |
| Certifications | RoHS, REACH | |
| Standard Packing | Suspension packing with edge protection + pallet | Export-grade |
| MOQ | 200 kg | Smaller trial quantities on request |
Applications
Car Wrap Film Release Liner
The protective backing for cast and calendered PVC car wrap films. Provides clean, controlled release during high-speed coating and converting, then enables smooth peel by vehicle wrap installers during application. Compatible with air-release adhesive channel structures.
Paint Protection Film (PPF) Liner
Serves as the carrier liner for thermoplastic polyurethane (TPU) paint protection films. Withstands the thermal curing cycles used in PPF manufacturing while maintaining stable release properties. Clean peel is essential - any silicone residue compromises the optically clear adhesive layer.
Automotive Window Tint Liner
Protective liner for dyed, metalized, and ceramic window tint films. The PET release film's dimensional stability ensures consistent lamination with the tint substrate, while the silicone coating delivers the easy-release performance installers expect.
Graphic & Decal Film Liner
Release liner for automotive-grade cast vinyl graphics, racing stripes, and decorative decal films. Clean silicone release without adhesive contamination ensures flawless application on vehicle surfaces.
Industrial Tape & Adhesive Liner
Silicone-coated PET release film for double-sided acrylic foam tapes, transfer adhesives, and specialty bonding tapes used in automotive assembly. Available in differential release configurations for two-liner tape constructions.
Release Level Selection Guide
| Release Level | Typical Release Force | Recommended Application |
|---|---|---|
| Easy (Premium) | 5–15 g/25mm | Thin films, delicate adhesives, high-speed application |
| Medium (Standard) | 15–35 g/25mm | General-purpose car wrap and PPF liners |
| Tight | 35–50 g/25mm | Heavy-gauge films, aggressive adhesives, long-term storage |
Quality Assurance
Coating Process Control
Solventless silicone coating applied via multi-roll precision coating heads with in-line coat-weight monitoring. Real-time adjustment maintains target coat weight across the full web width.
Batch Release Testing
Each production batch is tested for:
Release force (FINAT FTM 3 / 4 - 180° peel at 300 mm/min)
Residual adhesion (FINAT FTM 11)
Coat weight (XRF analysis)
Visual inspection for coating defects (gels, skips, fisheyes)
Cleanroom Production
Coating performed in controlled-environment conditions to minimize particulate contamination - essential for optically clear PPF and window film applications where liner defects transfer to the adhesive layer.
Packing:
Packaging: Paper Wrapping Protection paper, PET Strapping,
Shipped on Pallet as customer request
FAQ
Q: What is the difference between silicone release film and the car wrap itself?
A: The silicone release film is the protective liner - the backing sheet that covers the adhesive side of a car wrap or PPF during manufacturing, storage, and transport. It is peeled off and discarded immediately before the wrap is applied to the vehicle. We supply the release liner, not the finished car wrap film.
Q: Can you match a specific release force for our adhesive system?
A: Yes. Provide your target release force range (e.g., 8–12 g/25mm) and adhesive type, and we will formulate the silicone coating to match. We recommend sending a sample of your adhesive for coating trials.
Q: What thickness of PET release film should I use?
A: It depends on your application. For thin PPF and window tint (23–36 μm PET), we recommend 23–36 μm PET base. For car wrap films requiring more handling rigidity, 50–75 μm is standard. For heavy-gauge industrial tapes, 100–125 μm provides the stiffness needed for high-speed die-cutting.
Q: Do you offer differential release coating?
A: Yes. Differential release - where each side of the PET film has a different release force - is available for double-sided coated applications such as transfer tapes and two-liner adhesive constructions.
Q: What is your minimum order quantity?
A: 200 kg for standard specifications. Trial quantities for new projects and sample rolls for evaluation are available on request.
Q: How do you ensure no silicone transfer to the adhesive?
A: Our solventless thermal-cure silicone system, combined with controlled curing conditions, ensures complete cross-linking of the silicone polymer. We verify this through residual adhesion testing (>85% retention per FINAT FTM 11) on every production batch.
Q: Can you convert to slit rolls or sheets?
A: Yes. We supply master rolls (full-width), precision slit rolls to your specified width, and sheeted formats. Core sizes: 3-inch (76 mm) or 6-inch (152 mm) standard.
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